ASLO 2018 Summer Meeting

Special Sessions

SS01: Oil and Water Do Mix: The fate, behavior and impact of dispersed oil droplets in the sea

Edward J. Buskey, University of Texas at Austin (ed.buskey@utexas.edu)
Kenneth Lee, Fisheries and Oceans (ken.ll@dfo-mpo.gc.ca)

Crude oil is released into oceanic waters through production, transport, offshore exploration, and natural seeps. Since the Deepwater Horizon Oil Spill there has been a significant increase in research related to marine oil spills which has improved the ability to understand and predict the fate of spilled oil, and its potential environmental and human health impacts. The use of chemical dispersants affects the size and spatial distributions of droplets in marine spills. Dispersant application on surface oil slicks or directly into subsurface oil well blowouts can create small oil droplets of various sizes down to the micron and submicron range. The broad range of sizes of droplets impact the breakdown and consumption of oil by hydrocarbon degrading bacteria, interactions of oil droplets with marine organisms, interactions with suspended particles and the formation of oily marine snow. An improved understand of these processes can be used to develop tools for assessing response options in future spills, and weighing the environmental and human health trade-offs of various oil spill remediation practices in the sea, including burns, skimming, and surface or sub-surface application of chemical dispersant.

Keywords: Contaminant, Ecosystem, Marine, Policy, Toxicology

SS02: Importance of Winter and Seasonality in Aquatic Systems

Stephen Powers, Washington State University (steve.powers@wsu.edu)
Diane McKnight, University of Colorado (diane.mcknight@colorado.edu)
Bailey McMeans, Univ of Toronto Mississauga (bailey.mcmeans@utoronto.ca)
Ted Ozersky, Univ Minnesota Duluth (tozersky@d.umn.edu)

In 1996, the National Research Council’s Committee on Inland Aquatic Ecosystems highlighted the importance of winter processes in the chapter Fundamental Research Questions in Inland Aquatic Ecosystem Science. Two questions were offered that still resonate today, especially under changing winter conditions: 1) What are the critical events and conditions that control autotrophic and heterotrophic processes during winter? 2) What critical processes may occur in winter that control the behavior of ecosystems in the subsequent summer and spring? In this session we extend these questions to all freshwater and marine systems and seek presentations on physical, chemical, and biological processes in the cold, across full seasonal cycles, and across temperature gradients. We invite contributions from a range of topics, inclusive to ice phenology, mixing dynamics, biogeochemistry, food webs, metabolism, or biology/ecology at any level (molecules to macrosystems) with the goal of understanding winter and cross-seasonal linkages in diverse systems.

Keywords: Biogeochemistry, Ecosystem, Ecology, Food Web, Marine

SS03: The Global Ecological Impact of Crustose Coralline Algae: Interactions, threats, and roles in a changing environment

Shany Gefen-Treves, Hebrew University of Jerusalem (shany.gefen@mail.huji.ac.il)
Nick Kamenos, University of Glasgow (Nick.Kamenos@glasgow.ac.uk)
Catriona Hurd, University of Tasmania (Catriona.Hurd@utas.edu.au)
Mark M. Littler and Diane S. Littler, Smithsonian Institution, Washington DC (littlerd@si.edu)
Bradley Moore, Scrips Institution, UCSD (bsmoore@ucsd.edu)

Reef builders? System stabilizers? Larvae settlement facilitators? Ecosystem engineers? Crustose Coralline Algae (CCA) have been shown to be a critical link in almost every niche along the entire depth range inhabited by photosynthetic organisms. Despite the recent growing recognition in the global importance of CCA, questions regarding their ecology, function and roles remain poorly understood. These include what limits their abundance and what interactions do they hold with key species in their natural environment? What role do they play in these interactions and what is the involvement of CCA-associated microbiomes in some of these roles? Recently developed high-throughput technologies has revolutionized biology and enabled the accumulation and analysis of vast systematic data. Comparative genomics, transcriptomics metabolite profiling and other tools have provided insights on these questions, yet a gap still remains between the amount of data generated and clarification of the underlying mechanisms in the cellular and functional levels. Recent work addressed this gap shedding light on the mechanisms and the ques involved. Presenting a selection of this work may yield a true inter-disciplinary discussion, joining under one roof of this proposed session researchers from the fields of coral-reefs, ocean acidification, marine microbiology, calcification, coastal ecology and more.

Keywords: Acidification, Ecosystem Service, Ecology, Resource, Marine, Microbial, Resilience

SS04: Ted Talks The career, contributions, and impact of Theodore J. Smayda

Tracy A. Villareal, The University of Texax at Austin (tracyv@austin.utexas.edu)
James A. Yoder, WHOI (jyoder@whoi.edu)
Edward G. Durbin, Univ. of Rhode Island (edurbin@uri.edu)

Ted Smayda’s career in marine science spanned 60 years on topics ranging from phytoplankton suspension, ecology, succession, community structure, growth rates, biogeography, and the problems of harmful algae. Through his students and colleagues, his reach extended into phytoplankton-zooplankton interactions and the structuring of planktonic ecosystems. With his passing in the spring of 2017, we invite the community to join us in a celebration of his career with contributions on any aspect of phytoplankton or oceanography that were inspired or affected by his work.

Keywords: Biogeography, Ecosystem, Ecology, Marine, Phytoplankton

SS05: Ecotones: Microbial community transition zones in aquatic systems

Federico Baltar, University of Otago (federico.baltar@otago.ac.nz)
Sergio Morales, University of Otago (sergio.morales@otago.ac.nz)

Aquatic microbiology has made great strides in defining the spatial and temporal patterns in aquatic microbial community structure and composition at large scales. However, our ability to clearly and quantitatively define niches, or different “ecosystems,” for microbial communities lags behind. Further, the identification of ecotones, or transition zones between these defined ecosystems, and ecotones impacts on microbial community structuring and ecosystem processes are poorly understood. In this session, we will explore new tools to quantitatively define ecotones in aquatic ecosystems as well as the impact of these transition zones on microbial communities. While terrestrial ecotones can be rigid, represented by slow changing boundaries between ecosystems, aquatic systems are expected to be dynamic and potentially transient. How can we detect ecotones, how dynamic are they, who responds to them, and what are the repercussion of these boundaries for ecosystem processes? This session aims to provide answers to these questions, with presenters encouraged to provide evidence for ecotones, their dynamics and their impact across a range of temporal and spatial scales, targeting the entire microbial community or specific sub-populations within it. We welcome work using any combination of culture-based techniques,-omics, evolutionary or ecological theory, and modelling.

Keywords: Bacterioplankton, Biodiversity, Biogeography, Ecosystem Service, Ecosystem, Microbial, Modeling, Phytoplankton, Population, Zooplankton

SS06: Aquatic Science: Informing Policy, Management, and the Public

Michelle McCrackin, Stockholm University (michelle.mccrackin@su.se)
Adrienne Sponberg, ASLO (sponberg@aslo.org)
Daniel Conley, Lund University (daniel.conley@geol.lu.se)
Lesley Smith, University of Colorado Boulder (lesley.smith@colorado.edu)

Bringing science to the forefront of policy discussions is important for sound decision-making and the sustainability of the world's aquatic systems. Aquatic science and research can inform policies to address some of the most challenging issues including alteration of hydrology, invasive species, fisheries management, habitat alteration, and pollution. Understanding the interaction between humans, aquatic ecosystems, and the important ecosystem services on which people rely requires a wide range of expertise, including the scientific community. Many scientists want to broaden the impact of their research, but don't know how or where to start. In this session, presenters will discuss how they've engaged with policy- and decision makers, what policy- and decision makers want to know, and what kinds of contributions scientists can make to policy development and implementation.

Keywords: Education, Sustainable, Outreach, Policy, Resilience

SS07: Cyanobacterial and Algal Metabolites: Occurrence, ecology, prediction, and management

Ted Harris, Kansas Biological Survey (t992h557@ku.edu)
Dedmer Van de Waal, Netherlands Institut (D.vandeWaal@nioo.knaw.nl)
Alan Wilson, Auburn University (aew0009@auburn.edu)
Frances Pick, University of Ottawa (Frances.Pick@uottawa.ca)
Peter Leavitt, University of Regina (peter.leavitt@uregina.ca)
Susie Wood, Cawthron Institute (Susie.wood@cawthron.org.nz)

Cyanobacterial and eukaryotic algal blooms are increasing in intensity, frequency, and geographic extent in diverse aquatic ecosystems due to complex interactions between climate change and human activities (e.g., nutrient enrichment, hydrological management, urbanization). Many bloom forming phytoplankton taxa have the capability of producing one or more toxic metabolites (e.g., microcystin, saxitoxin, domoic acid) that are harmful to vertebrates, including humans. In addition, some phytoplankton taxa can also produce volatile organic compounds (geosmin, 2-methylisoborneol, dimethyl sulphides, ß-cyclocitral) that cause taste-and-odor problems in drinking water supplies. Recent research has shown that phytoplankton metabolites may also serve diverse ecological roles in freshwater and marine systems by acting as photoprotectants, antibiotics, and allelopathic compounds. Although current research has identified many metabolites that are produced by cyanobacteria and eukaryotic algae, relatively little research has been completed on the mechanisms regulating metabolite occurrence, precise ecological or evolutionary function in aquatic systems, or how metabolite occurrence and magnitude may change in the future. This session aims to advance our understanding of processes regulating the occurrence, ecology, prediction, and management of cyanobacterial and algal metabolites in freshwater, estuary, and marine systems.

Keywords: Biogeography, Cyanobacteria, Ecology, Estuary, Lake, River, Marine, Modeling, Phytoplankton, Toxicology

SS08: Understanding Mountain Lakes in a Changing World

Jill Baron, U.S. Geological Survey (jill.baron@colostate.edu)
James Elser, FLBS, U MT (jim.elser@flbs.umt.edu)
Isabella Oleksy, Colorado State University (bellaoleksy@gmail.com)
Sudeep Chandra, University of Nevada (sudeep@unr.edu)

Mountain lakes are responding rapidly to global and local change due to their high elevation, small watersheds, and steep elevation gradients. They are also strongly under the influence of a changing cryosphere as ongoing climate change induces major shifts in in the extent of snowpack and glaciers. Mountain lakes are characteristically oligotrophic and many of them receive elevated atmospheric deposition of nutrients, acids, and contaminants. Introductions of nonnative species have affected food webs, diversity, and energy flow in many mountain lakes. High elevation zones in the northern hemisphere are warming faster than the global average, and mountain lakes are responsive to changes in precipitation amount, type, timing, and glacial retreat. Our symposium will draw on the unique characteristics of mountain lakes to explore ecological sensitivities to combinations of nutrient deposition, climate change, and non-native species, influences of global changes on food webs, energy flow, and habitats, and comparisons of contemporary changes to those from the past. Presentations draw on paleolimnology, space for time comparisons, long-term research, meta-analyses, and experimental approaches to address fundamental questions and key mechanisms by which mountain lakes respond to global change.

Keywords: Biogeochemistry, Climate Change, Ecosystem, Eutrophication, Lake, Microbial, Nutrients, Paleo, Phytoplankton, Trophic

SS09: Recent Advances in Aquatic Photochemistry

Michael Gonsior, Chesapeake Biological Laboratory (CBL) (gonsior@umces.edu)
Leanne Powers, Chesapeake Biological Laboratory (CBL) (lpowers@umces.edu)
Rossana Del Vecchio, University of Maryland (rossdv@umd.edu)
Neil Blough, University of Maryland (neilb@umd.edu)

All surface waters are exposed to UV-visible radiation, and hence photoreactions are critical in the biogeochemical cycling of carbon and nutrients, redox-active elements and compounds, and contaminants in the environment from nano to global scales. While there have been numerous studies in environmental photochemistry over the past 40 years, quantitative information on both direct and indirect impacts of many photochemical processes are still vague, especially in evaluating time-resolved photochemical processes. In order to improve our understanding of these important processes, the field has now moved well beyond bulk measurements made from samples simply left in the sun to using various innovative tools to target photochemical reaction mechanisms, reactive oxygen species formation and kinetics in complex systems from natural waters. In this session, we invite contributions that investigate the impacts of UV-visible radiation in chemical, biological and even engineered systems, ranging from natural organic matter and contaminant transformation, radical and redox species cycling, and direct/indirect impacts on biota. Contributions that highlight recent advances, novel insights, and future directions in all areas of aquatic photochemistry are particularly encouraged.

Keywords: Biogeochemistry, Carbon, Contaminant, Flux, Greenhouse gases, Metal, Oxygen, Microbial, pH, Toxicology

SS10: Microbial Activity in the Sea

James T. Hollibaugh, University of Georgia (aquadoc@uga.edu)
Gerhard J. Herndl, University of Vienna (gerhard.herndl@univie.ac.at)

Quantitative estimates of the contribution of bacterioplankton to aquatic foodwebs were facilitated by the development of methods for measuring rates at which macromolecules (notably DNA and protein) were synthesized by microbes. These methods, which were developed in the 1980’s and are still widely used, have a number of limitations for further resolution of carbon fluxes through microbial communities. Among them is that the measurement integrates over all of the cells in a sample, regardless of phylogenetic affiliation or cell-specific levels of activity. It would be useful to resolve production, as an emergent property of microbial communities, to specific taxa or guilds to better relate activity to e.g. geochemical processes or survival strategies. The widespread application of -omics approaches to analyzing the composition of microbial communities suggests the possibility of accomplishing this by combining classical methods for production estimates linked to -omics determinations of composition, or through calibrated ratios of properties such as transcript to genes. These complementary approaches have the potential to allow us decipher the dynamics and activity patterns of complex microbial communities. This session seeks to examine the progress made in estimating the flow of carbon through specific components of aquatic microbial foodwebs in light of these developments.

Keywords: Biogeochemistry, Food Web, Functional Ecology, Microbial, Production

SS11: The Biogeochemistry of Organic Matter: Cutting Across Ecosystem Boundaries and Aquatic Gradients

Patricia M. Medeiros, University of Georgia (medeiros@uga.edu)
Nicholas D. Ward, Pacific Northwest National Laboratory (nickdward@gmail.com)
Tomoko Komada, San Francisco State University (tkomada@sfsu.edu)
Byron C. Crump, Oregon State University (bcrump@coas.oregonstate.edu)

Water plays a key role on the movement of biogeochemical constituents across the Earth's surface through the continuum of soils, sediments, rivers and streams, oceans and atmosphere. Along their journey, organic molecules are transformed by biological, chemical, and physical processes, making the controls on organic matter composition and cycling highly complex. In this session, we seek to improve our comprehension of the fundamental mechanisms driving biogeochemical fluxes and transformations across riverine, estuarine, and marine gradients to enable development of process-based models for estimating the balances of carbon and related elements under different climate conditions. We invite contributions from all areas of biogeochemistry, molecular biology, and microbial ecology that cut across ecosystem boundaries, covering studies from a wide range of latitudinal settings and spatiotemporal scales in both pristine and human-influenced environments. Contributions that examine the mechanisms underlying observed patterns in distribution or rates of sedimentary, particulate, and dissolved organic matter transformations and their linkages to air-water CO2 exchange across aquatic gradients are encouraged. Molecular-level and interdisciplinary studies are particularly welcome.

