Special Session Abstracts SS16-SS30
Sessions 01 - 15 | Sessions
16 - 30 | Sessions
31 - 46
SS16 - Transport and
transformation of DOM from land to sea
Wilhelm Graneli (Wilhelm.Graneli@limnol.lu.se),
Ecology Building, Limnology, A-223 62 Lund, Sweden. Fax: +46 46-2224536
Lars Tranvik (Lars.Tranvik@limno.uu.se),
Dept. of Limnology, Uppsala University, Norbyvagen 18D, 752 36
Uppsala, Sweden
A fraction of the organic matter originating in terrestrial primary
production is lost to aquatic ecosystems as dissloved organic matter
(DOM). This DOM can be a major source of energy and nutrient for aquatic
food webs. During its transport from soil to sea, allochthonous DOM
is subject to a variety of transformations (biological, photochemical,
sedimentation) which affect the quality and quantity of DOM reaching
coastal waters where mixing into saline water induces further transformation.
Allochthonous DOM also has substantial effects on the structure and
function of aquatic ecosystems. This session will focus on the DOM
transfer from land to sea, emphasizing mechanisms involved and their
ecosystem effects, as well as regional and global implications of
this transfer.
SS17 - Approaches to regional monitoring and
assesment of surface water quality
Spencer A. Peterson (peterson@mail.cor.epa.gov),
US Environmental Protection Agency, National Health and Environmental
Effects Research Laboratory, Western Ecology Division, 200 SW 35th
Street, Corvallis, OR 97333 USA. Telephone: (541)754-4457. FAX: (541)754-4716
Richard K. Johnson (Richard.Johnson@ma.slu.se),
Swedish University of Agricultural Sciences, Department of Environmental
Assessment, P.O. Box 7050, Uppsala, S-750 07 Sweden. Telephone: +46
18 673127, FAX: +46 18 673156
Monitoring and surveillance programs have, in the past, often dealt
with site-specific questions of ecosystem condition, thus concentrating
on single populations or communities of individual habitats or ecosystems.
For example, sites often are monitored for nutrient levels, frequency
of algal blooms, fish species present, etc. However, present day pressures
on aquatic systems affect large geographic areas. Thus, it has become
increasingly important to be able to describe water resources condition
over these broad areas or regions. Most regional assessment approaches
originate from the premise that ecosystem properties reflect the variation
of the surrounding landscape. Thus, ecosystem indicator properties,
when accurately compiled, permit greater focus on regional scale-
as opposed to site-specific scale, aquatic resource management issues.
Recent developments in statistical sampling designs, ecoregion landscape
classification, and TM and AVHRR technologies coupled with GIS capabilities
and other techniques make it possible to compile regional environmental
resource estimates in ways that did not exit a short time ago. Abstracts
directed toward this Special Session should focus on census, survey,
modeling, and any other procedures designed to describe, infer, or
extrapolate lake, riverine, or wetland processes, status, and trends
across temporal, spatial and biological scales (boundaries). Presentations
will include a variety of innovative, regionally oriented monitoring
and assessment topics and case studies of interest to both the research
and aquatic resource management communities.
SS18 - Integrating river basins: linking fluxes
between catchments, rivers and estuaries with numerical models
David Hamilton (hamilton@cwr.uwa.edu.au),
Department of Environmental Engineering, Centre for Water Research,
University of Western Australia, Nedlands WA 6907 AUSTRALIA Tel: +61-8-9380-3530,
Fax: +61-8-9380-1015
Paul Bukaveckas (pabuka01@athena.louisville.edu),
Department of Biology, University of Louisville, 328 Life Sciences
Louisville, KY 40292, Phone: +1 502-852-3726, FAX: +1 502-852-0725
This session will be a forum for ecologists, hydrologists and numerical
modelers who wish to understand and predict how large river basins
function. The focus will be on linking biogeochemical and hydrologic
processes that regulate the fluxes and transformations of organic
carbon and nutrients. Management perspectives on how to modify or
interrupt flux paths within the basin to beneficially influence downstream
water quality will also be considered. Numerical modeling has proven
to be a valuable approach for integrating biotic activities in the
context of physical-hydrologic processes. What are the prospects for
linking models of watershed runoff, riverine transport and biogeochemical
cycling? Are large river basins amenable to this approach or are they
too complex, chaotic and non-linear for predictive analyses? What
are the key ecological processes that determine the quantity and quality
of downstream fluxes of carbon and nutrients?
