2003 ASLO Aquatic Sciences Meeting

Sub-theme 1: Historical Studies in Aquatic Sciences

Plenary presentation by Sherri Fritz, Department of Geosciences, University of Nebraska

Sub-theme 1 Organizers: Nina Caraco (caracon@ecostudies.org) and Val Klump (vklump@uwm.edu)

Human activities have altered the Earth’s hydrosphere, biosphere and atmosphere. Documenting the impacts on, and the response(s) of, aquatic ecosystems to anthropogenic forcing is necessary both to understand past and present dynamics and to sustain aquatic environments and the resources they provide in the future. This sub-theme aims to cover a broad range of historical studies in aquatic sciences, including water quality and nutrient regimes, primary and secondary production, fisheries, harmful algal blooms, biodiversity, freshwater flow (surface and groundwater), dams and impoundments, watershed alteration and development, aquaculture, and invasive species.

SS1.01 Saline Lakes: Responses to Anthropogenic Forcings and Appropriate Management Strategies
Organizers: Robert Jellison (jellison@lifesci.ucsb.edu) and Wayne Wurtsbaugh (wurts@cc.usu.edu)

Saline lakes are widely recognized as highly productive aquatic habitats, harboring specialized assemblages of species and often supporting large populations of both migrating and breeding birds. The integrity and productivity of many saline lakes are threatened by ongoing human activities. With the looming freshwater crisis, many will be further imperiled as inflowing surface waters are diverted for human uses. This session will address lake responses to various anthropogenic forcings and examine appropriate management strategies.

SS1.02 Coastal Indicators of Water Quality and Ecological Condition
Organizers: Hans W. Paerl (hans_paerl@unc.edu) and Gerald J. Niemi (gniemi@nrri.umn.edu)

Estuarine and coastal waters are experiencing ever-increasing human- and naturally-induced change. This session will address the development and application of indicators capable of assessing ecological condition and change in coastal waters over a range of scales from individual habitats to regions. The US Environmental Protection Agency (EPA) is supporting the Estuarine and Great Lakes Ecological Indicators (EaGLe) Program, which includes the coastal Atlantic, Gulf of Mexico, Pacific and Great Lakes regions. Complementary efforts are underway worldwide. The session will address indicators capable of addressing different levels of biological complexity, ranging from subcellular (molecular) to population, community, ecosystem and regional scales. A major objective is to incorporate these indicators into long-term environmental research and monitoring programs. The resulting indicators must be sensitive, quantitative, and capable of being implemented to measure ecological change over a wide variety of spatial and temporal scales. Moreover, the template of coastal regions and their respective watersheds to which the indicators must be applied varies immensely in terms of hydrology, climate, and topography. The integration of both human and natural stressors with the relevant environmental responses is a tremendous challenge. Many efforts are also under way to link indicators with remote sensing in order to “scale up” their application to large coastal regions not amenable to time- and space-intensive sampling. Development, testing, interpretation, and application of these indicators will be discussed using a range of biotic and ecosystem responses with associated stressors for representative coastal regions of the world.

SS1.03 Groundwater/Surface Water Interactions
Organizers: Stephen Opsahl (sopsahl@jonesctr.org), Matthew A. Charette (mcharette@whoi.edu), and Kevin Kroeger (kkroeger@whoi.edu)

Human activities have altered the interactions of groundwater and surface waters. This session will highlight recent advances in our knowledge of the pathways (including spatial and temporal patterns) of groundwater flow, biogeochemical transformations, and biological implications at groundwater/surface water interfaces. Such environments include groundwater discharge areas in coastal zones, hyporehic zones of streams and rivers, karst landscapes, or any area where surface water/groundwater mixing occurs. Approaches may involve natural tracers of groundwater discharge, microbial process studies, hydrological modeling, or novel in situ instrumentation. We especially seek multi-scaled and multi-disciplinary contributions that provide perspectives relating to historic changes as a result of anthropogenic impacts or the effects of changing climate on groundwater/surface water dynamics.