Keywords: Bacterioplankton, Biogeochemistry, Carbon, Estuary, Genomic, River, Marine, Microbial

SS12: Integrating Ecosystems - linking biogeochemical cycles across aquatic and terrestrial boundaries

Jackie Webb, University of Regina (jackie.gat@gmail.com)
Nicole Hayes, University of Regina (hayes.nicolemarie@gmail.com)
Kerri Finlay, University of Regina (Kerri.Finlay@uregina.ca)

Aquatic environments play a pivotal role in elemental cycles, connecting the terrestrial biosphere with the ocean and atmosphere. From inland to coastal waters, aquatic environments transform, release, and transport carbon and nutrients at magnitudes often greater than their surrounding landscape. However, aquatic processes are rarely integrated into biogeochemical studies across the continuum of landscapes, owing to the disciplinary nature of science. This oversight has resulted in large gaps in characterising the significance of biogeochemical processes and transformations at the intersection of terrestrial and aquatic systems. Observations made across aquatic-terrestrial boundaries will greatly improve our mechanistic understanding of landscape-level functioning and help constrain gaps in the global cycles of carbon and nutrients. In this session, we seek interdisciplinary studies that examine aquatic-terrestrial linkages across ecological scales. We hope to see studies that address questions including: how are terrestrial resources transformed and transported through aquatic systems? what is the spatial and temporal importance of biogeochemical cycles in aquatic ecosystems relative to the landscape (e.g. whole-catchment budgets)? how do ecosystem process rates differ between terrestrial and aquatic ecosystems? and how does global change induced alteration to landscape connectivity affect carbon and nutrient cycles?

Keywords: Biogeochemistry, Boundary, Carbon, Ecosystem, Nutrients

SS13: Unraveling the Role of Physics on Biological and Biogeochemical Processes in Aquatic Ecosystems

Dominic Vachon, University of Geneva (dominic.vachon@unige.ch)
Alicia Cortes, UCSB (alicia.cortes@ucsb.edu)
Daniel F. McGinnis, University of Geneva (daniel.mcginnis@unige.ch)
Sally MacIntyre, University of California Santa Barbara

Water transports energy and matter into, within and out of aquatic ecosystems. In any biogeochemical cycles, assessing the rates of constituent transport versus the reaction rates is fundamental to understanding ecosystem functioning. The combination of external forcing (e.g. wind, solar radiation, surface heat exchange) in a changing climate with the specific physical and geomorphological properties of the water body creates endlessly variable environmental conditions in which biogeochemical cycles will occur. Physical processes such as convection, turbulence, stratification, currents, among others, will either constrain or enhance biological and biogeochemical processes by isolating or connecting different habitats. Physical processes therefore govern the connections between ecosystems habitats as well as mass transfer across the various interfaces with the adjacent compartments. This special session aims at presenting studies that highlight physical processes which affect biogeochemical and biological functions of aquatic ecosystems, from streams to the ocean, at various spatiotemporal scales, and using novel methodology or approaches based on field, laboratory or numerical experiments. We especially encourage scientists with various backgrounds to present results in the context of physics, as this session attempts to foster collaboration and discussion between hydrologists/physicists and biogeochemists/ecologists to collectively reach a more complete understanding of aquatic ecosystems.

Keywords: Biogeochemistry, Climate Change, Ecosystem, Flux, Hydrology, Modeling, Morphology

SS14: Social-ecological Dynamics in Aquatic Ecosystems

Chris Solomon, Cary Institute of Ecosystem Studies (solomonc@caryinstitute.org)
Stuart Jones, University of Notre Dame (sjones20@nd.edu)
Kathie Weathers, Cary Institute of Ecosystem Studies (weathersk@caryinstitute.org)

Researchers in freshwater and marine systems increasingly recognize that water connects ecological and social systems in complex and important ways. Understanding these social-ecological dynamics may be essential not only for managing aquatic ecosystems, but even for basic understanding of what we have previously viewed as primarily natural-system dynamics in these systems. In this session we bring together researchers from diverse perspectives who are working on social-ecological dynamics in freshwater and marine systems, on topics including but not limited to biogeochemistry, land use, water supply, urban ecology, and fisheries management. We are specifically soliciting talks that integrate bi-directional feedbacks between natural and human systems.

Keywords: Ecology, Sustainable, Resilience

SS15: Methane Production and Fluxes from Oxic Marine and Freshwater Systems

Daniel F. McGinnis, University of Geneva (daniel.mcginnis@unige.ch)
Hans-Peter Grossart, IGB (hgrossart@igb-berlin.de)
Pascal Bodmer, Universtiy of Koblenz - Landau (bodmer@uni-landau.de)
Daphne Donis, University of Geneva (daphne.donis@unige.ch)
Emily Stanley, University of Wisconsin (ehstanley@wisc.edu)

Inland waters emit significant amounts of methane to the atmosphere. However, the magnitude and mechanisms of these fluxes are still not adequately quantified or understood. Contrary to the common belief that methane is mainly produced in anoxic environments, this potent greenhouse gas can also be produced and emitted from oxygenated waters. During the last decades, increasing evidence shows that both marine and freshwater water bodies exhibit elevated methane concentrations in the oxic surface waters: the so-called “the methane paradox.” In deep stratified water bodies most of the methane from the sediment is oxidized by methanotrophic bacteria near the sediment and methane released via bubbles is mostly dissolved in the deeper water layers. Conversely, the methane-rich oxic surface waters are in direct contact with the atmosphere and thus may constitute a significant source of atmospheric methane. Several biotic and abiotic mechanisms have been proposed to explain “the methane paradox.” These include the formation of microenvironments and other novel pathways. In this session we wish to highlight the importance of methane production in oxic and anoxic environments, and estimate pathways and emissions for estimating total methane fluxes across the water-atmosphere interface resulting from this phenomenon.

Keywords: Climate Change, Flux, Lake, Greenhouse gases, Marine, Oxygen, Phosphorus

SS16: Change in Lakes and Rivers at Regional, Continental and Global Scales

Hilary Dugan, University of Wisconsin-Madison (hdugan@wisc.edu)
Luke Winslow, Rensselaer Polytechnic (lawinslow@gmail.com)
David Butman, University of Washington (dbutman@uw.edu)

Around the world, lakes and rivers are darkening, warming, and become saltier, but our understanding of these changes is often myopic, constrained by limitations in the spatial and temporal scope of available data and ecological theory. With multiple stressors concurrently affecting lakes, it is imperative to understand how aquatic ecosystems are changing, and what local, regional, or global processes are driving these changes. This session solicits research that focuses on limnological studies at regional to continental scales that examine long-term change in ecological, chemical, or physical characteristics of aquatic ecosystems, and the drivers of that change under a regime of multiple stressors. This session's goal is to promote and showcase cutting edge research in large-scale limnology.

Keywords: Biogeochemistry, Climate Change, Ecosystem, Ecology, Lake, River, Modeling, Nutrients, Stream, Watershed

SS17: Living Downstream from Shrinking Glaciers: Understanding and predicting the hydrology, geomorphology, ecology and biogeochemistry of glacier-fed streams

Tom J. Battin, Ecole Polytechnique Federale de Lausanne, EPFL (tom.battin@epfl.ch)
Dean Jacobsen, University of Copenhagen (djacobsen@bio.ku.dk)
Christopher Robinson, Eawag (Christopher.Robinson@eawag.ch)
Martyn Tranter, University of Bristol (m.tranter@bristol.ac.uk)
Stuart Lane, University of Lausanne (stuart.lane@unil.ch)

Mountain glaciers are shrinking rapidly worldwide owing to climate warming. However, cascading impacts of glacier shrinkage on glacier-fed streams and rivers are poorly understood at present. Current evidence suggests that shrinking glaciers profoundly shift hydrological and sedimentary regimes of glacier-fed streams, and biogeochemical and contaminant fluxes from continents to the oceans. This will influence the natural environment, including biodiversity and the ecosystem functions and services in glacier-fed streams. This session invites contributions from studies on hydrology, geomorphology, ecology and biogeochemistry in glacier-fed streams. We particularly welcome contributions that attempt to predict the effects of glacier shrinkage on the physical, chemical and biological processes and patterns in glacier-fed streams. We encourage presentations on studies from field surveys, experiments and modeling approaches, if possible interdisciplinary in nature and from various glacier-fed streams independent of geography.

Keywords: Biogeochemistry, Climate Change, Ecosystem, Ecology, Hydrology, River, Morphology, Stream, Watershed

SS18: Aquatic Ecosystem Development: Does function follow form?

Maryam Weigt, Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research and Helmholtz Institute for Functional Marine Biodiversity at the University Oldenburg (maryam.weigt@awi.de)
Thomas Brey, Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research and Helmholtz Institute for Functional Marine Biodiversity at the University Oldenburg (thomas.brey@awi.de)
Raghab Ray, Laboratoire des Sciences de l’Environnement Marin and Institut Universitaire Européen de la Mer   (raghab.ray@gmail.com)

Dario Fiorentino, Alfred-Wegener-Institut, Helmholtz Center for Polar and Marine Research and Helmholtz Institute for Functional Marine Biodiversity at the University Oldenburg (dario.fiorentino@hifmb.de)

Aquatic ecosystems constitute a network of interactions transferring matter and energy between organisms. Environmental conditions determine distribution and performance of organisms, thereby network's structure and capabilities to deliver a particular function. Organic matter and nutrients supply and maintain trophic interactions in organism assemblages, thus any changes in biogeochemical cycles (e.g., carbon, nutrients) driven by environmental disturbances may cause alterations in network structure, energy flow patterns and consequently the delivery of ecosystem services. Despite the growing research on "environmental change," there is still gap in knowledge related to the dynamics of ecosystem services under changing aquatic systems. This session will primarily focus on potential changes in services delivered by aquatic ecosystem beyond gross biogeochemical cycles. The aim of this session is to shed light on a number of open questions: Are there general patterns of such changes or a set of distinct scenarios? Is there any suitable conceptual framework available for such studies or do we need to develop one? Could such studies gain value from the inclusion of the human factor i.e. social dynamics? Will there be any functional changes in storage and fluxes of carbon due to complexity in ecosystem services under a changing environment? We invite both case studies and theoretical analysis on how multiple environmental drivers can induce multiple responses at different organizational levels and how such effects translate into changes of a significant ecosystem service.

Keywords: Biogeochemistry, Carbon, Ecosystem Service, Food Web, Functional Ecology


SS19: Influence of Water Levels and Water Level Fluctuations on the Ecology and Food Webs of Large Lakes and Reservoirs

Christina A. Murphy, Oregon State University (christina.murphy@oregonstate.edu)
Sherri L. Johnson, USFS PNW Research (sherrijohnson@fs.fed.us)

Dynamic water levels resulting from natural and anthropogenic stressors can alter ecological relationships, from chemical to biological processes. From climate change and droughts to dams and reservoir management, many large lakes and reservoirs are experiencing increased water level fluctuations. These alterations expose littoral areas and reduce water volume and depth. The implications of these fluctuations may include shifts in temperatures and depth of thermocline, changes in dissolved oxygen and nutrient cycling, methane releases, sediment resuspension, shoreline hardening, and cascading effects on zooplankton and lentic food webs. We welcome presentations on any of the broad range of topics related to the ecological impacts of alterations in water levels in natural and artificial lakes and reservoirs. The goal of this session is to exchange ideas and bring together scientists from diverse disciplines to improve our understanding of interconnected consequences resulting from changes in water levels in large lakes and reservoirs.

Keywords: Climate Change, Dams, Lake, Food Web, Zooplankton

SS20: Living in a Variable World: Studying the role and consequence of variance, covariance, and extremes in aquatic ecosystems

Alexander Wacker, University of Potsdam, Germany (wackera@uni-potsdam.de)
Sylvain Pincebourde, Université François Rabelais, CNRS, France (sylvain.pincebourde@univ-tours.fr)
Apostolos-Manuel Koussoroplis, Universite Clermont Auvergne (a-manuel.koussoroplis@uca.fr)

In the last two decades, the importance of higher order statistical moments (e.g., variance, co-variance, skewness and kurtosis) in biotic and abiotic factors slowly made its way in ecology, traditionally a science of means and averages. For instance, we know now that considering the variance around the mean temperature will be essential for understanding the physiological, ecological and evolutionary consequences of climate change. Yet, many challenges still hold in this flourishing research topic, which remains relatively underexplored in aquatic ecology. In a multifactorial world, how variable are the major ecological drivers compared to temperature - by far the most studied factor? What are the covariance patterns of environmental stresses and extremes, and at which spatio-temporal scales do they occur? How do aquatic organisms perceive and deal with such variability? What are the consequences of ecological variance and extremes scaling from the organismal to the population and the community level? This session welcomes theoretical and experimental studies on such questions conducted at any temporal and spatial scale, regardless if the variance is driven by physiological changes, behavioral movements, environmental gradients or seasonally driven successions of species.

Keywords: Adaptation, Climate Change, Ecology, Evolution, Functional Ecology, Population

SS21: The Damming of Rivers and Lakes and Its Effects on Biogeochemical Cycles

Sebastian Sobek, Uppsala University (sebastian.sobek@ebc.uu.se)
Raquel Mendonca, UFJF (raquel.mendonca@ebc.uu.se)
Nathan Barros, UFJF (nathanobarros@gmail.com)
Yves Prairie, UQAM (prairie.yves@uqam.ca)

Annika Linkhorst, Uppsala University, Sweden (annika.linkhorst@ebc.uu.se)

We are currently experiencing a global boom in the construction of dams. At least 3700 major dams are planned or under construction, primarily in emerging economies at low latitudes. While it is evident that dams trap sediment and alter the landscape as the reservoirs flood the land, the effects of these changes on biogeochemical cycling are not firmly established, and few quantitative rules exist to predict their impact. For example, the extent of greenhouse gas emission from reservoirs, and how it compares to pre-impoundment conditions, has been the subject of an intense debate. Similarly, the effects of dams on the cycling of phosphorus, nitrogen and other macronutrients, and the consequences for downstream aquatic and terrestrial systems, remain uncertain. Given the increasing number of dams, the need for solid scientific evidence that can guide decision-makers is greater than ever. Our understanding of the biogeochemical effects of dam constructions is limited by the comparatively small amount of available data, inconsistent methodologies, and inadequate conceptual frameworks. We therefore call for contributions to a special session that present new data, build on comprehensive methodologies, or close conceptual gaps. Empirical as well as theoretical contributions are welcome.

Keywords: Biogeochemistry, Carbon, Dams, Ecosystem, Greenhouse gases, Nitrogen, Nutrients, Phosphorus

SS22: Microbial Marine Biochemistry and Climate Change

Manoj Kamalanathan, Texas A&M University at Galveston (manojka@tamug.edu)
Antonietta Quigg, Texas A&M University (quigga@tamug.edu)
Jessica M. Labonte, Texas A&M University at Galveston (labontej@tamug.edu)

Climate change is happening at an exceptional rate and is poised to alter the environmental conditions. Increasing frequency of extreme events such as hurricanes, storms, heat waves, can cause severe changes to the physical and chemical properties of the oceanic zones, from epipelagic to bathypelagic. These zones are affected at different degrees by the extreme events, i.e. through heavy mixing, changes in salinity and/or temperature, which in turn will change the biochemistry and microbial flora that inhabit these environments. The production and excretion of products of biochemical reactions from one zone can act as substrates for the biochemical reactions of the microbes in the adjacent zone. This way, all the microbes in different zones are interdependent and any variation in epipelagic zone might have effects on bathypelagic zone. Understanding the effects of climate change on the oceanic zones and its microbial flora is important to predict extreme outcomes and help plan better management of these outcomes. We hope to highlight the importance of this problem by inviting contributions from all the research work focusing on biochemistry of marine microbes, which include viruses, bacteria, and protists, in a changing world. Proposed invited speakers: Jed Fuhrman, Paul Falkowski, Ed Delong

Keywords: Acidification, Biogeochemistry, Climate Change, Ecosystem, Marine, Microbial, Nutrients, Phytoplankton, Production

SS23: Trophic Interactions in Marine Micro- and Mesozooplankton

Enric Saiz, Institut de Ciencies del Mar - CSIC (enric@icm.csic.es)
Albert Calbet, Institut de Ciencies del Mar - CSIC (acalbet@icm.csic.es)

Both micro- and mesozooplankton are key players in the functioning of the marine pelagic food web. The transfer of energy from primary production to micro- and mesozooplankton is crucial to ultimately determine the productivity of the oceans. Even if this role of zooplankton is well acknowledged, many of the underpinning processes modulating it are not yet fully understood, and they are seldom properly parameterized in ecological and predictive models. This lack of knowledge is especially relevant given the expected variations in phytoplankton size and community structure consequence of climate change, that will eventually affect the response of zooplankton. In this session, we welcome contributions that incorporate new views into the studies of trophic interactions in zooplankton (functional groups, life history traits, behavior, trophic cascades, etc.), as well as new assessments of the trophic impacts of the zooplankton community on their prey. Both field and laboratory studies are aimed.

