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Tuesday, February 7 • 2:00pm - 2:20pm
Technical Session. Historic Food Webs Discern Ecosystem Changes in a Large River

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AUTHORS: Mark Pyron, Robert Shields, Mario Minder, Jesse Becker - Ball State University

ABSTRACT: Food webs can be studied by analyzing tissue of organisms for C and N isotope ratios. We studied food webs in the Wabash River, Indiana in an attempt to identify correlates of a shift in fish assemblages that occurred in the 1990s. We compared recent food webs to historical food webs by using our fish collections or museum specimens as tissue sources. Our first approach was a bulk tissue analysis of carbon and nitrogen isotope ratios. This allowed us to examine trophic levels and potential carbon sources. Our more recent approach is compound specific amino acid isotope analysis, which allows to identify primary producers as sources for all consumers.

Tuesday February 7, 2017 2:00pm - 2:20pm CST
Grand Ballroom C