SS19 - Lakes in flood-pulsed environments
A. D. Buijse (a.d.
buijse@riza.rws.minvenw.nl),
B. Ibelings (B.ibelings@riza.rws.minvenw.nl),
RIZA Inst. for Inland Water Management and Wastewater treatment, P.O.
Box 17, 8200 AA Lelystad, The Netherlands. Fax: +31 320 249218
Situated in the floodplains or deltas of large rivers, aquatic communities
of shallow lakes are to a vatying degree steered by the hydrological
regime of the river. In lowland rivers, such as the rivers Rhine,
Danube and Kissimmee, restoration focusses on the aquatic-terrestrial
transition zone between floodplains and the main channel by reintroducing
the natural flooding process. Floodpulses set back the autogenic succession
and "rejuvenate" the plankton, macrophytes and fish communities. In
the session we propose to unravel the role of inundation frequency
and water level fluctuations in conjunction with "classical" determinants
of lake ecosystem development like morphometry and trophic state.
SS20 - The role of aquatic macrophytes in lakes
(invited)
Erik Jeppesen (EJ@dmu.dk) National
Environmental Research Institute, Vejlsøvej 25, Post Box 314, 8600
Silkeborg, Denmark. Tel: +45 89201400 Fax: +45 89201414
Aquatic macrophytes play a major role in structuring lake ecosystems,
particularly in shallow lakes. The plants act as a buffering zone
between the terrestrial and the pelagic environment , although the
plants during autumn may act as a major source of nutrients and organic
matter to the pelagial. Aquatic plants are inhabited by other autotrophic
components, invertebrates, fish and birds and may therefore enhance
biodiversity. In addition, plants provide a shelter for invertebrates
and fish against predators. In some lakes, major seasonal and diel
migration of invertebrates and fish occurs between the plant beds
and the pelagial. Such migration may have strong cascading effects
on the entire food web and ultimately on lake water quality. This
session focuses on the recent development within this growing field
of research with special emphasis on how interactions between plant
beds and the pelagial change along a gradient in nutrients and salinity.
SS21 - Aquatic species invasions
David Reid (reid@glerl.noaa.gov),
NOAA/Great Lakes Environmental Research Laboratory, 2205 Commonwealth
Blvd., Ann Arbor, MI 48105-2945 USA. Tel. 734-741-2019; FAX 734-741-2003
Hugh MacIsaac (hughm@uwindsor.ca),
Great Lakes Institute for Environmental Research, University of
Windsor, Windsor, Ontario N9B 3P4. Tel. 519-253-3000 ext. 3754; Fax
519-971-3609
Gregory M. Ruiz (ruiz@serc.si.edu),
Smithsonian Environmental Research Center, P.O. Box 28, Edgewater,
Maryland 21037 USA. Tel. 301-261-4190; Fax 301-261-7954
The problem of species invasions is growing in recognition as a problem
that threatens the biodiversity of ecosystems on a global scale. This
Special Symposium will cover a broad array of relevant, interrelated
topics concerning aquatic species invasions that should be of interest
to the marine, estuarine, and freshwater scientific communities. We
seek contributions for the following special focus topics: patterns
of invasion in space and time; transfer and invasion of microorganisms
in aquatic systems; nonindigenous aquatic species and their interactions
with invaded ecosystems; risk assessment and predictability of bioinvasions;
understanding invasion pathways; control and management of invasive
species; and international government policies and institutional arrangements
for dealing with aquatic invasive species. Several sub-sessions are
possible, depending on the number of contributions for each of these
topics. In addition, a lunchtime or evening workshop on Invasive Species
Databases will be conducted (see workshop announcements). Contributors
should identify for which of the above listed special focus topics
they would like to be considered.
A related pre-conference Workshop titled "Invasion of European &
North American Ecosystems by Ponto-Caspian Species" will be held Friday
and Saturday, June 2-3, 2000, just prior to the start of the main
ASLO 2000 Conference. Presentations are by invitation only, but individuals
interested in the workshop are welcome to attend and should indicate
their interest in doing so. See workshop announcements. Please contact
any of the conveners for more information.
SS22 - Quantitative links between past and present
- paleolimnological contributions to contemporary process studies
N. John Anderson (nja@geogr.ku.dk),
Department of Geography, University of Copenhagen, Oester Voldgade
10, DK-1350 Copenhagen K, Denmark. Tel. : (int + 45) 35 32 25 22 (direct),
Fax : (int + 45) 35 32 25 01
Daniel R. Engstrom (dre@tc.umn.edu
or dengstrom@smm.org), St.