Keywords: Biogeochemistry, Food Web, Plankton, Trophic, Zooplankton

SS24: Terrestrial Organic Matter in Aquatic Food Webs: Resource subsidy or resource subtraction?

Sebastian Diehl, Umea University (sebastian.diehl@umu.se)
Stuart E. Jones, University of Notre Dame (sjones20@nd.edu)
Christopher T. Solomon, Cary Institute of Ecosystem Studies (solomonc@caryinstitute.org)

Flows of energy and matter across ecosystem boundaries can be major determinants of the functioning of recipient ecosystems. For example, input of terrestrial organic matter (t-OM) from the catchment supports between 10 and 90% of secondary production across most temperate to boreal lakes. Yet, t-OM is frequently a poor-quality resource, and dissolved t-OM carries light absorbing chromophores that shade primary producers. Thus, while environmental change scenarios predict t-OM supply to change in many lakes across the world, the overall importance of t-OM as a resource subsidy vs. resource subtraction for producers and consumers in recipient aquatic systems remains controversial. This session brings together theoretical and empirical researchers to synthesize our current understanding of the impact of t-OM on aquatic food webs and to suggest future directions. We particularly invite quantitative approaches that use modelling, experiments and comparative data along gradients of t-OM and interacting variables such as lake size and depth, nutrient loading, temperature, and trophic structure.

Keywords: Carbon, Ecosystem, Food Web, Resource, Production

SS25: Climate Change and Small Lakes: Physical, chemical, and biological responses

Derek Gray, Wilfrid Laurier University (dgray@wlu.ca)
Sapna Sharma, York University (sapna.sharma23@gmail.com)
Catherine O'Reilly, Illinois State University (cmoreil@ilstu.edu)

Small lakes, defined as less than 10 square kilometers in surface area, represent more than 99% of all lakes and more than 50% of surface fresh water worldwide. Recent global syntheses have suggested that over 90% of the world's lakes may be warming. Lake warming in response to climatic change may contribute to earlier thermal stratification, increased prevalence of algal blooms, and changes in the phenology of organisms. Understanding biological changes in small lakes is particularly important, as they represent areas of high biological production and methane emissions. Small lakes are also vulnerable to climate-driven changes in their watersheds because of the large amount of land/water shoreline interactions relative to their volume. This session will focus on highlighting physical, chemical, and biological responses to current and past climate change in small lakes around the world.

Keywords: Climate Change, Ecology, Lake, Fish, Phytoplankton, Zooplankton

SS26: Integrative Research on the Biogeochemistry of Inland Waters in Northern High Latitudes

Paul A. del Giorgio, University of Quebec at Montreal (del_giorgio.paul@uqam.ca)
Suzanne Tank, University Alberta (suzanne.tank@ualberta.ca)
Jan Karlsson, Umeå University (jan.p.karlsson@umu.se)
Rob Striegl, USGS (rstriegl@usgs.gov)

There is an increasing awareness and recognition of the global importance of inland waters as integrators of landscape conditions and climate, catalyzers of biogeochemical processing, sinks and sources of atmospheric C, and transporters of materials to the ocean. Nowhere are these roles more likely to be important than in boreal, subarctic and arctic regions characterized by high surface water coverage and complex and interconnected hydrological networks. The objective of this session is to showcase current aquatic biogeochemical research conducted in northern high latitudes, including boreal, subarctic and arctic regions. Contributions addressing the problems and possible solutions associated to scaling up aquatic biogeochemical processes at the watershed and regional levels, the extrapolation of these processes in time, and the integration of aquatic / terrestrial processes are encouraged. Further, there is increasing evidence that these complex boreal aquatic networks may exhibit overall biogeochemical patterns that cannot be derived from any of their individual components. Contributions that integrate boreal aquatic processes across streams, rivers, wetland and lakes and that explore emergent biogeochemical patterns at the network scale are also encouraged. The ultimate aim of the session is to provide a perspective of current and future aquatic boreal research.

Keywords: Biogeochemistry, Carbon, Climate Change, Greenhouse gases, Hydroconnectivity, River, Watershed

SS27: Advancing Knowledge and Management of HABs Through Interdisciplinary Collaboration

Kateri Salk, University of Waterloo (krsalkgu@uwaterloo.ca)
Jason Venkiteswaran, Wilfrid Laurier University (jvenkiteswaran@wlu.ca)
Victoria Pebbles, Great Lakes Commission (vpebbles@glc.org)
Morgan Steffen, James Madison University (steffemm@jmu.edu)

Harmful algal blooms (HABs) represent a water quality issue that transcends boundaries. Improving the fundamental and applied science of HABs is critically important to society, because HABs can prevent access to clean, safe water. HABs occur in a variety of freshwater and marine ecosystems, yet the environmental conditions driving their formation and persistence are inconsistent across spatial and temporal scales. Factors such as nutrient inputs, hydrology, climatic conditions, and microbial community interactions have previously been implicated in the growth and toxicity of HABs, often interacting in concert. Understanding HABs thus depends on the integration of many disciplines, including genomics, biogeochemistry, ecology, modeling, monitoring, and engineering. Further, mitigation of HABs requires effective communication of science from various disciplines to managers and a thorough knowledge of the socio-economic context in which the science can be applied through policy and management. This session will assemble scientists across multiple disciplines and geographic locations, using these diverse perspectives to advance our collective understanding of HABs and develop strategies to prevent or mitigate their impacts. We welcome abstracts that investigate the growth, impacts, and/or management of HABs from multiple disciplinary angles. Abstracts that employ cross-institutional collaboration are particularly encouraged.

Keywords: Biogeochemistry, Ecosystem, Ecology, Genomic, Modeling, Policy

SS28: Small Pond Ecology: Synthesizing current knowledge and identifying future research needs

Meredith Holgerson, Portland State University (meredith.holgerson@gmail.com)
Angela Strecker, Portland State University (strecker@pdx.edu)

This special session focuses on the ecology of small, shallow ponds or lakes. On a global scale, small ponds (1 ha) comprise over 95% of all lakes and ponds by area, and approximately 9% by surface area. They are hotspots for biodiversity and biogeochemical cycling, and may be especially sensitive to global environmental change. Yet, small ponds are vastly understudied relative to larger aquatic systems, which may bias our understanding of freshwater systems. This session aims to synthesize current knowledge of small pond ecology and identify future research needs. We envision topics covering community and food web ecology, ecosystem ecology, and biogeochemistry. Example topics may include community composition, food web dynamics, nutrient cycling, productivity and ecosystem metabolism, and small pond responses to global change. Studies that compare dynamics of small ponds to larger systems are particularly encouraged. This session will facilitate continued discussion regarding the importance of integrating small ponds into our broader understanding of limnology.

Keywords: Conservation, Ecosystem, Ecology, Lake, Food Web,

SS29: Putting Ecological Stoichiometry to the Test: When and where do ratios matter in aquatic ecosystems?

Casey M. Godwin, University of Michigan (cgodwin@umich.edu)
Seth K. Thompson, University of Minnesota (thom2587@umn.edu)

Foundational work in ecological stoichiometry revolutionized our view of interactions between organisms and their resources, and decades of subsequent work has greatly expanded the use of stoichiometry in diverse elements, organisms, and ecosystems. Despite this progress and the axiom that “stoichiometry connects organisms with cycles”, we often struggle to link the stoichiometry of biomass and resources with important ecosystem processes and patterns. For example, mechanistic experiments have shown how various plankton respond to nutrient imbalance, yet there is ongoing disagreement about when and where plankton in natural systems experience unbalanced resource ratios, and even which measurements accurately reflect those resource ratios. Similarly, few studies have explored how stoichiometric relationships of whole communities or food webs respond to environmental conditions or vary through space and time. The aim of this session is to highlight contemporary approaches to understanding the consequences of stoichiometry in aquatic ecosystems. We challenge presenters to consider the question "when and where do ratios matter for my organism, process, or ecosystem?" We encourage contributions on any level of biological organization and any aquatic habitat, but particularly those that critically evaluate the importance of stoichiometry (biomass, resources, or both) for the functioning, sustainability, or management of aquatic ecosystems.

Keywords: Ecosystem, Ecology, Food Web, Resource, Plankton

SS30: Make Stoichiometry Great Again! Coupled biogeochemical cycles through the freshwater pipe

Roxane Maranger, University of Montreal (r.maranger@umontreal.ca)
Stuart E. Jones, University of Notre Dame (sjones20@nd.edu)
James B. Cotner, University of Minnesota-Twin Cities (cotne002@umn.edu)

Understanding of carbon cycling in the 'freshwater pipe' has progressed amazingly in the past decade since the introduction of this concept. But it is time to put carbon cycling back together with other important biogeochemical cycles that have been manipulated to a similar or even greater extent than the carbon cycle, such as nitrogen, phosphorus and micronutrients. Furthermore, this must be done within the context of human modification of the hydrological cycle (or the pipe itself!) be it directly through modification of flow, or indirectly through climate change. In this session, we invite contributions that consider the feedbacks among coupled biogeochemical cycles mediated through the influence of different anthropogenic activities on load, productivity, decomposition, fluxes and how ultimately this alters the stoichiometry of elements through various components of the pipe. All contributions related to stoichiometric changes are welcome, but we particularly encourage contributions that consider this challenge from an ecosystem perspective.

Keywords: Biogeochemistry, Carbon, Dams, Ecosystem, Land Use, Nitrogen, Nutrients, Phosphorus, Production

SS31: Trait-based Community Organization Along Environmental Gradients: Ecological and evolutionary perspectives

Jonas Wickman, Umea University (jonas.wickman@umu.se)
Elena Litchman, Michigan State University (litchman@msu.edu)
Alexey Ryabov, University of Oldenburg (alexey.ryabov@uni-oldenburg.de)
Christopher Klausmeier, Michigan State University (klausme1@msu.edu)

Environmental variability is ubiquitous, and organisms constantly experience environmental gradients in space, resources, or other environmental factors. For example, phytoplankton are typically subjected to opposing vertical gradients in nutrients and light, horizontal gradients in resource distribution, and mixing of water masses from different depths and geographic regions. Over the last 15 years, a variety of trait-based approaches has been developed by theoreticians and empiricists to study the effects of environmental gradients on the composition and functioning of aquatic ecosystems. However, much is still unknown regarding how environmental gradients structure aquatic communities and drive species evolution in heterogeneous environments. Under these conditions, both ecological interactions and pressures of natural selection are strongly affected by environmental gradients, and may exhibit dynamics not otherwise possible. This session gathers both empirical and theoretical researchers in trait-based ecology with an interest in how environmental gradients shape communities. We aim to highlight new findings in metacommunity theory and trait-based approaches, and applications of these theories to aquatic communities. One important focus will be the comparison of ecological vs evolutionary perspectives on trait-based community organization along environmental gradients. We welcome contributions using quantitative approaches to the theoretical or empirical characterization of diverse aquatic communities in a trait-based framework, where environmental gradients play a critical role.

Keywords: Competition, Ecology, Evolution, Landscape, Resource, Modeling

SS32: The Aquatic Carbon Pipe - where, when, and why is it active or passive?

Lars J. Tranvik, Uppsala University, Sweden (lars.tranvik@ebc.uu.se)
Dolly N. Kothawala, Uppsala University, Sweden (dolly.kothawala@ebc.uu.se)
Anne M. Kellerman, Florida State University, USA (akellerman@fsu.edu)
Nuria Catalan, Catalan Institute for Water Research (ICRA), Spain (ncatalangarcia@gmail.com)
Joan Pere Casas-Ruiz, University of Quebec at Montreal (jpcasas@icra.cat)
Jose L. Ledesma, Swedish University of Agricultural Sciences, Sweden (jpcasas@icra.cat)
Susana Bernal, Centre for Advanced Studies, CEAB-CSIC, Spain) (jose.ledesma@slu.se)
Rafael Marce, Catalan Institute for Water Research, ICRA, Spain (rmarce@icra.cat)
Dominic Vachon ,Geneva University, Switzerland (Dominic.Vachon@unige.ch)

There is a wide consensus that vast amounts of organic matter are transformed during transport from soils to oceans, with two major end products, i.e. atmospheric carbon gases and sediment organic matter. However, the spatial and temporal distribution of these transformations remains poorly understood. Although there seems to be a gradual decrease in the half life of organic matter with increasing time spent in the aquatic continuum, studies of where, and to what extent, organic matter is either mineralized or lost to sediments show different patterns. Accordingly, organic matter reactivity appears to be highly passive, or active, depending on when and where studies are conducted. Moreover, the mechanisms that promote or retard transformations are poorly constrained. For example, there are contrasting views on the role of UV radiation, the role of priming, and a lack of studies on the functional role of landscape features (i.e. the hyporeic zone). This session aims to give a broad overview, and consolidate common findings, of the "where, when, and why" reactions of organic matter are more or less active. We welcome presentations on the patterns and mechanisms of organic matter dynamics that contribute to our overall understanding, from molecules to landscapes.

Keywords: Biogeochemistry, Carbon, Ecosystem, Ecology, Lake, Stream

SS33: Exploring the Role of Littoral Vegetation for Demersal Spawning Fish and Invertebrates in Coastal and Freshwater Systems

Patrick Polte, Thuenen-Institute of Baltic Sea Fisheries (patrick.polte@thuenen.de)
Dr. Paul Kotterba, Hamburg University (paul.kotterba@posteo.de)

Reproductive strategies that include the attachment of adherent eggs on littoral vegetation are ubiquitous in all waters from lakes to oceans. The successful reproduction of many aquatic taxa including fishes, amphibians, mollusks and other invertebrates depends on the availability of appropriate spawning substrate, i.e. submerged complex structures. Numerous of these animals represent outstandingly important fishery targets or ecological keystone species. Considering the accelerating anthropogenic alterations of lacustrine, riverine and coastal ecosystems, it becomes more than ever crucial to understand the basic spawning and reproduction requirements of the aquatic fauna therein. Evaluating the ecological function of littoral spawning habitats constitutes a strong baseline to develop a sustainable management of natural shorelines. This session will explore the state of knowledge on the ecological function of littoral vegetation as spawning habitat considering aspects of egg deposition, embryonic development and the specific interactions between aquatic plants and eggs attached thereon. The session's goals are to assemble the current expertise in littoral spawning ecology from limnic and marine sciences and to intensify the knowledge transfer between these research fields. We anticipate contributions focusing on the importance of vegetation for the reproduction of aquatic animals, corresponding plant-animal interactions and implications for management and conservation measures.

