2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

6/06/2017 | 3:00 PM - 3:15 PM | WABASH RIVER FOOD WEB BEFORE AND AFTER AN ECOSYSTEM TRANSITION | 302B

WABASH RIVER FOOD WEB BEFORE AND AFTER AN ECOSYSTEM TRANSITION

Fish assemblages in the Wabash River, Indiana underwent a major transition in the mid-1990s. Planktivore- omnivores (Gizzard Shad) were dominant before 1990 and their abundances decreased to nearly absent in the mid-1990s. Benthic invertivores (suckers, Freshwater Drum) were in low abundance before 1990 and increased to current high abundances. We found that nutrients applied to agricultural fields in the watershed covaried with the fish trophic group abundances: phosphorus decreased and nitrogen increased during the same period. Our current hypothesis is that nutrient loads modified phytoplankton productivity at the base of food webs and magnified up food webs to effects on all trophic levels. We quantified carbon sources in historic and recent fish tissues using compound specific amino acid analysis to determine if carbon sources were modified during the past 50 years.

C11 Community Ecology
C25 Food Webs
S29 Macrosystem Ecology of Aquatic Systems

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Presenters/Authors

Mark Pyron (), Ball State University, mpyron@bsu.edu;