Abstract
Adult male chorus frogs (Pseudacris triseriata) were collected from 14 breeding congregations situated along an altitudinal gradient running from approximately 1,500 m in the piedmont of northcentral Colorado to approximately 3,000 m in the Front Range of the Rocky Mountains. Critical thermal maxima (CTMs), determined following acclimation of frogs at constant temperatures of 5⚬ C and 20⚬ C, were found to decline clinally with increasing elevation of the collecting sites. Since the decline in heat resistance with increasing elevation corresponds with a similar elevational gradient in ambient temperature, it appears that interpopulation variation in CTMs reflects physiological adaptation of chorus frogs to the different temperature conditions encountered at different localities.
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