Keywords: Conservation, Fish, Habitat, Invertebrate, Sustainable

SS34: Temperature Dependence of Consumer-resource Interactions: New empirical and theoretical insights

Wojciech Uszko, Umea University (wojciech.uszko@umu.se)
Joey Bernhardt, University of British Columbia (joey.bernhardt@biodiversity.ubc.ca)
Colin Kremer, MSU (kremerco@msu.edu)
Elena Litchman, MSU (litchman@msu.edu)

Temperature-driven changes in physiological rates such as metabolism, feeding and growth can profoundly alter the transfer of energy and matter from resources to their consumers. Predicting the consequences of global warming for ecological communities therefore requires a deep understanding of how temperature affects consumer-resource interactions. However, ecology still lacks a broadly accepted, unified framework for the description and forecasting of temperature effects on consumer-resource dynamics. For example, both empirical studies and dynamical models have reported diverse, and often contrasting, responses of interacting species to warming in terms of population size, persistence and dynamic stability. This session brings together researchers studying temperature effects on consumers-resource interactions. We wish to highlight new findings, synthesize the state-of-the-art of this subject, and point at current challenges and future developments. We particularly encourage contributions that use quantitative approaches to empirically characterize and/or model the temperature dependence of relevant organismic traits and physiological rates, consumer-resource interactions, and food web dynamics at various spatial and temporal scales.

Keywords: Climate Change, Food Web, Functional Ecology, Resource, Trophic

SS35: Tipping the Scales: Examining broad-scale patterns and processes in limnology

Ian McCullough, Michigan State University (immccull@gmail.com)
Jean-Francois Lapierre, University of Montreal (jean-francois.lapierre.1@umontreal.ca)
Katelyn King, Michigan State University (kingka21@msu.edu)
Kendra Cheruvelil, Michigan State University (ksc@msu.edu)
Patricia Soranno, Michigan State University (soranno@anr.msu.edu)

Global change is one of the most significant threats to freshwater resources and ecosystems in the 21st century. It has already been well-documented that ongoing climate and land use changes at local, regional, and continental scales have previously and continue to alter freshwaters and surrounding watersheds and landscapes. To understand and predict how freshwaters will respond to these and other global changes, limnologists are increasingly examining freshwater ecosystems at a range of spatial and temporal extents. These studies represent a general trend in the aquatic sciences toward compiling and synthesizing site-specific datasets within broad analytical frameworks aimed at describing or modeling emergent broad-scale patterns. Our session brings together research from diverse ecosystems, geographic settings, and methodologies to highlight recent advances in the study of broad-scale patterns and processes in limnology with a focus on global change.

Keywords: Climate Change, Ecosystem, Land Use, Landscape, Modeling, Watershed

SS36: Linking -Omics to Eco-physiological Traits for the Study of Phytoplankton Acclimation and Adaptation

María Aranguren-Gassis, University of Vigo (aranguren@uvigo.es)
Maria Huete-Ortega, University of Cambridge (mh921@cam.ac.uk)

The use of -omics approaches, especially transcriptomics and proteomics, can be very useful to understand the processes of phytoplankton physiological acclimation and adaptation to environmental change. However, for better understanding how these processes can shape the plankton community, we need to link the results obtained at the molecular level to eco-physiological traits that allow us to extrapolate to population and community levels. This session welcomes contributions that, for example, study the -omic signature of phytoplankton acclimation and adaptation to stressful conditions, or studies that link eco-physiological traits and molecular responses. Other examples include works that find changes on traits due to acclimation/adaptation that suggest the use of -omics approaches for future research, or studies that address the use of traits, -omics or evolution concepts into the development of phytoplankton biotechnological applications.

Keywords: Adaptation, Phytoplankton, Transcriptomics, Proteomics, Acclimation, Traits

SS37: Long Fish on a Long Journey: How eels and lamprey link the mountains to the sea

Jonathan Studio, James Madison University (studioja@dukes.jmu.edu)
Dr. Christine May, James Madison University (maycl@jmu.edu)

The goal of "Long fish on a long journey: how eels and lamprey link the mountains to the sea" is to consolidate and interpret recent findings related to eels and lamprey, and their relationship with the diverse ecosystems they inhabit. The status of catadromous eel and lamprey populations are regionally distinct but their lifecycle requirements are similar, and therefore, recent discoveries will resonate beyond this session and influence far-reaching applications. A wide range of emerging topics (e.g., ecology, genetics, geomorphology, physiology, etc.) that aim to inform a multitude of disciplines (e.g., economics, conservation, politics, engineering, etc.) will be entertained with regards to these fish. Representation from academia, agencies, and tribes, from North America and Europe, will create an inclusive scope through which these emerging topics will be examined. Potential actions, which address the current threats to these fish (e.g., barriers to migration, loss of habitat, climate change, overharvesting, etc.), will be discussed in order to promote collaboration. This session is a great representation of the conference theme, "˜Water Connects," because it will connect freshwater and marine sciences, research and management organizations, and interdisciplinary collaborators.

Keywords: Conservation, Dams, Ecology, Fish, Hydroconnectivity, River, Marine, Population

SS38: Environmental Flows: Recent Science, Applications, and Policy Implementation

Curry R. Allen, Canadian Rivers Institute, UNB (racurry@unb.ca)
Dr. Wendy Monk, CRI/ECCC (wmonk@unb.ca)
Dr. Dan Peters, ECCC/UVictoria (daniel.peters@canada.ca)
Dr. Andre St.Hilaire, INRS (andre.st-hilaire@ete.inrs.ca)
Dr. Tim Jardine, University of Saskatchewan (tim.jardin@usask.ca)
Dr. David Armanini, PROTHEA Group (david.armanini@gmail.com)

Environmental flows (Eflows) as defined in this session would be the quantity, quality, and timing of water flows required to sustain freshwater ecosystems and the human livelihoods and well-being that depend on these ecosystems. The session may examine different assessment types used for Eflows, e.g., hydrologic/hydraulic/habitat, but will most probably focus on the holistic methodologies and frameworks. Holistic frameworks capture (1) flow requirements that provide ecosystem goods and services, and thus focus on managing for a resemblance to the timing, magnitude, and variability of the natural hydrological regime, and (2) the human component of valued ecosystem services. We will be seeking presentations that demonstrate examples linking flow and ecology, e.g., the ELOHA framework used to determine ecological limits of flow alteration at a watershed scale. Presentations will also be sought to demonstrate the conversion of the ecological and social processes into application and policy. The session would be attended by scientists, practitioners, and policy makers. The papers/posters would focus on our current state of the science and where it is leading, the application success (and not) stories, and the current state of policy development and implementation for environmental flows worldwide.

Keywords: Dams, Ecosystem Service, Ecosystem, Hydrology, River, Sustainable, Resilience, Watershed

SS39: Coastal Intelligence and Big Data

Paul A. Montagna, Texas A&M University-Corpus Christi (paul.montgana@tamucc.edu)
Hongmei Chi, Florida A&M University (hongmei.chi@famu.edu)

This session focuses on various algorithms and data analytics methods to study the problems of coastal resources using archived, existing, new data streams, and decision support tools to address, but not limited to, sea level rise, ecosystem dynamics, coastal hazards, etc. Most real-world coastal problems have to deal with huge datasets. The importance of coastal intelligence motivates the need to identify and understand appropriate data analytics algorithms that account for better solutions for those complex problems. Submitted papers should examine various algorithms or analytical approaches for solving any type of big data related problem. This session aims to provide a forum for scientists, framework developers, and experts to identify and discuss challenges in, and possible solutions for, solving problems in real-world via big data.

Keywords: Adaptation, Climate Change, Ecosystem, Sustainable, Modeling, Resilience

SS40: Innovations in Aquatic Science Education

Robert F. Chen, University of Massachusetts Boston (bob.chen@umb.edu)
Sarah Rosengard, University of British Columbia (srosengard@gmail.com)
Linda Duguay, University of Southern California (duguay@usc.edu)

The aquatic sciences incorporate the life sciences, the physical sciences, and the Earth sciences. Traditionally, it has been taught in disciplinary and multi-disciplinary curricula, but new approaches have relied on hands-on learning, out-of-home-learning, project-based learning, instructional technology, flipped classrooms, and Earth system science approaches. Innovative ideas are embedded in a variety of marine, environmental, and natural science programs, formal courses, and informal activities and delivered by a great diversity of educator. This session welcomes innovative approaches to teaching environmental and/or ocean sciences in grades 5-20 (middle school, high school, community college, university, graduate school, or out-of-school-time settings). An emphasis will be placed on evidence for effective teaching and learning.

Keywords: Education, Outreach

SS41: Ecological Implications of Microbial and Particulate Shape

Stuart Humphries, University of Lincoln, UK (shumphries@lincoln.ac.uk)
Lee Karp-Boss, University of Maine (lee.karp-boss@maine.edu)
Evan Variano, UC Berkeley (variano@berkeley.edu)

The striking morphological diversity in the plankton has captured the interest of limnologists and oceanographers for over a century but understanding of the physiological and ecological trade-offs associated with the shape and other morphological characteristics of cells remain rudimentary. This session aims to start a conversation among physiologists, ecologists physicists, and chemists to explore the variation and impact of external morphology on the micro-scale components of aquatic biogeochemical processes. In living organisms shape influences resource acquisition (light, nutrients), movement (active and sinking), and interactions with other organisms. For organic and inorganic particles and aggregates shape is far less easy to define, but impacts transport, aggregation and dissolution rates. The session will cover methodological, theoretical and experimental aspects of measuring and determining the impact of particle and cell morphology, from single bacteria and phytoplankton, through marine snow and TEP, to marine aggregates and colonial plankton.

Keywords: Bacterioplankton, Microbial, Morphology, Phytoplankton, Plankton

SS42: Long-term Monitoring of U.S. National Park Aquatic Resources

David Raikow, National Park Service (david_raikow@nps.gov)
Anne Farahi, National Park Service (Anne_Farahi@nps.gov)

The U.S. National Park Service maintains an Inventory and Monitoring (I&M) division tasked with the long-term monitoring of natural resources across the national park system. Programs are organized around networks of parks within ecological regions that span a huge variety of ecosystems from wetlands in Saipan to the intertidal-zone of Maine. Having collected data for over a decade, trends and patterns have been discovered with particular significance to natural resource management. This session will introduce the I&M program; present ecological trends and patterns within freshwater, brackish, and marine aquatic ecosystems of all types; and discuss implications for the design and refinement of long-term monitoring programs.

Keywords: Biodiversity, Climate Change, Conservation, Ecosystem, Land Use, Policy

SS43: Nature's Barometer? Microbes and Their Role as "Stoichiometers"

Thad Scott, Baylor University (Thad_Scott@baylor.edu)
Jim Cotner, University of Minnesota (cotne002@umn.edu)

Prokaryotic microorganisms represent the greatest biomass and biodiversity of life on Earth. These organisms can grow on a wide range of resources such as dissolved organic matter, detritus, light, inorganic molecules in both pelagic and benthic environments. Although the niche-diversity of prokaryotes remains unparalleled in nature, their basic biochemical composition is remarkably consistent. Increasingly, biological stoichiometry is being used to understand how microbes respond to diverse environmental conditions in nature based on the elemental ratios fundamental to life. We invite oral and poster presentations on any aspect of microbial stoichiometry in aquatic environments. We are interested in research that addresses the resource and biomass stoichiometry of microorganisms across a wide range of microbial growth conditions including, but not limited to, organic heterotrophs (autochthonous and allochthonous DOM; oxygenic respiration as well as denitrifiers and other respiratory processes), photoautotrophs, chemoautotrophs and chemoheterotrophs.

Keywords: Bacterioplankton, Biogeochemistry, Carbon, Cyanobacteria, Metal, Nitrogen, Phosphorus

SS44: Bringing the "Natural Flow Regime"¯ to Lakes

Catherine Hein, Wisconsin Department of Natural Resources (clhein@gmail.com)
Peter Lisi, UW-Madison (peter.j.lisi@gmail.com)
Noah Lottig, UW-Madison (nrlottig@wisc.edu)

The natural flow regime of streams has long been a mainstay of stream ecology, but lake level fluctuations have not been at the core of limnology. This may in part be due to limited lake level data and to a much longer cycle of variation. Given more extreme climatic patterns, a better understanding of the connections between hydrologic cycles and within lake processes is clearly needed. In this session, we will review techniques for defining natural lake level regimes. These may include analyses of historical lake level records, remote sensing techniques, empirical or theoretical models, or reconstructions from paleolimnology. We will then examine how lake level fluctuations influence lake ecosystems. We invite papers that study a variety of lake processes, including but not limited to water clarity, nutrient and carbon cycling, littoral habitat, riparian plants, invertebrate and fish communities, invasive species, and recreation. The primary focus of this session is on unregulated lakes, but lessons may be learned from raised lakes and reservoirs as well. Ultimately, we hope to both better define and understand the consequences of lake level fluctuations, particularly in an era of global change.

Keywords: Climate Change, Ecosystem, Ecology, Lake, Hydrology,

SS45: Gas Exchange at the Water-Atmosphere Interface in Lakes, Rivers, Estuaries and the Open Ocean

Judith Rosentreter, Southern Cross University, Lismore, Australia (judith.rosentreter@scu.edu.au)
Yves Prairie, University of Quebec (prairie.yves@uqam.ca)
Paul del Giorgio, University of Quebec at Montreal (del_giorgio.paul@uqam.ca)
Bradley Eyre, Southern Cross University, Lismore, Australia (bradley.eyre@scu.edu.au)

Gas exchange in aquatic ecosystems connects the water and atmosphere biogeochemical cycle. Crossing disciplinary boundaries, this session invites submissions from projects investigating the measurement and regulation of water-atmosphere exchange of greenhouse gases such as CO2, CH4 and N2O in inland waters, estuaries and the open ocean. In particular, we are looking for presentations with emphasis on 1) spatial and temporal (seasonal, tidal, diel) variability of water-air gas exchange; 2) different drivers that control fluxes and gas transfer at the water boundary layer; 3) revised and new parameterizations of gas transfer velocities in different aquatic ecosystems; and 4) advances in existing and new techniques to determine gas transfer velocities at the water-atmosphere interface.

Keywords: Biogeochemistry, Boundary, Estuary, Lake, Greenhouse gases, River, Marine, Stream

SS46: Connecting Microbial Communities: How dispersal of taxa shapes aquatic assemblages

Clara Ruiz-González, Instituto de Ciencias del Mar (ICM-CSIC) (clara.ruiz.glez@gmail.com)
Peter Hannes, École Polytechnique Fédérale de Lausanne (hannes.peter@epfl.ch)
Jerome Comte, Institut National de la Recherche Scientifique (INRS-ETE) (comte.j@gmail.com)

Microorganisms are major players in marine and inland waters, and thus understanding the mechanisms shaping their diversity and distribution is at the core of microbial community ecology. Aquatic microbial assemblages are known to be structured by local environmental filtering, but there is increasing evidence that dispersal of taxa between local communities plays a much larger role than previously though. Still, however, our understanding of how the movement of microorganisms influences local assemblages is limited and quantifying dispersal remains challenging. Recent studies show that dispersal can shape local community composition depending on hydrologic conditions and connectivity with the landscape in freshwaters, or through atmospheric transport, advection of water masses or sinking particles in the ocean, but its implications for community functioning or evolution are less understood. Laboratory experiments have also unveiled an astonishing capacity of microbes to persist under unfavourable conditions and grow when transported to suitable environments, suggesting that dispersal also provides insurance against environmental perturbations. This session invites researchers to present theoretical or empirical work related to the role of dispersal within or between aquatic ecosystems for all three domains of microbial life, approaches for quantifying dispersal processes and rates, or the exploration of microbial persistence capacities, among others.

