AI Article Synopsis
- Amphibian movement is influenced by both temperature and hydration, but organisms face multiple environmental factors simultaneously in nature.
- To study these effects, researchers examined two populations of a small amphibian from environments with very different temperatures and rainfall.
- Findings revealed that locomotor performance improved with higher temperatures and better hydration, plateauing at 25-30°C, and that the warmer environment population showed less impact on movement from dehydration, suggesting a possible adaptation to heat.
Article Abstract
Amphibian locomotor capacity is strongly linked to temperature and hydration. However, organisms in nature experience covariation of multiple environmental factors, and thus to better understand the effects of thermal and hydric conditions on physiological performance, it is critical not only to experimentally disentangle them but also to incorporate potential interactive effects due to geographic variation. To this end, we selected two populations of the small amphibian inhabiting highly contrasting temperatures and precipitation regimens. With these two populations, we evaluated the thermal and hydric sensitivities of locomotor performance. For both factors, performance increased with temperature as well as with hydration level, although performance reached a plateau between 25° and 30°C. In addition, the influence of dehydration on performance was independent of the temperature at which it was tested. Our results also showed that the population from the warmer environment has lower sensitivity of locomotor performance to dehydration, probably as a consequence of thermal adaptation, although further studies might be required to fully understand this.
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| http://dx.doi.org/10.1086/710537 | DOI Listing |
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