Journal
JOURNAL OF THERMAL BIOLOGY
Volume 37, Issue 8, Pages 631-639Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jtherbio.2012.07.004
Keywords
Thermoregulation; Null model; Drosophila; Thermal preference; Ectotherm; Reaction norm
Funding
- Division Of Integrative Organismal Systems
- Direct For Biological Sciences [1038016] Funding Source: National Science Foundation
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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. (C) 2012 Elsevier Ltd. All rights reserved.
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