Keywords: Bacterioplankton, Biodiversity, Biogeography, Lake, Hydrology, Marine, Microbial

SS47: Bridging the Gap Between Micro and Macro in Ecosystem Connectivity

Ana M. Queiros, Plymouth Marine Laboratory (anqu@pml.ac.uk)
Dr Kare Tait, Plymouth Marine Lab (ktait@pml.ac.uk)
Gary W. Saunders, University of New Brunswick (gws@unb.ca)

The macro- and micro ecological understanding of aquatic and marine ecosystems is often difficult to combine, troubled by inconsistencies in the scale of sampling designs, process measurements, appreciation of biological and ecological diversity and variability, and heterogeneity within habitats. Yet, successful examples exist across these communities, where hurdles have been overcome with a resulting improvement of our ability to understand natural cycles and flows of diversity, matter and energy. In this session, we aim to have a strongly interdisciplinary conversation focused on success stories, where macro- and micro-ecologists have worked side by side to investigate joint research questions and in this way improved our appreciation of ecosystem connectivity. We welcome contributions from all fields of research, but would encourage contributions from researchers working on processes and interactions shaping aquatic ecosystems such as trophic connectivity, biogeography, benthic-pelagic coupling, elemental cycling and environmental or anthropogenic disturbances.

Keywords: Biogeography, Ecosystem, Functional Ecology, Genomic, Hydroconnectivity, Nutrients, Population

SS48: Primary Production in the Atlantic Ocean: Past, Present and Future

Ana Fernandez-Carrera, University of Vigo (Spain) (afcarrera@uvigo.es)
Maria Perez-Lorenzo, University of Vigo (mplorenzo@uvigo.es)

Phytoplankton primary production is a key component of the biological carbon pump in the oceans. It fuels marine food webs through the transformation of inorganic nutrients into organic matter, and ultimately drives the exchange of CO2 between ocean and atmosphere, when that organic carbon is exported to the deep ocean. However, many uncertainties remain open on the temporal and spatial variability of primary productivity in the Atlantic Ocean. For instance, most of our current knowledge in vast tropical and subtropical areas builds on opportunity meridional cruises, carried out in late spring, autumn or early winter with low spatial resolution, which results in poorly defined summer activities and limited snapshots. Other unknowns include the impact of major river plumes or the definition of fine temporal scales in coastal systems. Understanding the past and present dynamics of the phytoplankton community is required to predict future changes triggered by climate variability and anthropogenic forcing. This session welcomes studies addressing the past, present and future variations in primary productivity from local to basin scales in the Atlantic Ocean. Different methodological approaches, such as field measurements, Earth observations or models will be considered.

Keywords: Carbon, Climate Change, Food Web, Marine, Phytoplankton, Production, Trophic

SS49: Advances in Methods and Technologies for Studying Methane Cycling in Freshwater Ecosystems

Tonya Del Sontro, University of Quebec at Montreal (tdelsontro@gmail.com)
Frederic Thalasso Siret, Cinvestav (thalasso@cinvestav.mx)
Jake Beaulieu, US Environmental Protection Agency (beaulieu.jake@epa.gov)
Karla C. Martinez Cruz, University of Magallanes (karla.martinez@umag.cl)
Kyle Delwiche, MIT (kyled@mit.edu)
Armando Sepulveda-Jauregui, University of Chile (armando.sepulveda@umag.cl)
Jeremy Wilkinson, University of Koblenz at Landau (wilkinson@uni-landau.de)

Methane is a major component of aquatic carbon cycling, involving many biogeochemical and physical processes. Methane is mainly produced in anoxic sediments, is released via diffusion, ebullition and through plants, is transported via dispersion and advection, and may be oxidized before emission to the atmosphere. Many other physical, biological and environmental processes directly or indirectly interact with these basic pathways. Moreover, the processes involved are subject to large spatial and temporal variability across multiple scales. The characterization of methane cycling therefore requires high throughput methods, preferably field deployable, to quantify the physical and biogeochemical processes involved. The objective of this session is to review up-to-date methods of interest, including field and modeling techniques, for the characterization of methane cycling in all aquatic ecosystems: lakes, reservoirs, wetlands, rivers and streams. We invite abstracts discussing novel approaches that investigate any aspect of the methane cycle, including but not limited to diffusion, ebullition, oxidation, spatial and temporal distribution, and its interaction with relevant physical, biogeochemical, and biological processes also occurring in the water column or sediment.

Keywords: Biogeochemistry, Carbon, Lake, Greenhouse gases, River, Stream, Wetland

SS50: Control of Algal Blooms

Weiping Hu, Nanjing Institute of Geography and Limnology, CAS (wphu@niglas.ac.cn)
Johann Rudolf STRICKLER, University of Wisconsin (strlab1@uwm.edu)

Algal bloom has been emerged as a primary water quality problems in lakes, estuaries and coastal waters of many regions wordwide. Its monitoring and forecasting and also stricter removal are benifit to the control of its ecological disaster and degradation of the water quality and the threats on water-supplying security. To control harmful algal blooms in surface waters is challenged with dealing with a multitude of biological, chemical, and physical parameters governing the growth of algae. Our session will provide a forum where topics from monitoring, algal bloom detecting and tracing, algal bloom modelling, forecasting, warning and risk assessment, and algae separating, harvesting and extraction technologies will be covered. Hence, we invite contributions that either focus on specific questions, or that enhance our holistic views of the nature of algal populations.

Keywords: Eutrophication, Lake, Modeling, Phytoplankton, Remediation, Wetland

SS51: Cyanobacterial Ecology as a Basis for Their Mitigation and Control Under Global Change

Bastiaan W. Ibelings, University of Geneva (bastiaan.ibelings@unige.ch)
Petra M. VIsser, University of Amsterdam (p.m.visser@uva.nl)
Cayelan C. Carey, Virginia Tech (cayelan@vt.edu)
Hans W Pearl, Univ North Carolina (hans_paerl@unc.edu)

The proliferation of research on cyanobacterial blooms in aquatic ecosystems during the past decade has greatly advanced our understanding of cyanobacterial ecology in a world experiencing global change. Starting with the 2008 hypothesis that "cyanobacteria like it hot," researchers have examined the role of multiple anthropogenic stressors, including land use and eutrophication, in concert with changing climate. Modelling results, experimental data, and field surveys suggest synergistic interactions between increasing nutrients and temperature may occur in waterbodies, but it is highly context-dependent on the ecology of individual taxa. Recent studies also indicate that increasing atmospheric carbon dioxide concentrations may promote cyanobacterial bloom expansion in highly productive lakes. Clearly environmental change is driving a blue-green future. To understand proliferation of blooms in a changing world, insights into ecophysiological traits and competitive interactions among cyanobacteria are crucial, and the basis for effective prevention, control and mitigation of blooms. The aim for aquatic management is to disrupt the physical-chemical or biological conditions that promote cyanobacterial taxa with specific traits (e.g. buoyancy, N2-fixation, toxin production), reflecting the environmental conditions where they proliferate. For this session, we invite contributions on any aspect of cyanobacterial ecology in relation to environmental change and bloom management.

Keywords: Climate Change, Cyanobacteria, Eutrophication, Nutrients, Phytoplankton

SS52: Parasites, Pathogens Everywhere: It's time for a closer look

Alena Gsell, NIOO-KNAW (a.gsell@nioo.knaw.nl)
Corina Brussaard, NIOZ (corina.brussaard@nioz.nl)
Thijs Frenken, NIOO-KNAW (t.frenken@nioo.knaw.nl)

Parasitism is a very common consumer lifestyle, and as such it is timely to highlight the diverse functions of parasites in shaping and driving ecological interactions and biogeochemical cycles in aquatic research. Viral, fungal and protist infections are observed in almost every water sample, be it freshwater or marine, and they are associated to each trophic level. Pathogenic parasites of phyto-, zooplankton and macrophytes are exceedingly common but have received relatively little attention thus far. Partly, this may be explained by methodological challenges that still hamper easy identification and quantification of pathogens. Moreover theoretical challenges, i.e. predictive frameworks of infection occurrence and impact on populations and flows of energy and matter, are still largely missing. Here we welcome both quantitative and theoretical contributions on all types of parasites (from viruses to helminths) and from all aquatic habitats, with the aim to showcase and discuss scientific progress as well as future research questions and approaches.

Keywords: Biogeochemistry, Food Web, Nutrients, Plankton, Population

SS53: Linking Metagenomics to Aquatic Microbial Ecology and Biogeochemical Cycles

Hans-Peter Grossart, Leibniz Institute for Freshwater Ecology and Inland Fisheries (hgrossart@igb-berlin.de)
David Walsh, Concordia University (david.walsh@concordia.ca)
Ramon Massana, Institut de Ciencies del Mar-CMIMA CSIC (ramonm@icm.csic.es)
Rebecca Vega Thurber, Oregon State University (Rebecca.Vega-Thurber@oregonstate.edu)
Marguerite Xenopoulos, Trent University (mxenopoulos@trentu.ca)

A general aim of microbial ecology is to observe, understand, and predict the distribution and interactions of microorganisms in the context of environmental conditions. Taxonomic profiling of different microbial communities often reveals significant but unexplained variations across aquatic environments both in space and time. Functional differences among organisms are often invoked as an explanation; and variation in gene content (assessed by metagenomics) often reveals dynamic relationships between metabolic pathways and environmental conditions, the strength of which typically depends on the magnitude of the environmental change between communities in different ecosystems. However, a major challenge in microbial ecology remains. Many taxa that appear functionally redundant at the metabolic pathway level do show significant variation across environments with different ecological features. Possible explanations include dispersal limitation, biotic interactions, and rapid adaptation to environmental conditions that are not easily predictable based on gene content alone. In this session, we will explore and discuss recent advances and current limitations about how large-scale meta-omics analyses can be integrated into biogeochemical and eco-evolutionary frameworks to better predict taxonomic and functional diversity patterns across aquatic ecosystems from lakes and rivers to oceans. This session will be the seed for a 2020 special issue of Limnology and Oceanography.

Keywords: Biodiversity, Ecology, Functional Ecology, Microbial, Population

SS54: Linking Microbial Ecology to Carbon Biogeochemistry Across Spatial Scales

Sophie Crevecoeur, University of Quebec at Montreal (sophie.crevecoeur@gmail.com)
Paula Reis, UQAM (paulacjr@gmail.com)
Trista Vick Major, University of Montana (tristyv@gmail.com)

Aquatic ecosystems are crucial components of the global carbon (C) cycle, acting as hotspots for the degradation and production of myriad C compounds. Most of this C processing happens through the activity of microorganisms, which possess diverse metabolisms and profoundly impact the composition of C compounds in water. Such metabolisms include autotrophy, heterotrophic DOM recycling, and the production and consumption of greenhouse gases. These processes occur and are controlled at a range of scales, from the genomic and cellular to the ecosystem and landscape. Through this session, we seek to better understand the interactions between individual microbial cells, microbial communities, and the cycling of carbon in aquatic environments. We invite contributors from marine and freshwater research targeting linkages between microbial ecology and carbon cycling across spatial scales from the cell to the landscape. Contributions that focus on the link between microbial diversity and ecosystem function, the controls on microbial cycling of carbon, or on microbial activity and rates of carbon transformation and/or their energetic balance, are welcome. The application of innovative approaches or new concepts related to microbial carbon cycling are especially encouraged to form a dynamic platform to discuss advances in the field of microbial biogeochemistry.

Keywords: Biodiversity, Biogeochemistry, Carbon, Greenhouse gases, Genomic, Microbial

SS55: The Lakes They Are A-changin'™: How concurrent long-term changes interact to affect aquatic ecosystems

Taylor Leach, Rensselaer Polytechnic Institute (RPI) (taylor.leach@gmail.com)
Luke Winslow, RPI (lawinslow@gmail.com)
Steve Jane, RPI (janes@rpi.edu)
Christine Goodrich, RPI (goodrc3@rpi.edu)
Alex Pezzuoli, RPI (pezzua@rpi.edu)
Kevin Rose, RPI (rosek4@rpi.edu)

Long-term environmental changes, typically measured at the decadal (or longer) scale, are altering lakes in many ways. Common long-term changes include climate change, eutrophication, browning and recovery from acidification, introductions of invasive species, and other issues associated with land use changes. Many of the ecological effects of these changes are traditionally studied in isolation, often in a single lake or region. However, it is becoming increasingly apparent that aquatic ecosystems are undergoing multiple, concurrent changes that may interact to exacerbate or mute the effects of any single environmental forcing. Additionally, regionally unique combinations of environmental change and diversity in lake characteristics introduce further complexity of response. This complexity further challenges our understanding of the effects and mechanisms of long-term change as stressors may interact in complex and nonlinear ways. In this session we seek to bring together research that improves our understanding of the effects of interactions among multiple long-term changes on aquatic ecosystem structure and function. We invite contributions from all lake research areas, from physics to chemistry to biology, that address drivers and/or responses of ecosystems to interacting long-term changes. Contributions that include empirical results on multiple changes at decadal-scales are especially encouraged.

Keywords: Acidification, Climate Change, Eutrophication, Invasive, Land Use,

SS56: Complexity in Coastal Systems

Robert F. Chen, University of Massachusetts Boston (bob.chen@umb.edu)
Shannon Davis, UMassBoston (shannon.davis002@umb.edu)

Coastal systems are dynamic, heterogeneous, and interconnected. Many coastal processes are non-linear, unpredictable, and ever-changing. Human society is often embedded in or encompasses coastal ecosystems, and human processes are intricately intertwined with natural processes such that problems with coastal systems are seen as "wicked", complex, and challenging. This session aims to celebrate this complexity welcoming presentations that explore the transdisciplinary nature of coastal systems, that attempt to model the system, or that engage a diversity of stakeholder in forming sustainable solutions. Examples include fisheries management, armoring shorelines, dam removal, and eutrophication, but could range much broader than these. Presentations focused on complexity in natural systems, complexity in human systems, and especially complexity in coupled human and natural systems.

Keywords: Acidification, Climate Change, Ecosystem Service, Estuary, Sustainable, Modeling, Resilience

SS57: Small Things Can Tell Big Stories: Algae as indicators in aquatic habitats

Andrew Bramburger, University of Minnesota Duluth (abrambur@d.umn.edu)
Euan Reavie, UMN Duluth (ereavie@d.umn.edu)
Sylvia Lee, USEPA (Lee.Sylvia@epa.gov)

In addition to forming the base of most aquatic food webs, algae exhibit high-fidelity, and often rapid responses to a host of environmental stressors. Their ubiquity and simplicity of collection make them well-suited as indicator species in both present-day and paleolinmological assessments of ecosystem status, as well as evaluations of anthropogenic impacts and the success of associated restoration and management initiatives. However, challenges associated with taxonomic consistency, standardization of collection techniques, and technological advances (e.g. -omics¯) necessitate discussion on how to most appropriately incorporate algal indicators into broader research or monitoring programs. In this session, we will explore several aspects of the application of algae as indicators including novel insights into physiological and ecological response to stressors, innovative monitoring and assessment approaches, taxonomic standardization, data management considerations, and recent results with broad impact. Presentations may focus on modern assessment and monitoring as well as paleoecological studies, and can cover any taxonomic group. Discussions of multiple stressors approaches that incorporate algae as indicators are also welcome. Disclaimer: Views expressed are the authors’ and not views or policies of the U.S. EPA.

