2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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6/06/2017 | 2:00 PM - 2:15 PM | PATTERNS OF MACROINVERTEBRATE COMMUNITY COMPOSITION AND PRODUCTION ACROSS A NATURAL STREAM TEMPERATURE GRADIENT | 306C

PATTERNS OF MACROINVERTEBRATE COMMUNITY COMPOSITION AND PRODUCTION ACROSS A NATURAL STREAM TEMPERATURE GRADIENT

As global temperatures increase, it is critical that we understand (a) how warming may alter structure of ecological communities and (b) how such changes may impact ecosystem functions such as the flux of energy through food webs. Predicting these responses is challenging because of difficulties in isolating temperature from other environmental variables and in scaling short-term and species-level responses to longer timescales and higher levels of organization. Here, we exploit a natural temperature gradient (5-30°C) within a small geographical area to quantify the influence of temperature on invertebrate assemblage structure and production in six Icelandic streams. We show that temperature acts as a strong filter on community structure as well as on the phenology and evenness of invertebrate production. Dominant energy fluxes shifted from chironomid taxa in cold streams to gastropods and simuliids in warmer ecosystems. Community-level production exhibited strong seasonality in response to light, even in streams that maintain similar temperatures year-round. Our results provide a unique assessment of the relationship between temperature and community secondary production and the potential response of stream ecosystem function to climate warming.

C32 Primary and Secondary Production
C25 Food Webs
C20 Climate Change

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Presenters/Authors

James Junker (), Montana State University, james.junker1@gmail.com;