2003 ASLO Aquatic Sciences Meeting

Sub-theme 2: Paleo Studies in Aquatic Sciences

Plenary presentation by Don Canfield, Institute of Biology, University of Southern Denmark

Sub-theme 2 Organizers: Carmen Aguilar (aguilar@uwm.edu) and Philippe Van Cappellen (pvc@geo.uu.nl)

The study of aquatic ecosystems over geologic time scales provides insight to the vital interactions that drive global-scale patterns of climate and biotic evolution at micro and macro scales. This sub-theme will encompass paleo studies in the context of the evolution of biogeochemical cycles and aquatic biota, glacial-interglacial cycles, ocean-atmosphere dynamics, mass extinctions, and global change.

SS2.01 The Limits to Paleolimnology? Linking Sedimentary Records with Contemporary Process-based Studies
Organizers: Daniel Engstrom (dengstrom@smm.org) and Richard Battarbee

Paleolimnology has made substantial progress over the last 20+ years and contributes substantially to environmental management debates in areas as diverse as atmospheric deposition, eutrophication, erosion, and climatic change. It has contributed to much lesser extent to questions about ecological variability. Progress has centered on quantification via weighted averaging models, better problem formulation and recently, the use of variance partitioning to separate/identify the different forcing factors controlling lakes and sediment signals. Comparisons of long-term monitoring data and high-resolution sediment records, considerations of with-in lake heterogeneity, and the use of experiments to quantify sedimentary proxies all demonstrate that there is a considerable amount of ecological signal retained by lake sediments. Yet at high temporal resolution, it is apparent that often we can explain much less than 50% of the ecological variability recorded by lakes. Only a few limnological variables can be reconstructed with any reliability, and dating resolution severely limits our ability to cross-validate sedimentary sequences with instrumental records. Thus, a sound theoretical basis is required together with a more complete understanding of the limits to the methodology. This session invites papers that explore (and transcend) present-day limits to paleolimnology through novel approaches that test the validity of historical reconstructions, link sedimentary records with contemporary process-based studies, and integrate modeling (in all its forms—statistical, simple empirical and complex, dynamic mathematical models) with paleolimnology.

SS2.02 Lacustrine Hydrology Past and Present: Linking Lakes, Catchments, Atmosphere, and Ocean
Organizer: Sherilyn C. Fritz (sfritz2@unl.edu)

The hydrologic cycle links lakes with their catchments, with the atmosphere, and with the oceans as the major source of convection. This session will focus on the hydrology of lakes, past and present. It will include talks on contemporary hydrologic processes, such as groundwater—lake interactions, catchment hydrology and its impacts on lakewater chemistry, climatic impacts on lacustrine water budgets and chemistry, as well as talks on lacustrine paleohydrology, which reconstruct the magnitude of hydrologic variation in the past and its proximate and ultimate drivers.

SS2.03 The Evolution, Ecology and Biogeochemical Impacts of Plankton from the Paleozoic to the Present
Organizers: Elena Litchman (litchman@imcs.rutgers.edu) and Antonietta Quigg

Study of the historical origins of plankton and the environmental conditions that led to their selection, radiation, and ecological success can provide insights into the feedbacks between plankton and ecological and biogeochemical processes in the present and future oceans. Why have diatoms and coccolithophorids been so ecologically successful? What does their evolutionary history tell us about the history of Earth and the ability of plankton to accommodate to change in the future? What are the most important components of the relationships between zooplankton and phytoplankton? What is their impact on biogeochemical cycles and the rest of aquatic biota? Research that utilizes geological, molecular biological, ecological, and/or modeling approaches to infer the evolution of plankton, describes the present patterns, and predicts future scenarios will be considered in this symposium.

SS2.04 Nitrogen Paleo-Biogeochemistry
Organizers: Joseph P. Montoya (j.montoya@biology.gatech.edu) and Mark A. Altabet (maltabet@umassd.edu)

The nitrogen cycle is dynamic and variable on a broad range of time scales and is intimately linked to other major elemental cycles as well as climate change. Understanding past behavior of the nitrogen cycle provides important insights into its modern and future functioning. We anticipate that this session will include papers focusing on both regional and global variability in the N cycle on decadal to millenial time-scales. Approaches will likely range from those exploiting sediment-based proxies (e.g N isotopes) to model simulations. This session should be of great interest to biogeochemists, paleoceanographers/limnoligists as well as biologists/oceanographers/limnologists working on present-day nutrient dynamics.

SS2.05 Geologic Record of Phosphorus Cycling
Organizers: Ellery Ingall (ingall@eas.gatech.edu) and Caroline Slomp (slomp@geo.uu.nl)

On geologic time scales, dissolved phosphorus availability in seawater is an important control on the productivity of the oceans. Phosphorus driven variations in marine productivity play a key role in cycles of many major elements and global change. Submission of abstracts that focus on paleo phosphorus cycling and its consequences as revealed by studies of the sedimentary record and modeling are encouraged. In addition, abstracts addressing the mechanisms that ultimately control phosphorus burial and preservation in sediments are desired. Included studies will range from detailed examinations of sediment chemistry to model simulations that explore the effect of phosphorus cycle changes on global marine and atmospheric chemistry. This session should be of interest to all scientists interested in understanding the role of sediments in nutrient dynamics in natural systems.


Click here for more details
ASLO Home Page | ASLO Membership | Help | Contact     Top of Page