2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/22/2018 | 11:00 AM - 11:15 AM | ECOLOGICAL AND EVOLUTIONARY RESPONSES OF ZOOPLANKTON TO EXTREME EUTROPHICATION | 321
ECOLOGICAL AND EVOLUTIONARY RESPONSES OF ZOOPLANKTON TO EXTREME EUTROPHICATION
Extreme eutrophication of waterbodies has challenged our theoretical understanding of how ecosystems function. We studied zooplankton over a gradient of eutrophication in Iowa lakes to examine how and why stoichiometric theory fails to predict dynamics in these systems. Using data from 130 lakes across Iowa from 2009-2015, we found that zooplankton communities were functionally different between N- and P-limited lakes. Consistent with stoichiometric nutrient recycling theory, N-rich taxa dominated in N-limited lake-years. Surprisingly, however, P-rich Daphnia did not vary in biomass between N- and P-limited lake-years. We thus examined intraspecific variation in Daphnia among a subset of these lakes to test whether intraspecific responses reduce the functional impacts of zooplankton in hypereutrophic systems. Daphnia growth is thought to peak under a narrow range of total phosphorus (TP) concentrations (i.e., the knife-edge hypothesis), but the predictions of this hypothesis were not supported in Iowa lakes. Instead, we found that genetic differences in growth and fecundity reaction norms between Daphnia clones from mesotrophic and hypereutrophic lakes support the lack of a stoichiometric knife-edge. We suggest that both ecological and evolutionary responses are important components of how ecosystems respond to eutrophication.
- Evo-eco Dynamics
- Stoichiometry
- Zooplankton
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Presenters/Authors
Eric Moody
(), Iowa State University, erickmoody@gmail.com;
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Grace Wilkinson
(), University of Wisconsin-Madison, wilkinso@iastate.edu;
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