2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/20/2019 | 9:00 AM - 9:15 AM | DEVELOPMENT AND APPLICATION OF THE “TROPHIC BASIS OF PRODUCTION” METHODOLOGY IN QUANTIFYING FOOD WEBS | 250 DE
DEVELOPMENT AND APPLICATION OF THE “TROPHIC BASIS OF PRODUCTION” METHODOLOGY IN QUANTIFYING FOOD WEBS
Attempts to describe food webs go back >100 years, but the vast majority have been qualitative (who eats whom). In contrast, “energy flow” studies (starting with Lindeman, Odums) were quantitative, but initially limited to flows between “trophic levels” rather than between taxa or functional groups. More detailed energy flow studies followed, especially during the years of the International Biological Program, often focusing on major taxa or function groups. A taxon-based approach using secondary production and quantitative gut analyses was developed in 1980 to estimate the “trophic basis of production” (TBP); i.e., how much individual foods contribute to production of individual taxa. This approach eventually led to estimating complex taxon-specific flow webs, as have now been demonstrated for entire communities (mostly freshwater) by many participants in this session. Unlike early energy flow studies, estimation of bottom-up flows with the TBP approach makes it possible to estimate top-down predator impacts and trophic position of all taxa within a community. I describe the history of how the approach was developed, how it compares with other attempts to quantify food webs, and why to date it has been limited to freshwater communities.
- Food Webs
- Invertebrate
- Population
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Presenters/Authors
Arthur Benke
(), University of Alabama, abenke@ua.edu;
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