Keywords: Biodiversity, Climate Change, Cyanobacteria, Eutrophication, Modeling, Paleo, Phytoplankton

SS58: Biogeochemical Transformations Across Terrestrial – Aquatic Interfaces

Amanda C. Spivak, Woods Hole Oceanographic Institution (aspivak@whoi.edu)
David T. Ho, University of Hawaii (ho@hawaii.edu)

Coastal ecosystems are among the most biogeochemically reactive environments because they sit at the interface of terrestrial, freshwater, and marine habitats. The dynamism of coastal ecosystems reflects interactions between the ecological, biogeochemical, and physical processes that control rates of organic matter production, transformations, and export. These processes occur over a range of spatial and temporal scales to affect local, regional, and, potentially, global biogeochemical cycles as well as the delivery of valuable ecosystem services. Our ability to estimate current and future rates of biogeochemical transformations requires an integrated approach that crosses traditional ecosystem boundaries and links processes over microbial-to-landscape scales. This is becoming increasingly important as ecosystems across terrestrial-aquatic interfaces respond to rising sea levels and experience more frequent and intense weather events. In this interdisciplinary session, we invite contributions examining ecological, biogeochemical, and physical processes that affect organic matter cycling and fate in tidal wetlands (fresh- and salt- water) and coastal waters. We welcome experimental, observational, and modeling studies based in the lab and field that bridge spatial and temporal scales; this includes, but is not limited to, plant-microbe interactions, vertical and lateral fluxes, redox, carbon, and nutrient chemistry, transient dynamics, spatial and temporal heterogeneity, and remote sensing.

Keywords: Biogeochemistry, Carbon, Ecosystem, Estuary, Wetland

SS59: Biodiversity - Ecosystem Functioning Under Stochastic Environmental Forcing

Maren Striebel, University of Oldenburg (striebel@limnology.eu)
Alexander Wacker, University Potsdam (wackera@uni-potsdam.de)
Dominik Martin-Creuzburg,, University of Constance (dominik.martin-creuzburg@uni-konstanz.de)
Andrea Gall, University of Oldenburg (andrea.gall@uol.de)
Gabriel Singer, IGB Berlin (Gabriel.singer@igb-berlin.de)

Understanding and quantifying the role of diversity in ecosystems is a key topic in ecology and of paramount importance in the face of global change. Climate change-associated precipitation patterns are expected to cause more frequent and more intense extreme events including droughts and floods. Consequently, we expect altered flow regimes in lotic systems, with implications for inputs of organic matter and nutrients into lentic systems. Future food webs from streams to lakes will likely encounter strong environmental signals of increased stochasticity and potentially complex, multivariate nature. Biodiversity may be mediating effects on ecosystem functioning. In our session, we aim to gather studies on how climate-change and specifically hydrology-related environmental forcing (1) affects food webs and ecosystem functions in lotic and lentic systems, and (2) how such effects can be mediated by organismic diversity. A particular focus rests on synchronization effects of environmental signals on spatially separated populations and communities. Here, stochasticity of environmental forcing may interact with biodiversity in shaping final effects for food webs and ecosystem functioning.

Keywords: Biodiversity, Climate Change, Ecology, Food Web, Hydrology,

SS60: Tools Used Today in Sustainable Aquaculture Development

Megan Otu, Fisheries and Oceans Canada (megan.otu@dfo-mpo.gc.ca)
Jay Parsons, Fisheries and Oceans (Jay.parsons@dfo-mpo.gc.ca)
Pablo Conejeros, Universidad de Valparaiso (pablo.conejeros@uv.cl)

This session will bring together scientists working to manage aquaculture impacts and showcase the toolkits used to advance this field of research. Finfish and shellfish reared in freshwater or marine environments are subject to changing ecosystems. The industry and regulators must adapt to changes like wild stock sizes, emerging diseases, and water temperatures. As aquaculture aims to expand to meet consumer demands, the impacts to the environment need to be assessed and managed to ensure sustainability. Submissions that apply innovative techniques to address sustainable aquaculture production and management are welcome. These may include tools and analysis of sediment chemistry (e.g., resulting from organic loading or chemotherapeutants), benthic community compositions, genetic or genomic (e.g., eDNA) screening, or pathways of disease transmission.

Keywords: Development, Fish, Resource, Sustainable, Production

SS61: Diversity in the Earth and Aquatic Science Communities: Progress and Challenges

Jonathan C. Lewis, Indiana University of Pennsylvania (jclewis@iup.edu)
Michael B. Jones, U.S. NSF (mbjones@nsf.gov)
Sharon Cooper, Columbia University (scooper@ldeo.columbia.edu)
Lisa Rom, U.S. NSF (elrom@nsf.gov)

The geosciences in general continue to lag other science, technology, engineering, and mathematics (STEM) disciplines in the engagement, recruitment and retention of traditionally underrepresented and underserved minorities. The aquatic sciences include disciplines commonly included within the geosciences, and disciplines outside of, but closely related, to geosciences in many regards. Diversity is a vital priority because it promotes innovation, strengthens the community's ability to tackle complex geoscience problems, and engenders widespread Earth science literacy. Recent attention and funding have been dedicated to improving undergraduate and graduate STEM education, including an emphasis on diversifying the geoscience community including the aquatic sciences. ASLO's long running Multicultural Program and NSF's, COSEE, INCLUDES, GOLD, and GEOPATHS efforts attest to the commitment of addressing underrepresentation in all areas of the geoscience community. Nonetheless recent studies suggest there remains significant room for progress; in AGI's current geoscience workforce report, only 3.5% of underrepresented minority geoscientists were oceanographers in 2013. The lack of diversity in the professoriate and in other mentorship roles likely contribute to comparable shortfalls in STEM overall and the aquatic sciences specifically. This session aims to provide a platform to share experiences, best practices, successes and challenges in approaches to diversifying the aquatic and geosciences across all levels of the community.

Keywords: Education, Marine, Sustainable, Outreach, Policy

SS62: Socio-ecological Complexity in Regulated Aquatic Ecosystems: Transforming potential conflicts into acceptable trade-offs

Katrine Turgeon, McGill University and Hydro-Quebec (katrine.turgeon@mail.mcgill.ca)
Alain Tremblay, Hydro-Quebec (tremblay.alain@hydro.qc.ca)
Francois Bilodeau, Hydro-Quebec (bilodeau.françois@hydro.qc.ca)
Carine Durocher, Hydro-Quebec (durocher.carine@hydro.qc.ca)

Rivers and estuaries are complex, dynamic and productive ecosystems, but their natural hydrological regimes can be altered by dams to achieve many societal benefits such as irrigation, water supply, flood control, recreation and hydroelectricity production. Recently, an unprecedented boom in dam construction in emerging economies is happening due to increasing needs for freshwater and electricity. Despite some clear ecosystems services and social benefits brought about by dams and reservoirs, these infrastructures are criticized globally because of their potential environmental (i.e., water quality, biodiversity, habitat fragmentation) and social impacts (i.e., water and food security, people resettlement). How can we achieve acceptable and sustainable trade-offs between water usages and ecosystems function and integrity? In this transdisciplinary session, we are especially interested in case studies experienced by different stakeholders and in which potential conflicts over aquatic ecosystems regulation were or were not (can or cannot be) transformed into acceptable and sustainable trade-offs. We welcome contributions from the academia, government, industry and first nations.

Keywords: Dams, Ecosystem Service, Ecosystem, Sustainable, Policy

SS63: Understanding The Mercury Cycle in a changing world: Linking Terrestrial and Aquatic Systems 

Andrea G. Bravo, Institute of Environmental Assessment and Water Research (IDAEA), Spanish National Research Council (CSIC) (jandriugarcia@gmail.com)

Brian Branfireun, Western University (bbranfir@uwo.ca)
Erik Bjorn, Umea University (erik.bjorn@umu.se)
Lars-Eric Heimburger, Aix Marseille Universite, CNRS/INSU, Mediterranean Inst. of Oceanography (MIO) (lars-eric.heimburger@mio.osupytheas.fr)

The toxicity of mercury (Hg) has raised international concerns. The Minamata Convention on Mercury has finally entered into force on 16 August 2017 and seeks to reduce Hg emissions and to protect human health and the environment from its adverse effects. However, defining and quantifying relationships between Hg sources, and Hg levels in the environment remain an important challenge. Understanding the biogeochemical factors controlling the fate of Hg is thus crucial to predict future Hg and methylmercury concentrations in the environment and biota. Moreover, future environmental changes such as increases in temperature, runoff, brownification, and primary production may alter the biogeochemical cycling of Hg in both terrestrial and aquatic (both freshwater and marine) environments. Given this, the reduction of Hg emissions alone will not necessarily translate into decreases in Hg in aquatic systems. Unveiling the fate of Hg at the interface of terrestrial and aquatic systems will improve current models of Hg cycling and result in more effective management strategies. We seek presentations describing fundamental processes driving Hg transformations and transport across terrestrial and aquatic ecosystems at a range of scales from the individual catchment to continents and oceans. Contributions that link these processes to risks for human health (i.e. food safety), and or future environmental change are also encouraged. 

Keywords: Biogeochemistry, Ecosystem, Eutrophication, Lake, Marine

SS64: Past, Present, and Future Phosphorus Cycling: From the mine to the deep sea

José Manuel Mogollón, Utrecht University (jmmogollonlee@gmail.com)
Peter Kraal, Royal NIOZ (p.kraal@uu.nl)

Human activities have drastically affected the global phosphorus (P) cycle. Large amounts have been extracted and mined from previously stable reservoirs and used for agricultural purposes. Due to inefficient fertilizer use, excess P from croplands enters the hydrosphere. Furthermore, increasing population densities have led to higher P concentrations in urban wastewaters flowing into freshwater systems. P moves along the hydrosphere stimulating primary production and thus exacerbating eutrophication, the spread of coastal "dead zones," and/or the proliferation of harmful algal blooms. P may also collect in soils/sediments and be released as legacy P during times of remediation. This session will convene soil and aquatic scientists that seek to elucidate the effects of cumulative P use and legacy on the health of the hydrosphere. We invite modeling, analytical, and field contributions that further our understanding of biogeochemical P cycling between various reservoirs from the local to the global perspective.

Keywords: Biogeochemistry, Ecosystem, Eutrophication, River, Sustainable, Oxygen, Nutrients, Phosphorus, Remediation, Watershed

SS65: Relevance of Host-microbe Interactions in Aquatic Ecosystem Functioning

Ulisse Cardini, Stazione Zoologica Anton Dohrn (SZN), Italy (ulisse.cardini@szn.it)
Grazia Marina Quero, SZN, Italy (grazia.quero@ve.ismar.cnr.it)
Marco Bartoli, University of Parma, Parma, Italy (marco.bartoli@unipr.it)
Jillian Petersen, University of Vienna, Vienna, Austria (petersen@microbial-ecology.net)
Rachel Foster, Stockholm University, Stockholm, Sweden (rachel.foster@su.se)

Beneficial host-microbe interactions are ubiquitous in nature. The microbial partners primarily act as facilitators of niche adaptation, and are a powerful driving force of speciation and evolution. Thanks to their expanded metabolic repertoire, host-microbe interactions can drive flows of energy and matter within their ecosystems, importantly contributing to nutrients cycling. Huge progress has been made in our understanding of host-microbe interactions thanks to the use of molecular tools. However, their relevance in ecology, physiology and evolution of aquatic organisms has only recently gained widespread recognition, and the major challenge remains to understand how such interactions contribute to the functioning of their ecosystems. In many host-microbe mutualisms, a single host harbors complex microbial communities, with a core and a flexible pool of different microbes representing a broad spectrum of potential contributions. It is inherently challenging to study such a multi-layered microbiota due to its enormous diversity, and models with reduced complexity can help to overcome these challenges. Concurrently, novel approaches are needed to investigate the role of complex and diverse host-microbe interactions within their habitats. This session thus welcomes contributions addressing the whole spectrum of different studies and approaches targeting the functioning of host-microbe interactions and their relevance in aquatic ecosystems.

Keywords: Adaptation, Ecosystem, Ecology, Flux, Evolution, Microbial, Nutrients

SS66: Salty Roads: The implications of increasing chloride on aquatic ecosystems

Shelley E Arnott, Queen's University (arnotts@queensu.ca)
James Rusak, OMOECC (jim.rusak@ontario.ca)
April James, Nipissing University (aprilj@nipissingu.ca)

Aquatic biodiversity and the numerous ecosystem services they provide, including commercial and recreational fisheries, drinking water, irrigation, and recreational opportunities are becoming increasingly threatened by road salting operations. Increasing chloride contamination has recently emerged as an important threat to water quality and aquatic life and we need to both quantify its impacts on lake ecosystems in a multiple stressor world, as well as provide solutions to manage and mitigate its effect. Presentations in this session will highlight current knowledge on the transport of road salts, the damage to aquatic ecosystems caused by increasing chloride contaminant concentrations, mutagenesis associated with chloride toxicity, potential adaptation among populations, species, and communities, interactions with additional stressors, comparisons with alternative road de-icers and other measures to reverse salinity and its adverse impacts.

Keywords: Adaptation, Biodiversity, Contaminant, Ecosystem Service, Salinity

SS67: Hydrologic, Ecological, and Biogeochemical Dynamics in Regulated River Corridors

Emily B. Graham, Pacific Northwest National Laboratory (emily.graham@pnnl.gov)
James C. Stegen, Pacific Northwest National Laboratory (james.stegen@pnnl.gov)
Tim Scheibe, Pacific Northwest National Laboratory (tim.scheibe@pnnl.gov)

In most ecosystems worldwide, major rivers are increasingly managed to meet hydropower demands and maintain water availability. This expansion of human alteration poses ecological risks to freshwater ecosystems that are only beginning to be realized. The goal of this session is to bring together researchers investigating disparate scientific disciplines in managed river corridor ecosystems, and facilitate a holistic understanding of river management impacts on ecosystem health. Prior research has revealed numerous impacts of river management such as (1) hydrologic shifts that impact groundwater-surface water mixing; (2) changes to temperature regimes and to the extent of biogeochemical hotspots and hot moments; (3) increases in greenhouse gas emissions from reservoirs; and (4) alterations to aquatic food webs due to river flow management (e.g., short-term hydropeaking and long-term drought mitigation). We welcome any research investigating a single or multiple disciplines in managed river systems. We especially encourage submissions focused on the interconnectivity of hydrology, ecology, and/or biogeochemistry, though interesting work on a single aspect of managed systems will also be considered. Only by understanding the relationships among these components of river corridor ecosystems can we enable process-based decision making for sustainable river corridor management.

Keywords: Biogeochemistry, Dams, Food Web, Greenhouse gases, Hydroconnectivity, Sustainable, Microbial, Modeling, Resilience, Watershed

SS68: Aquaculture: Current Issues, Trends, and Prospects

John F. Marra, Brooklyn College-CUNY (jfm7780@brooklyn.cuny.edu)
Dror Angel, University of Haifa (adror@research.haifa.ac.il)

With capture fisheries mostly fully exploited worldwide, aquaculture now supplies two-thirds of the global food fish supply. Aquaculture operations span environments from the land to the sea, from re-circulating systems to coastal waters, from single-species operations to multi-trophic, and from seaweed to predatory fish. This session is open to all who are researching or conducting aquaculture operations, or are interested in a discussion of the issues and prospects.