SS1.04 Impacts of Changing Land Use on Aquatic Ecosystems
Organizer: G.S. Kleppel (gkleppel@albany.edu) and M.R. DeVoe (rick.devoe@scseagrant.org)

The population on the coastal plain of the United States is increasing rapidly and this trend is likely to intensify in the future. Land use patterns are changing 1.5 times more rapidly along the coasts than in the interior of the nation. Rural and natural landscapes are being converted to energy-, population- and infrastructure-intensive urban use at the rate of ca. one million acres per year in the US. Because land use is considered among the principal determinants of water quality and biological diversity, such changes will likely have substantive impacts of aquatic ecosystems. Research has linked changing land use patterns to habitat disruption, eutrophication (and its effects) and toxic contamination at local to watershed scales. However, the mechanisms underlying these impacts are often elusive. The purpose of this session is to explore the relationship between land use and ecosystem integrity, giving particular attention to the mechanisms (causes) by which changes in land use patterns are translated into specific impacts (effects) on specific time and space scales. Presentations will address the nature and scales of land use change, the results of current research within the context of system dynamics (e.g., surface and subsurface flows) and possible scientific and policy mechanisms for effectively managing the ecological challenges arising in rapidly developing coastal regions.

SS1.05 The History and Current Status of Eutrophication in Freshwater and Marine Ecosystems
Organizers: Val Smith (vsmith@ku.edu), Mandy Joye (mjoye@arches.uga.edu), and Robert Howarth (rwh2@cornell.edu)

Cultural eutrophication is an environmental issue of global concern. Human mobilization of nitrogen and phosphorus from the landscape to surface waters causes the nuisance growth of algae and a wide array of eutrophication-associated problems in both freshwater and marine ecosystems. In addition to normal contributed papers, we will invite a set of internationally recognized experts in eutrophication who will present their own personal overviews of the history and current status of eutrophication from a broad array of rivers, lakes, estuaries, and coastal marine ecosystems located world-wide. It is intended that this session will provide a forum in which the participants can document and discuss the general applicability of eutrophication concepts and management strategies across diverse aquatic systems.

SS1.06 Carbon Cycles in Large Lakes
Organizers: Tom Johnson (tcj@d.umn.edu) and Val Klump (vklump@uwm.edu)

Attempts to balance the carbon inputs and outputs in large lakes are futile at present. Measurements of respiration in the water column, coupled with estimates of CO2 evasion, far outweigh our current estimates of primary productivity and allochthonous input of carbon in lakes ranging from Superior to Malawi. This session will address all aspects of the carbon cycle in large lakes, ranging from primary production to long-term variations in carbon burial rates.

SS1.07 Symposium Tribute to John J. Gilbert: 40 Years of Contributions to Limnology
Organizers: Jeff Jack (jeff.jack@louisville.edu) and Craig Williamson (cew0@lehigh.edu)

Prof. John J. Gilbert of Dartmouth College has made contributions of remarkable import to limnology for more than 40 years. While best known for his foundational and ground-breaking work on the Rotifera, John’s work has opened the way to new directions in areas ranging from benthic invertebrates especially freshwater sponges and interactions between insects and zooplankton to the effects of toxic phytoplankton on pelagic community structure. In addition to his prolific scientific productivity, John has mentored more than a dozen Ph.D. students and scores of undergraduates. The combination of these widely-ranging professional efforts have already had, and will continue to have, a lasting impact on the aquatic sciences. Upon the occasion of his retirement, this symposium will focus on insights and new discoveries pioneered by Prof. Gilbert and their implications for the understanding of the structure and function of aquatic food webs.

SS1.08 Leave No Scientist Behind: How to Get Aquatic Sciences Into K-12 Classrooms
Organizers: Lesley K. Smith (smithlk@cires.colorado.edu) and George I. Matsumoto (mage@mbari.org)

This session will provide basic information about education outreach and highlights innovative programs involving both freshwater and marine systems. The session will start off with a general tutorial, two invited speakers, a limnologist and an oceanographer, will describe their innovative mission-related outreach projects. We encourage submission of abstracts that highlight to the Society that scientists are making important contributions to education outreach by partnering with educators and bringing aquatic science into the classroom.


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