Croix Watershed Research Station, Science Museum of Minnesota, Marine
on St. Croix, MN 55047. 651-433-5953 (phone), 651-433-5924 (fax)
The limited timescale of contemporary monitoring and experimental
studies of lakes, means that there is a clear role for palaeolimnology
in extending our knowledge of e.g. natural variability. Palaeolimnological
data can be used to determine whether the inherent temporal variability
of processes has been altered substantially with anthropogenic disturbance.
However, to link across the different timescales of neo- and sediment
records, palaeolimnologists must utilize the information contained
in lake sediments in a more rigorous fashion. The session will cover
a range of applied issues: eutrophication, atmospheric deposition,
erosion, climate change - and illustrate the increased effort towards
quantifying the magnitude/rates of change and mechanistic linkages
to modern-day processes.
SS23 - The recovery of freshwater ecosystems
from acidification: the role of air, land and sediment boundaries
Norman Yan (yanno@ene.gov.on.ca),
Ontario Ministry of the Environment, Dorset Environmental Science
Centre, Dorset, Ontario, Canada, P0A 1E0. Phone: 705 766-2418, FAX
705 766-2254
John Gunn (jgunn@nickel.laurentian.ca),
Ontario Ministry of Natural Resource, c/o Biology Department, Co-operative
Freshwater Ecology Unit, Laurentian University, Sudbury, Ontario,
Canada P3E 2C6. Phone: 705 675-4831, FAX 705 671-3857
Given the recent large SO2 emission reductions in Europe and in North
America, the focus of acid rain research has shifted from damage estimation
to the recovery process. We have only a nascent understanding of the
rate, degree and regulators of water quality improvement and the re-assembly
of damaged aquatic communities. Central to the study of recovery is
research on the changes in fluxes of both materials and organisms
(i.e. colonists) across limnological boundaries. We invite contributions
that quantify these fluxes, both chemical and biological, especially
those that link the fluxes to the limnological recovery process.
SS24 - Sustainable use and management of international
fresh waters
Maria José Lemos Boavida (zboavida@fc.ul.pt),
Universidade de Lisboa. Portugal
Because ecological systems are natural and do not conform to (artificial)
political boundaries, freshwater ecosystems are often shared by two
or more countries, thereby creating a need to establish rules for
their sustainable use and subsequent management. Traditionally four
doctrines of International Law have been providing the rules for the
utilization of shared water resources; since those doctrines followed
each other historically, they reflect the successive ways of looking
at problems generated by sharing of critical water resources. Sustainability
is closely related to security and it often results in disputes over
international waters. Interdisciplinary collaboration (limnologists,
hydrologists, geologists, sociologists, lawyers), as well as public
participation, are mandatory in the elaboration of international conventions
which should be tools for cooperation, bound to the principles of
International Law for sustainable water resources utilization.
SS25 - Ecological processes and ecosystems:
functioning towards water purification
Sergei A. Ostroumov (saostro@glasnet.ru),
Dept. of Hydrobiology, Moscow State University, Moscow, 119 899,
Russia
Steve McCutcheon, US EPA
Christian Steinberg, Berlin, Inst. of Freshwater Ecology and Inland
Fisheries
The focus is on how do ecosystems and organisms (microorganisms, plants,
animals) upgrade the quality of water and contribute to making it
pure and clear, removing organic matter, xenobiotics/contaminants
and extra nutrients (P, N) and performing natural bioremediation.
All processes contributing and leading to that, e.g. biotransformation,
oxidation, adsorption, accumulation, filtration, and sedimentation
in ecosystems, mesocosms and laboratory systems. Roles of wetlands,
plankton, benthos, periphyton - (all marine and freshwater) organisms
and their enzymes - including bacteria, cyanobacteria, algae, fungi,
protozoans, higher plants, and invertebrates.
