The complex drivers of thermal acclimation and breadth in ectotherms |
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| Authors: | Jason R. Rohr David J. Civitello Jeremy M. Cohen Elizabeth A. Roznik Barry Sinervo Anthony I. Dell |
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| Affiliation: | 1. Department of Integrative Biology, University of South Florida, Tampa, FL, USA;2. Department of Biology, Emory University, Atlanta, GA, USA;3. Department of Research and Conservation, Memphis Zoo, Memphis, TN, USA;4. Department of Ecology and Evolutionary Biology, University of California at Santa Cruz, Santa Cruz, CA, USA;5. National Great Rivers Research and Education Centre (NGRREC), Alton, IL, USA;6. Department of Biology, Washington University in St. Louis, St. Louis, MO, USA |
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| Abstract: | Thermal acclimation capacity, the degree to which organisms can alter their optimal performance temperature and critical thermal limits with changing temperatures, reflects their ability to respond to temperature variability and thus might be important for coping with global climate change. Here, we combine simulation modelling with analysis of published data on thermal acclimation and breadth (range of temperatures over which organisms perform well) to develop a framework for predicting thermal plasticity across taxa, latitudes, body sizes, traits, habitats and methodological factors. Our synthesis includes > 2000 measures of acclimation capacities from > 500 species of ectotherms spanning fungi, invertebrates, and vertebrates from freshwater, marine and terrestrial habitats. We find that body size, latitude, and methodological factors often interact to shape acclimation responses and that acclimation rate scales negatively with body size, contributing to a general negative association between body size and thermal breadth across species. Additionally, we reveal that acclimation capacity increases with body size, increases with latitude (to mid‐latitudinal zones) and seasonality for smaller but not larger organisms, decreases with thermal safety margin (upper lethal temperature minus maximum environmental temperatures), and is regularly underestimated because of experimental artefacts. We then demonstrate that our framework can predict the contribution of acclimation plasticity to the IUCN threat status of amphibians globally, suggesting that phenotypic plasticity is already buffering some species from climate change. |
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| Keywords: | Acclimation critical thermal limits global climate change phenotypic plasticity thermal biology thermal performance curves |
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