2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/27/2021 | 2:00 PM - 3:30 PM | TROPHIC BASIS OF PRODUCTION FOR FISH IS AUTOCHTHONOUS IN TEMPERATE STEPPE HEADWATERS OF THE USA AND MONGOLIA | Virtual Platform
TROPHIC BASIS OF PRODUCTION FOR FISH IS AUTOCHTHONOUS IN TEMPERATE STEPPE HEADWATERS OF THE USA AND MONGOLIA
Characterizing the trophic bases of production supporting metazoan consumers in freshwater food webs has been a research priority for lotic ecologists for decades. In particular, the relative proportions of autochthonous versus allochthonous resources supporting consumer production may vary either predictably by stream position based on an upstream-downstream gradient (River Continuum Concept), or by hydrogeomorphic patches formed by punctuated, semi-predictable differences in physical channel complexity (Riverine Ecosystem Synthesis). We sampled individuals from the dominant fish species of major feeding groups at 56 headwater stream sites representing different functional process zones distributed across three ecoregions of the United States and Mongolia. We used carbon amino acid isotope analysis to estimate basal resources supporting fish production using an isotopic fingerprinting approach combined with Bayesian mixing models. Results suggest that carbon of terrestrial origin provided negligible support for fish food webs, while sources of autochthonous origin provided dominant support across all stream sites. In this study, we observed strong evidence for autochthonous support of fish food webs as has been observed for streams in other recent studies, but we did not find support for that aspect in predictions of the RCC or RES.
- Geomorphology
- Stream
- Ecosystem functioning
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Presenters/Authors
Emily Arsenault
(), University of Kansas, erarsenault@ku.edu;
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James H. Thorp
(), University of Kansas/Kansas Biological Survey, thorp@ku.edu;
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Michael Polito
(), Louisiana State University, mpolito@lsu.edu;
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