2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/22/2018 | 11:45 AM - 12:00 PM | RECONCILING THE TEMPERATURE DEPENDENCE OF MACROINVERTEBRATE PRODUCTION ACROSS A NATURAL STREAM TEMPERATURE GRADIENT | 410 A
RECONCILING THE TEMPERATURE DEPENDENCE OF MACROINVERTEBRATE PRODUCTION ACROSS A NATURAL STREAM TEMPERATURE GRADIENT
Ongoing climate warming necessitates improved understanding of the role that temperature plays in regulating the biological fluxes of energy and materials that underpin ecosystem processes. These fluxes are well described at subcellular and individual levels by metabolic scaling theory (MST), which predicts that they increase with temperature based on the activation energy (AE) of subcellular reactions (~0.65 eV for heterotrophic respiration). While these patterns have been shown to scale to ecosystems, environmental and life-history factors may complicate their scaling via effects on the subcomponents of these fluxes—standing biomass and growth rate. Here, we present patterns in biomass, growth rate, and production of macroinvertebrate populations and communities in geothermally-heated streams of Iceland spanning a wide temperature gradient. Mean annual body size-corrected community biomass was less sensitive to temperature (AE ~0.43 eV) than predicted by MST, while species growth rates diverged from MST predictions and showed seasonal dependence related to light availability (AE ~0.14 eV vs 0.48eV in high vs low light). Further work will reconcile these patterns, their drivers, and implications for predicting the productivity of macroinvertebrates and the ecosystem functions they support under shifting temperature regimes.
- Climate Change
- Temperature
- Invertebrate
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Presenters/Authors
James Junker
(), Montana State University, james.junker1@gmail.com;
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Wyatt Cross
(), Montana State University, wyatt.cross@montana.edu ;
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Jonathan Benstead
(), University of Alabama, jbenstead@ua.ed;
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James Hood
(), The Ohio State University, hood.211@osu.edu;
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Alexander D. Huryn
(), The University of Alabama, huryn@ua.edu;
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Gisli Mar Gislason
(), University of Iceland, gmg@ghi.is;
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Daniel Nelson
(), University of Oklahoma, dnelson12@crimson.ua.edu;
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Jon S Olafsson
(), Icelandic Marine and Freshwater Research Institute, jon.s.olafsson@gmail.com;
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