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Time constants of heating and cooling in the eastern water dragon, Physignathus lesueruii and some generalizations about heating and cooling in reptiles



Time constants of heating and cooling in the eastern water dragon, Physignathus lesueruii and some generalizations about heating and cooling in reptiles



Journal of Thermal Biology, 41: 95-103



In keeping with other reptiles, core temperature of the lizard P. lesueurii responds more rapidly to a step function increase in temperature than to a corresponding decrease. Observations on 12 spp. (5 families) of non-Chelonian reptiles Varanus gouldi, V. varius, V. punctatus, V. acantharus, Tiliqua scincoides, Amphibolurus barbatus, Dipsosaurus dorsalis, Amblyrhynchus cristatus, Crocodylus porosus, C. johnstoni, Alligator mississippiensis and P. lesueurii heating and cooling in air and water show that strongly predictable relationships exist between thermal time constants and body size. Chelonia Chrysemys picta, Pseudemys floridana, P. scripta, Geochelone carbonaria and Chelydra serpentina show a different pattern. These observations are compared with the predictions of a simple model which, although not sufficiently complex to simulate physiological changes, provides insight into the relative importance of the physical and biological factors which underlie the observed relationships.

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Accession: 022014238

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DOI: 10.1016/0306-4565(79)90052-4


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