2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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6/08/2017  |   2:00 PM - 2:15 PM   |  REVISITING LINDEMAN'S WORK ON CEDAR BOG LAKE USING STABLE ISOTOPES TO STUDY FOOD WEB DYNAMICS   |  306B

REVISITING LINDEMAN'S WORK ON CEDAR BOG LAKE USING STABLE ISOTOPES TO STUDY FOOD WEB DYNAMICS

Since Raymond Lindeman’s pioneering work at Cedar Bog Lake, new techniques for the study of energy flow in aquatic ecosystems have been developed, yet none of these have been applied to this historically and scientifically significant lake. We conducted six sampling events, collecting terrestrial organic matter, within-lake primary producers, zooplankton, aquatic invertebrates, and fish, from spring to fall in the small mesotrophic lake. We utilized bulk stable isotope analyses (D, 13C, 15N) and the Bayesian mixing model framework, MixSIAR, to quantify allochthonous vs. autochthonous nutrient inputs, trace energy sources, determine the trophic position of each species and the overall food chain length, and identify seasonal variations in diet. Preliminary analyses indicate allochthonous inputs are a substantial food resource for some primary consumers, exceeding contributions of attached and planktonic algae and macrophytes by more than half. Our study provides quantification of specific food web pathways described in Lindeman’s seminal research, and preliminary analyses suggest terrestrial subsidies play a more significant role as a basal food resource than Lindeman recognized in his classic diagram.

• C07 Lentic Ecology
• C11 Community Ecology
• C25 Food Webs

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Presenters/Authors

Alexi Besser (), University of New Mexico , acbesser@unm.edu;

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Christy Dolph (), Department of Ecology, Evolution and Behavior, University of Minnesota, dolph008@umn.edu;

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Jacques Finlay (), University of Minnesota, jfinlay@umn.edu;

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