Keywords: Biotechnology, Development, Eutrophication, Fish, Resource, Sustainable, Policy, Trophic

SS69: Benthic-pelagic Coupling: Energetic costs, energy flow, and ecosystems

Amanda S. Kahn, University of Alberta (kahn@ualberta.ca)
Sally P. Leys, University of Alberta (sleys@ualberta.ca)

Benthic-pelagic coupling, or the transfer of energy or nutrients from the water column to the benthos, is an important ecosystem function that supports communities in both marine and freshwater habitats. But it is not free. Benthic and pelagic suspension feeders, deposit feeders, and microbial activity play an important role in transforming nutrients from the water column into usable organic material, which become oases of food for benthic ecosystems. However, the activity used for such transformations is constrained:“ it costs energy to filter-feed, to produce particle-capturing tissues, to remineralize nitrogen species, etc., in addition to the already existing costs of growth, respiration, reproduction, and excretion. This session invites talks that investigate organisms involved in benthic-pelagic coupling from a cellular scale up to an ecosystem scale in freshwater and marine ecosystems. We aim to include physiological studies of the costs and adaptive mechanisms by organisms involved in benthic-pelagic coupling, estimates of the effects of a population on energy flow to the water column or benthos, and the effects of community-level diversity or ecosystem processes on the importance of benthic-pelagic coupling.

Keywords: Carbon, Ecosystem Service, Flux, Functional Ecology, Invertebrate, Oxygen, Nutrients, Plankton, Trophic, Zooplankton

SS70: Developing Methodologies for the Remote Investigation of Complex Topographies Across a Range of Scales

Autun Purser, Alfred Wegener Institute (autun.purser@awi.de)
Katleen Robert, Memorial Uni Canada (robert.kathleen@googlemail.com)

Rapid technological developments are providing ever more tools for investigating the deep seafloor remotely. Increasing achievable resolution of camera systems, coupled with improvements in lighting techniques facilitates the collection of seafloor images suitable for resolving fauna or habitat features of ever smaller size. AUVs, ROVS and towed sleds are also now capable of mounting acoustic sidescan systems which can map many meters of seafloor to a resolution of cm swiftly, and accurately. In line with these technological developments, new approaches to data analysis are needed. Numerous photogrammetry and image mosaicking techniques are allowing models of even complex seafloor features, such as hydrothermal chimneys, coral reefs, steep and overhanging cliffs and sponge gardens to be accurately produced and available for answering a range of scientific questions on habitat use, ecosystem functioning and also for use in the monitoring of regions undergoing anthropogenic impacts, such as deep sea mining or bottom trawling. In this session we would like to invite researchers working with these high volume, high precision data sets to present and discuss their workflows with peers, to spark cross-fertilisation of work practices and stimulate debate.

Keywords: Biodiversity, Biogeography, Ecosystem, Ecology, Habitat, Marine

SS71: Crossing Disciplinary Boundaries Across the Freshwater-Marine Continuum to Advance the Understanding of Harmful Algal Blooms (HABs)

Bryan Brooks, Baylor University (bryan_brooks@baylor.edu)
Meredith Howard, SCCWRP (mhoward@sccwrp.org)
Jeff Steevens, USGS (jsteevens@usgs.gov)
Alan Wilson, Auburn University (wilson@auburn.edu)

Harmful algal blooms (HABs) comprised of toxigenic algae and/or cyanobacteria threaten global marine, estuarine, and freshwater ecosystems and related services. Their frequency and intensity are hypothesized to increase with climate change and eutrophication. Although HABs represent a significant human health threat, the science assessing their occurrence, fate, toxicity, and risk to public health and the environment remains fragmented among limnologists, marine scientists, toxicologists, ecologists, chemists and engineers. While mechanisms that promote HABs across systems are routinely similar (e.g. elevated nutrients, light, salinity, carbon dioxide, temperature), a unified understanding of the factors that cause these events is lacking. Perhaps more importantly, communication gaps among scientists studying bloom formation and ecosystem effects and those studying the eco- and health toxicology of blooms have hindered effective HAB managements. This session seeks to bring together HABs scientists who study multiple aspects of these events, including their biogeochemistry, chemistry, biogeography, toxicology, ecology, and epidemiology, as well as approaches to monitor HAB distribution, genetic diversity, and toxicity as well as transport of intact toxins from inland freshwaters to downstream marine and estuarine waterbodies. All types of HABs studies are encouraged including descriptive, correlative, empirical, and/or theoretical. Given the environmental and health threats that HABs pose to society, we encourage a focus on management solutions.

Keywords: Climate Change, Contaminant, Cyanobacteria, Eutrophication, Land Use, Marine, Nutrients, Plankton, Salinity, Toxicology

SS72: Ocean Acidification and Carbonate Chemistry Monitoring: New Approaches and Tools

Christopher Hunt, University of New Hampshire (chunt@unh.edu)
Joseph Salisbury, UNH (joe.salisbury@unh.edu)
Claudine Hauri, University of Alaska- Fairbanks (chauri@alaska.edu)
Steffen AssŸmann, Kongsberg Maritime Contros GmbH (Steffen.Assmann@km.kongsberg.com)

Ocean and coastal acidification is receiving growing recognition due to potential adverse effects to billion dollar industries such as commercial fisheries. This growing concern has resulted in new approaches and tools for monitoring efforts. Significant advancements in sensor technology have led to multi-year scientific campaigns in the fields of climate studies, air-sea exchange and ocean acidification, CO2 sequestration applications , aquaculture, and limnology. This session will focus on the advancement of sensor technology and platform integration for ocean acidification monitoring and aquatic carbonate chemistry measurements in general. The program will highlight the different sensor technologies while also focusing on sensor carriers (platforms). These technologies may range from commercially available systems to unique prototypes and novel uses of existing sensors, with applications stretching beyond research into resource management, industry, and other sectors. The goal of the session will be to list successes and learn from deficiencies and to take a look ahead. In addition, this session will challenge the presenters to list how their research influences regional decision-makers and stakeholders. Examples could include how multi-institutional approaches have led to an improvement in scientific research, or and how that research is used to educate the general public.

Keywords: Acidification, Biogeochemistry, Carbon, Marine, pH

SS73: Upstream and Downstream Effects of Physical Barriers on Aquatic Systems

Miles E. Daniels, UCSC (miles.daniels@ucsc.edu)
Eric M. Danner, NOAA (eric.danner@noaa.gov)

Physical barriers on rivers have upstream and downstream effects. Whether natural or anthropogenic, barriers alter the connectivity and transfer of physical, biological, and chemical material through rivers. Natural structures, such debris jams and beaver dams, can play an integral role in ecosystem evolution, contributing habitat diversity. Human-made structures often have less desirable effects, fundamentally disrupting landscapes and processes by delaying or altogether stopping the downstream or upstream migration of material, such as sediment and biota. Understanding how physical barriers in riverine systems relate to and effect ecosystem processes is crucial to understanding the larger, landscape scale functions of watersheds. In this session, we invite proposals on diverse research topics related to the effects of physical barriers on rivers. Topics examining impacts of natural and anthropogenic barriers related to functional ecology, geomorphology, water quality, and environmental/public health are encouraged. Additionally, presentations with a focus on examining effects of barriers over space and time, such as removal of small man-made structures and subsequent ecosystem response are welcomed.

Keywords: Dams, Ecosystem, Functional Ecology, Habitat, Landscape, River, Watershed

SS74: Ch[art]ing the Waters: Artists investigate aquatic worlds and environmental change

Nina Haft, California State University, East Bay (nina.haft@csueastbay.edu)
Lauren Elder, Independent Artist (lelderoakland@gmail.com)

Humans have studied the forms, phenomena and mysteries of water since our beginnings. The oldest examples of Australian Aboriginal rock art, including depictions of waterholes, are estimated to be as much as 40,000 years old. Proceeding from this lineage, contemporary artists are posing questions, checking assumptions, observing patterns, acting creatively and modeling the future of water, which is the lifeblood of the human body and of the planet. Ch[art]ing the Waters maps this growing body of aesthetic and sensory practices. There is urgency and also timelessness in this endeavor. What do today's artists contribute to understanding and working with water as a resource, a process and a habitat? What critical changes are triggered when artists sit at the table with scientific researchers in the physical, biological, geological, environmental fields? How might artists and scientists partner in solving today's problems? This session invites presentations by artists whose materials, methods, forms and are focused upon water in all its forms. This session will target an interdisciplinary audience to explore art and science as complementary modes of creative inquiry in response to local and global issues of water, launching new conversations and opening new routes of action.

Keywords: Habitat, Resource, Modeling

SS75: Integrating Science and Management at the Coastal Interface: Landscape-Based Approaches and Application to Watershed, Coastal, and Ocean Resource Management

Franklin B Schwing, NOAA NMFS (franklin.schwing@noaa.gov)
Roger Pulwarty, NOAA ESRL (roger.pulwarty@noaa.gov)

The growing complexity of natural resource users, jurisdictions, and regulatory authorities has placed a greater emphasis on integrated management at landscape or ecosystem scales. Largely because of the scope of those authorities, the management of watershed, coastal, and ocean systems and their resources has developed independently and at different paces, despite the strong interconnectivity of these systems. This session will consider three applications of integrated management --“ watershed, coastal zone, and marine ecosystem --“ and their nexus. These management applications are the focus because of the need for their coordination at, and integration across, the land-ocean interface. Such integrated approaches have been widely-recommended as key components of climate adaptation strategies. This session brings together policy experts, scientists, and managers from these landscapes to: 1) highlight resource managers' and users' needs, and what scientists are doing to meet them, 2) share lessons from each spatial management sector, 3) identify common strategies and principles to these approaches, and 4) discuss how to integrate science and management across the coastal interface as these environments change over time. The session will contrast the recent application to marine ecosystems, to more seasoned efforts in the coastal zone and the even longer history of watershed management.

Keywords: Boundary, Ecosystem Service, Ecosystem, Habitat, Resource, Marine, Policy, Watershed

SS76: Coastal Marine Biodiversity in the Face of Resource Management

Francis Juanes, University of Victoria (juanes@uvic.ca)
Kieran Cox, University of Victoria (kcox@uvic.ca)
Morgan Black, University of Victoria (morganjeanblack@gmail.com)

The need to understand coastal marine biodiversity, what drives it, and how it responds to various anthropogenic stressors, including resource extraction, has never been more critical. Such understanding can inform best practices of marine planning and resource management to better support food security, foster relationships among stakeholders, and promote healthy oceans. This session will explore drivers and responses in marine biodiversity in ecosystems subjected to varying levels of resource extraction. Topics of interest include but are not limited to, contemporary and historical resource extraction and management, present and future threats and how to mitigate them, how to support collaboration with stakeholders, aquaculture innovation, and best practices, and assessment methods that are both rigorous and practical.

Keywords: Biodiversity, Development, Conservation, Ecosystem Service, Resource, Sustainable

SS77: Microbial Exchange and Ecological Interactions Among Sediment, Water, and Air: Emerging complexities in managing aquatic environments

Gregory O'Mullan, Queens College, City University of New York (gomullan@qc.cuny.edu)
Andrew Juhl, LDEO- Columbia (andyjuhl@ldeo.columbia.edu)
M. Elias Dueker, Bard College (edueker@bard.edu)

Management of aquatic environments often focuses on microbial composition and activity in reservoirs of water, sediment or air. Research into the exchange of microbes among these reservoirs allows for increased understanding of aquatic microbial ecology and opportunities for improved monitoring and management of microbial pollutants. Examples of relevant exchange processes and ecological interactions include: the importance of particle sinking flux and resuspension between water and sediment; differing microbial contaminant persistence in water and sediment/beach sand; groundwater transport into coastal systems; and aerosol or flood event transport of aquatic microbes back into terrestrial systems. Studies of these processes have relevance for fecal pollution monitoring and modeling, understanding the dynamics of beach sand microbial contamination, algal toxin transport, and the drivers of gastrointestinal and respiratory illness in coastal environments. This session welcomes contributions from both freshwater and marine systems and any aspect of microbial exchange or ecological interaction among reservoirs relevant to managing aquatic environments.

Keywords: Atmosphere, Bacterioplankton, Contaminant, Marine, Microbial

SS78: Freshwater CyanoHABs: Beyond eutrophication

Gretchen Rollwagen-Bollens, Washington State University (rollboll@wsu.edu)
Anas Ghadouani, University of Western Australia (anas.ghadouani@uwa.edu.au)

The frequency and magnitude of harmful cyanobacteria blooms (cyanoHABs) in freshwater ecosystems have increased over the past 50 years, and are expected to accelerate under future climate change. In the past decade, many investigators have examined the factors that influence freshwater cyanoHABs, particularly the role of eutrophication. And several reviews published between 2008 and 2013 highlight the potential significance of other drivers of cyanoHABs, such as temperature, mixing, and CO2 concentration, that may be interacting with increased nutrient availability to produce more intense blooms (e.g. Hudnell et al. 2008, O'Neil et al. 2012, Merel et al. 2013). In this session we invite submissions from investigators who are testing the interactive effects among these factors and in the context of changes in nutrient quantity and quality, thus going "beyond eutrophication"¯ to examine how cyanoHABs develop in freshwater, how they become so intense and potentially toxic, and how these patterns vary across spatial and temporal scales. We encourage submissions from those with field observations, experimental programs, and modeling results from a range of latitudes and hemispheres. We particularly encourage submissions from scientists working in regions currently under-studied and/or under-reported in the cyanobacteria bloom literature (e.g. eastern Europe, Africa, and South America).

Keywords: Climate Change, Cyanobacteria, Ecology, Eutrophication, Microbial, Nutrients, Phytoplankton, Plankton, Toxicology, Trophic, Zooplankton

SS79: The Importance of Phytoplankton Diversity for the Maintenance of Ecosystem Functions in Freshwater Lentic Systems

Patrick Venail, University of Geneva, Department FA Forel (Patrick.Venail@unige.ch)
Bastiaan Ibelings, University of Geneva (Bastiaan.Ibelings@unige.ch)

Freshwater lentic ecosystems (e.g. lakes, ponds, reservoirs) are vital for humanity as providers of a variety of ecosystem services. Still, anthropogenic activities leading to contamination, eutrophication and reduction of its associated biodiversity are putting these ecosystems under major stress. Within the plethora of organisms living in freshwater ecosystems phytoplankton is the base of the entire trophic web and is known to play a major role in the fluxes of matter and energy. Despite the recent efforts to better understand the structure, composition and functioning of phytoplankton communities in freshwater systems we still have a pretty limited understanding of the impact of phytoplankton diversity on ecosystem functioning. We lack information especially on how its diversity simultaneously influences multiple functions such as nutrient use and subsequently biomass production. The aims of this special session are to explore the evidence on the impact phytoplankton diversity on ecosystem functioning in freshwater lentic systems, to underline the major gaps in our current knowledge and, most importantly, to find ways to move forward in this field of research.

Keywords: Biodiversity, Ecosystem Service, Lake, Functional Ecology, Nutrients, Phytoplankton, Production

SS80: From Headwaters to Coastal Zones: Emerging and legacy contaminants in aquatic ecosystems and their effects

Karen Kidd, McMaster University (karenkidd@mcmaster.ca)
Anders Goksoyr, University of Bergen (Anders.Goksoyr@uib.no)
Dan Schlenk, University of California Riverside (dschlenk@ucr.edu)

From point source inputs of wastewaters to diffuse runoff from catchments, freshwaters, estuaries and coastal zones are subject to inputs of a plethora of persistent and non-persistent contaminants with the potential to accumulate, magnify and affect aquatic life and their predators, including humans. This session invites innovative and thought-provoking presentations that shed new light on legacy contaminants such as persistent organic pollutants or hydrocarbons or that address the growing concerns around emerging contaminants (microplastics, pharmaceuticals, etc.). We welcome talks that describe new approaches to understanding the fate and impacts of contaminants on diverse aquatic systems and organisms, cross boundaries of approaches, geographies, and disciplines (e.g., One Health or links between omics and higher-level responses, comparisons of lab and field data, temperate versus high-latitudes, salinity gradients), contrast responses across taxa, and advance our appreciation of the spatial and temporal links between water quality and ecosystem responses. This session is designed to encourage dialogue and knowledge exchange around the more pressing problems related to contaminants in fresh through marine waters.

