Disentangling thermal preference and the thermal dependence of movement in ectotherms |
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Authors: | Michael E. Dillon Rongsong Liu George Wang Raymond B. Huey |
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Affiliation: | 1. Department of Zoology and Physiology, University of Wyoming, Laramie, WY 82071, USA;2. Program in Ecology, University of Wyoming, Laramie, WY 82071, USA;3. Department of Mathematics, University of Wyoming, Laramie, WY 82071, USA;4. Max Planck Institute for Developmental Biology, Tübingen 72076, Germany;5. Department of Biology, University of Washington, Seattle, WA 98195, USA |
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Abstract: | Many ectotherms thermoregulate by choosing environmental temperatures that maximize diverse performance traits, including fitness. For this reason, physiological ecologists have measured preferred temperatures of diverse ectotherms for nearly a century. Thermal preference is usually measured by observing organism distributions on laboratory thermal gradients. This approach is appropriate for large ectotherms which have sufficient thermal inertia to decouple body temperatures from gradient temperatures. However, body temperatures and therefore speeds of movement of small ectotherms will closely track gradient temperature, making it difficult to distinguish between thermal preference and thermal dependence of movement. Here we develop and demonstrate the use of a patch model to derive the expected thermal gradient distribution given only the thermal dependence of movement. Comparison of this null distribution with the observed gradient distribution reveals thermal preference of small ectotherms. |
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Keywords: | Thermoregulation Null model Drosophila Thermal preference Ectotherm Reaction norm |
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