2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/20/2019 | 11:15 AM - 11:30 AM | USE OF TROPHIC BASIS OF PRODUCTION ANALYSES AND STABLE ISOTOPE TRACER ADDITIONS TO QUANTIFY ENERGY FLOW AND NUTRIENT CYCLING IN TROPICAL STREAM FOOD WEBS | 250 DE
USE OF TROPHIC BASIS OF PRODUCTION ANALYSES AND STABLE ISOTOPE TRACER ADDITIONS TO QUANTIFY ENERGY FLOW AND NUTRIENT CYCLING IN TROPICAL STREAM FOOD WEBS
We quantified energy flow and nutrient cycling in Central American headwater mountain streams over multiple years in order to assess how disease-driven amphibian declines were influencing ecosystem function. These declines resulted in sudden, catastrophic losses of consumer biomass and diversity from the streams. Initial studies suggested detrital pathways dominated energy flow and nutrient cycling in these forested systems, particularly when standard functional group and trophic basis of production approaches were employed. However, autochthonous pathways were significant, particularly in healthy streams with grazing tadpoles. Tracer studies with 15N additions indicated that although coarse detritus accounted for ~83% of N uptake, the grazing pathway accounted for ~87% of N flux from resources in to animals when amphibians were present; N fluxes from detritus to shredders and periphyton to grazers became similar after amphibian declines. Gut content analyses revealed high degrees of omnivory across taxa and functional groups in the streams, reflecting significant complexity in food webs. Gut content analyses also further demonstrated the importance of autochthonous pathways. Collectively, these studies illustrate the importance of using multiple approaches and examining different scales to evaluate energy flow and nutrient cycling patterns in freshwater habitats.
- Tropics
- Amphibian
- Biogeochemistry
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Presenters/Authors
Matt Whiles
(), University of Florida, mwhiles@ufl.edu;
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Checo Colon-Gaud
(), Georgia Southern University, jccolongaud@georgiasouthern.edu;
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Therese Frauendorf
(), University of Victoria, tfrauendorf@gmail.com;
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Amanda Rugenski
(), University of Georgia, atrugenski@gmail.com;
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Robert O. Hall
(), Flathead Lake Biological Station, University of Montana, bob.hall@flbs.umt.edu;
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Walter Dodds
(), Kansas State University, wkdodds@ksu.edu;
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Alexander D Huryn
(), The University of Alabama, huryn@bama.ua.edu;
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