Keywords: Contaminant, Land Use, Toxicology

SS81: Deepening And Sustaining Marine Sciences In Africa: ASLO to the Rescue

Daniel Lawrence Effiong, University of Benin, Benin City, Nigeria (larryeffiongdaniel@gmail.com)
Ngozi Oguguah, NIOMR, Lagos (ngozimoguguah@yahoo.com)

The session will cover trends, challenges, prospects, and awareness of marine sciences in Africa. Marine science is still at its budding stage when compared to the advancement and modernity brought to bear in other climes especially United States and Europe. Areas of high biodiversity such as coastal wetlands, mangrove forests, salt marshes and coral reefs are increasingly threatened by development and hazards, thousands of hectares ecosystems lost over the past years. Overfishing and dredging over four decades, whether illegal, unregulated, or regulated by unsustainable international agreements, has contributed to a massive decline in fish stocks, particularly off West Africa. The issue of climate change and global warming and its effects on African marine biodiversity becomes more worrisome. Focus will be on the issues encountered in promoting marine sciences and research, and immediate, short and long-term solutions to the challenges will be proffered, highlighting areas of collaborations with ASLO programme. Attention will be paid to the issue of climate change, examining the Indicators of Climate Change in Africa's Oceans and the consequences of climate change on Africa's marine biodiversity. ASLO and the new frontiers for African Marine Scientist will be discussed.

Keywords: Biodiversity, Climate Change, Development, Greenhouse gases, Marine

SS82: Emerging Models of Trace Metal Bioavailability to Aquatic Organisms

David Semeniuk, Minnow Environmental Inc. (dsemeniuk@minnow.ca)
Randelle Bundy, University of Washington (rbundy@uw.edu)
Anne Cremazy, U. British Columbia (acremazy@zoology.ubc.ca)

Well established equilibrium-based trace metal bioavailability models for aquatic organisms (e.g., the Free Ion Activity Model and Biotic Ligand Model) have proven useful for predicting the bioavailability and toxicity of metals in aqueous environments for a variety of organisms, from phytoplankton to fish. These models propose that metal bioavailability is proportional to the concentration of the free metal ion in solution. Thus, given enough information about the chemical environment, one can predict metal bioavailability and potential toxicity. Yet, emerging laboratory and field studies indicate that these models do not accurately predict metal bioavailability under all environmentally realistic conditions, such as when salinity and pH varies, when natural organic ligands and bioavailable metabolites are present, and at low trace metal concentrations (as opposed to high concentrations typical of industrial effluents). In light of this, this session seeks new work that explores modified or alternative models for trace metal bioavailability to aquatic organisms, and their ecological implications. We invite research concerning both experimental and biophysical chemical modeling of trace metal bioavailability, including the roles of chemical speciation, kinetic controls on metal bioavailability, and the influence of metal and organic ligand mixtures on metal speciation, bioavailability and toxicity.

Keywords: Contaminant, Lake, Fish, River, Marine, Metal, Nutrients, pH, Phytoplankton, Toxicology

SS83: Sources, Trophic Transfer, and Utilization of Dietary Nutrients in Aquatic Ecosystems: Current status and future challenges

Martin Kainz, WasserCluster Lunz - Biological Station (martin.kainz@donau-uni.ac.at)
Fen Guo, WasserCluster Lunz (fen.guo@donau-uni.ac.at)
Michael T. Brett, University of Washington, Seattle (mtbrett@u.washington.edu)

The acquisition of dietary nutrients is a prerequisite for all consumers. In aquatic food webs, there is a wide range of diet sources that are all based on primary production from terrestrial and aquatic ecosystems to provide energy for consumer growth, reproduction, and survival. In recent years, much has been learned about the identification of diet sources and their trophic transfer in aquatic consumers, mostly through tracers including stable isotopes and lipid biomarkers. However, less is known about the use of dietary nutrients of various sources and how such diets are metabolized in consumers at various trophic levels. The aim of this session is to build a more comprehensive understanding of what regulates the input, alteration, trophic retention, and physiological response of dietary nutrients in consumers within aquatic food webs. We invite talks that, a) study physiological implications of dietary nutrients in consumers at all trophic levels and aquatic ecosystems, b) examine how dietary nutrients of various sources get transferred and retained in food webs of various ecosystems, and, c) scrutinize how the supply and transfer of required dietary nutrients, including essential amino acids and fatty acids, are altered due to human impact and global change.

Keywords: Carbon, Climate Change, Lake, Food Web, Functional Ecology, Marine, Nutrients, Plankton, Stream, Trophic, Zooplankton

SS84: Beyond Natural Variability: Cumulative effects and tipping points in aquatic systems

Edward J Gregr, University of British Columbia (ejgregr@gmail.com)
Kai Chan, University of British Columbia (kaichan@ires.ubc.ca)
Rebecca Martone, Province of BC (rebecca.martone@gmail.com)
Cathryn Clarke Murray, Fisheries and Oceans Canada (Cathryn.Murray@dfo-mpo.gc.ca)

Both marine and freshwater ecosystems are changing dramatically due to a range of human activities and the consequent forcing of coupled ecological processes. The need to ensure that the ecosystem services on which humanity depends remain sustainable is fuelling an increasing interest in resilience, cumulative effects and tipping points. Effective conservation and management will depend on understanding how far we can push these systems, and how we can best enable their recovery if pushed too far. In this session, we welcome papers on the study of tipping points - freshwater or marine systems that have been, or are at risk of, transforming into alternate states, and cumulative effects - how impacts from multiple human activities can influence the composition and structure of communities, potentially affecting their resilience to natural variability and anthropogenic stressors. Because this research has largely focused on either individual, local experiments, or large scale synthetic mapping exercises, we are especially interested in presentations that seek to integrate the scientific understanding of cumulative effects and tipping points into spatial modeling and management. Papers characterizing ecosystem resilience, or that measure the effectiveness of restoration efforts are particularly encouraged.

Keywords: Conservation, Ecosystem Service, Ecology, Sustainable, Modeling, Resilience

SS85: Urban Water Systems and the Blue-Green Horizon: Challenges & Opportunities

Jennifer Cherrier, Brooklyn College-The City University of New York (jennifer.cherrier18@brooklyn.cuny.edu)
Ana Mijic, Imperial College London (ana.mijic@imperial.ac.uk)
Brianne Smith, Brooklyn College-CUNY (brianne.smith43@brooklyn.cuny)

Over the past century, population growth, development and land use changes have significantly undermined the reliability of many urban water systems around the globe. The aging infrastructure of many of these urban areas coupled with extreme climate events exacerbate environmental problems such as urban water security, stormwater runoff, flooding, and water quality degradation. The global population is projected to reach 9.725 billion by 2050 and by this time, approximately 66% of the world's population will reside in urban areas so all of these issues are likely to get worse unless adequately addressed. Challenges confronting urban water systems have recently given rise to a transition from centralized aging grey infrastructure toward sustainable integrated water systems. This transition is referred to as a "One Water Approach" where drinking water, stormwater, and wastewater systems are all treated as a potential resource and managed via aligned and coordinated activities. Decentralized technologies, such as green infrastructure and blue-green systems, are among most promising solutions for this transition because they foster both resource management and integrated approaches. This session will explore some of these blue-green engineering solutions together with the technological, governance and societal challenges and opportunities for their implementation in cities around the world.

Keywords: Development, Hydrology, Land Use, Sustainable, Resilience

SS86: Connecting the Dots: Signals of Global Change Effects in Freshwater and Marine Ecosystems

John F. Schalles, Creighton University (JohnSchalles@creighton.edu)

Investigators and resource managers are noticing and documenting state changes in aquatic ecosystem properties in diverse inland and marine locations. In many cases, these observations are based on longer-term (decadal scale) measurements. This session seeks to bring together individuals with stories to tell about their research and management sites and suspected or demonstrated linkages of ecosystem components to global change drivers. We also encourage presenters to offer future projections and thoughts on societal strategies to adapt to and, or actively mitigate adverse impacts. The session will conclude with a panel-led, integrative discussion to compare and contrast findings and search for common threads across diverse aquatic systems.

Keywords: Climate Change, Ecosystem, Lake, Marine, Wetland

SS87: Cyanobacteria in Inland Waters: New monitoring, reporting, modelling and ecological research

Tsuyoshi Kobayashi, Office of Environment and Heritage NSW (yoshi.kobayashi@environment.nsw.gov.au)
Simon Mitrovic, UTS, Sydney (simon.mitrovic@uts.edu.au)

Cyanobacterial blooms (either toxic or non-toxic) are anticipated to expand and change their distribution, frequency and intensity in inland waters (such as rivers, lakes and wetlands) with increasing global warming and climate change. In addition to traditional methods (e.g. water sample collection followed by microscopic identification and counts of cells, colonies or filaments), there are now diverse scientific tools available for monitoring, reporting, modeling and research on cyanobacteria ecology (e.g. molecular techniques, high-frequency data loggers, GIS-mobile-phone based apps). Such tools can help not only expand our research capabilities but also unite local communities through citizen science programmes. Further, the expanded monitoring of toxins within waterways may give further insights into risks and management. This session encourages papers that focus on aspects of new monitoring, reporting, modeling and ecological research on cyanobacteria in inland waters.

Keywords: Climate Change, Cyanobacteria, Ecology, Lake, River, Modeling, Wetland

SS88: Unlocking the Potential of Earth Observation in Coastal Lagoons and Estuaries

Martin Le Tissier, Future Earth Coasts (FEC) (martin.letissier@ucc.ie)
Dr Eirini Politi, Univer College Cork (eirini.politi@ucc.ie)
Andrew Tyler, University of Stirling, UK (a.n.tyler@stir.ac.uk)

Coastal lagoons and estuaries (CL&E) are hotspots of human settlement and activities, influenced by both land input and interaction with the sea. They have a complex biophysical structure whilst representing highly dynamic and productive ecosystems, However, their setting within the coastal landscape renders them vulnerable to shifts in physical and ecological characteristics from global environmental change, including climate change and anthropogenic activity, but our understanding of how they respond to change globally is limited. This understanding is necessary for the sustainable management of CL&E, and their ecosystem services, and assess the socio-environmental implications of future development in the context of global change. Management of CL&E is made difficult by virtue of the challenges in acquiring spatially and temporally explicit data that identify the dynamics of fluxes and change to water bodies. Earth Observation (EO) coupled with in-situ data provides a means to address these challenges, but considerable knowledge gaps exist in exploiting the full potential of EO in CL&E research. To address this issue, this session invites papers that cover (a) CL&E monitoring and management issues, (b) the potential of EO for CCL&E monitoring and management, and (c) challenges posed and potential solutions towards future research in CL&E.

Keywords: Climate Change, Development, Ecosystem, Estuary, Sustainable

SS89: Shallow Urban Lakes: Dynamics and Management

Brett F. Branco, Brooklyn College (bbranco@brooklyn.cuny.edu)
Anas Ghadouani, U Western Australia (anas.ghadouani@uwa.edu.au)

Shallow urban lakes continue to present challenges for both scientists and managers. Tightly coupled physical, chemical, biological and human dynamics produce rapid changes, surprises, and unintended consequences to management interventions. These systems are often managed for aesthetics and recreational functions and yet can also serve important ecosystem functions within the urban landscape. This session invites contributions that provide new insights on the fundamental understanding of shallow urban lakes that can lead to their sustainable management. Topics could include but are not limited to ecosystem services and functions within the urban landscape; successful and unsuccessful management actions; new insights on their biogeochemistry, ecology and external drivers, including climate change and enrichment of nutrients; and connections between shallow urban lakes and society.

Keywords: Biogeochemistry, Ecosystem Service, Ecology, Lake, Sustainable, Nutrients

SS90: Frontiers in Aquatic Respiration

Matthew Cohen, University of Florida (mjc@ufl.edu)
Robert Hall, Flathead Bio Station (bob.hall@flbs.umt.edu)
Lily Kirk, University of Florida (lily33@ufl.edu

Ecosystem respiration (ER) is the integral measure of biotic energy throughput, and is thus informative for understanding how ecosystems function and predicting how they will change with altered forcing. Inference of ER from dissolved oxygen signals in aquatic ecosystems has been standard practice for over 60 years, but remains both technical and conceptually challenging. This session invites contributions on ecosystem respiration in aquatic systems, emphasizing methodological improvements to ER estimation particularly with respect to physical parameter estimation, intrinsic limitations of ER inference (e.g., neglecting anaerobic respiration), and synthesis efforts exploring thermal, hydrologic, redox and substrate controls on ecosystem energetics.

Keywords: Carbon, Hydrology, Oxygen, Production, Respiration

SS91: We're all in a hurry to do "policy relevant"¯ research. Where is it all going?

Stephen L Katz, Washington State University (Steve.Katz@WSU.edu)
Mark D Scheuerell, NOAA-NMFS (Mark.Scheuerell@NOAA.gov)

There is increasing pressure for scientists to better justify how publicly funded research produces goods and services that are valuable to society. As aquatic ecologists, we often claim a strong connection between our work and solutions to various environmental problems, such as adequate clean water and sustainable fisheries. Indeed, nearly every grant application contains a section explaining how the proposed research will inform management decisions or otherwise provide much needed information. Despite an abundance of guidance on how to make our work increasingly "policy relevant"¯ and "actionable," opportunities for direct interaction with natural resource managers are typically very limited. Without this feedback, necessary adjustments or redirection of efforts are missed or slow to evolve. Thus, we contend that the research community may not be in the best position to determine what is policy relevant a priori. This session will pair decision makers with researchers to examine the perceived boundaries between them and evaluate some successes and failures of ostensible policy relevance. From these comparisons, we anticipate the emergence of a better understanding of those diagnostics likely to forecast success.

Keywords: Conservation, Ecosystem Service, Resource, Outreach, Policy

SS92: The Ecological Consequences of Evolution and Phenotypic Plasticity in Aquatic Ecosystems

Rana El-Sabaawi, University of Victoria (rana@uvic.ca)
Andres Lopez-Sepulcre, Centre National de la Recherche Scientifique (alopez@biologie.ens.fr)
Sarah Collins, University of Wisconsin (scollins23@wisc.edu)
Steve Thomas, University of Nebraska-Lincoln (sthomas5@unl.edu)

Eco-evolutionary dynamics describe the interactions and potential feedbacks between ecological and evolutionary processes. Studies on eco-evolutionary dynamics have shown that intraspecific phenotypic (and genetic) variation can alter ecological processes at the level of the individual, population, community or ecosystem. These studies have also revealed that the evolutionary processes governing this variation can occur on contemporary timescales, making them particularly relevant for forecasting ecological dynamics under rapid environmental change. Therefore, eco-evolutionary dynamics are an important facet of how organisms and ecosystems respond to landscape change, over-harvesting, climate change, or species invasion. Much of the recent progress in eco-evolutionary dynamics has occurred in freshwater ecosystems, which have seen the emergence of model systems in the discipline. We invite submissions covering all aspects of eco-evolutionary dynamics in aquatic ecosystems, regardless of their approach (experiment vs. observation), scale (genetic or individual to ecosystem), taxon or ecosystem. We especially encourage studies that link experimental or observational studies with theoretical models.

Keywords: Not specified

SS93: Phytoplankton

SS94: Zooplankton

SS95: Fish

SS96: Acidification

SS97: Aquatic Invasion Ecology

SS98: Hypoxia

SS99: Lotic Ecosystems

SS100: Food Web Interactions and Trophic Linkages

SS101: Communicating Science to the Public