SS26 - Role of aquatic colloids in the speciation,
bioavailability and fate of trace elements, nutrients and contaminants
Peter H. Santschi (santschi@tamug.tamu.edu),
Dept. of Oceanography, Texas A&M University,5007 Avenue U, Galveston,
TX 77551, USA
Kevin J. Wilkinson (kevin.wilkinson@cabe.unige.ch),
CABE, Analytical and Biophysical Environmental Chemistry, University
of Geneva, Sciences II, 30 quai Ernest-Ansermet, CH-1211 Geneva 4,
Switzerland
Recent advances suggest that the speciation, bioavailability and fate
of trace elements, nutrients and contaminants in aquatic systems (both
fresh and marine) can be closely linked to that of colloidal materials,
which are mainly composed of macromolecular organic matter (mostly
carbohydrates, proteins and humic substances) and mineral colloids
in freshwaters. Aquatic colloids display excellent complexation capacity
due to their polyfunctional properties. Contrary to low molecular
weight ligands, however, macromolecular organic matter can coagulate
and remove with it bound trace metals, radionuclides and trace organic
contaminants from the water column. This session should bring together
limnologists and oceanographers studying physical, chemical, microbiological
and environmental aspects of aquatic colloids.
SS27 - I. Climate change, weather patterns and
aquatic systems
Stephen C. Maberly (scm@ife.ac.uk),
Institute of Freshwater Ecology, Windermere, UK. Fax:+1539446914
Jean-Pierre Gattuso (gattuso@obs-vlfr.fr),
Observatoire Oceanologique, Villefranche-sur-mer, France. Fax+493763834
The water surface defines the boundary between the atmosphere and
aquatic systems but does not prevent interaction between them. Noteworthy
effects of the atmosphere on the functioning of aquatic ecosystem
include global change, such as rising concentrations of CO2 in the
atmosphere, stochastic extreme weather events and pseudo-cyclical
large-scale weather patterns such as the North Atlantic Oscillation.
The aim of this special session is to review current ideas on the
sensitivity of freshwater and marine systems to atmospheric perturbation
and elucidate the consequences for ecosystem function.
SS27 - II. Climate variation, regime shifts
and fisheries: lessons from the Atlantic and Pacific
Dr. Jeffrey J. Polovina (Jeffrey.Polovina@noaa.gov),
Honolulu Laboratory, SWFSC, NMFS,NOAA, 2570 Dole St., Honolulu,
HI 96822-2396 USA
Dr. Keith Brander (Keith@ices.dk),
ICES/GLOBEC Secretary, Palaegade 2-4, 1261 Copenhagen K, Denmark
Understanding how physical variation in the ocean impacts population
dynamics of important fisheries resources is the focus of considerable
attention in both the Atlantic and Pacific basins. Insights into physical-fisheries
links are being developed from basin-scale data sets collected from
satellite remote sensing, ocean models, moored arrays. The recent
strong El Nino and La Nina has provided important physical contrasts
in the system to evaluate some of these linkages. Historically, fisheries
management in the Pacific has emphasized the importance of climate
variation as a factor in fisheries dynamics while in the Atlantic
the focus has frequently emphasized exploitation. What are the current
perspectives on physical variation and its impacts on fisheries in
the Atlantic and Pacific? Are there regime shifts which are coherent
between the two ocean basins so a global perspective improves our
ability to detect regime shifts? This session solicits presentations
on physical- ecosystem links and implications for fisheries management
from research in the Atlantic and Pacific. Furthermore papers which
take a comparative or global perspective on these linkages are also
encourage.
SS30 - What is controlling the distribution
of seagrasses?
Ole Pedersen (olep@ibm.net), Freshwater
Biological Laboratory, University of Copenhagen, Helsingørsgade 51,
DK3400 Hillerød, Denmark
Marianne Holmer (holmer@biology.sdu.dk),
SDU-Odense University, Campusvej 55, DK5230 Odense M, Denmark.
The value of seagrasses as structuring elements of coastal ecosystems
can hardly be overestimated, and over the years a substantial knowledge
about general seagrass ecology has accumulated. Grey spots exist in
the literature, however, when it comes to the understanding of sudden
large-scale die backs and the subsequent unsuccessful recolonisation.
Although the apparent environmental key factors should allow regrowth
of the seagrasses, large areas remain unvegetated and restoration
projects are often initiated. Many of these projects have only been
partly successful, probably because the understanding of primary growth
conditions in, for example, the sediment is inadequate. New experimental
tools provide us with the opportunity to do detailed studies of the
seagrass rhizosphere, and this has at some occasions inverted existing
hypotheses. The aim of this session is to present new learnings about
temperate and tropical seagrasses with special emphasis on the importance
of the environment for the distribution and recolonization of seagrasses
and the impact of the biogeochemical cycles of seagrass sediments.
Sessions 01 - 15 | Sessions
16 - 30 | Sessions
31 - 46
