EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/20/2019 | 3:15 PM - 3:30 PM | THERMAL NICHE AND TROPHIC REDUNDANCY COMBINE TO DRIVE NEUTRAL EFFECTS OF EXPERIMENTAL WARMING ON ORGANIC MATTER FLUX THROUGH A STREAM FOOD WEB | 250 DE
THERMAL NICHE AND TROPHIC REDUNDANCY COMBINE TO DRIVE NEUTRAL EFFECTS OF EXPERIMENTAL WARMING ON ORGANIC MATTER FLUX THROUGH A STREAM FOOD WEB
Climate warming is predicted to alter flows of energy through food webs due to varied effects of temperature on physiological rates, community structure, and trophic dynamics. Few studies, however, have experimentally assessed the net effect of warming on energy flux and food web dynamics in natural intact communities. Here, we test how warming affects energy flux and the trophic basis of production in a natural invertebrate food web by experimentally heating a stream reach in southwest Iceland by ~4°C for two years and comparing its response to an unheated reference stream. Diatoms dominated the trophic basis of production in both study streams, contributing 80 – 91% to secondary production. Although warming shifted organic matter flows within the food web, total resource consumption did not increase as predicted. The neutral effect of warming on total energy flow through the food web was a result of taxon-level variation in responses to warming, a neutral effect on production, and strong trophic redundancy within the invertebrate assemblage. Thus, food webs characterized by a high degree of trophic redundancy may be more resistant to the effects of climate warming than those with more specialized consumers
- ClimateChange
- Temperature
- Invertebrate
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Presenters/Authors
Daniel Nelson
(), University of Oklahoma, daniel.nelson79@gmail.com;
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Jonathan Benstead
(), University of Alabama, jbenstead@ua.ed;
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Wyatt Cross
(), Montana State University, wyatt.cross@montana.edu ;
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Alexander D. Huryn
(), The University of Alabama, huryn@ua.edu;
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James Hood
(), The Ohio State University, hood.211@osu.edu;
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Philip Johnson
(), University of Alabama, pjohnson@eng.ua.edu;
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James Junker
(), Montana State University, james.junker1@gmail.com;
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Jon Olafsson
(), Iceland Marine and Freshwater Research Institute, jon.s.olafsson@hafogvatn.is;
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