2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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6/08/2017 | 9:45 AM - 10:00 AM | EXPERIMENTAL WHOLE-ECOSYSTEM WARMING ALTERS ENERGY PATHWAYS BUT NOT TOTAL ENERGY FLOW IN A STREAM FOOD WEB | 306B

EXPERIMENTAL WHOLE-ECOSYSTEM WARMING ALTERS ENERGY PATHWAYS BUT NOT TOTAL ENERGY FLOW IN A STREAM FOOD WEB

Climate warming will alter flows of energy through food webs due to the critical influence of temperature on physiological rates, community structure, and trophic dynamics. However, few studies have experimentally assessed the influence of warming on energy flux and food web dynamics in intact communities. Here we test how warming affects energy flux and the trophic basis of production in a natural food web by experimentally heating a stream reach by ~4°C for two years. Experimental warming led to increases in estimated metabolic demand by the invertebrate community, but no change in measured production. Consequently, estimated total resource consumption based on production did not increase. Regardless of discrepancies between estimated demand and consumption, warming shifted organic matter flows within the food web (e.g., consumption of amorphous detritus decreased, while that of filamentous algae increased). Elevated metabolic demand without increases in total resource consumption was likely driven by increases in resource quality, taxon-level variation in responses to warming, or differences in the temperature dependences of metabolism and ingestion that are not accounted for by production-based analyses. Overall, our results underscore the challenges of predicting temperature effects on complex food web processes.

C03 Invertebrates
C03 Invertebrates
C25 Food Webs

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Presenters/Authors

Daniel Nelson (), University of Oklahoma, dnelson12@crimson.ua.edu;