2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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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;