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Preferred temperature correlates with evaporative water loss in hylid frogs from northern Australia

Tracy, Christopher R. and Christian, Keith A. (2005). Preferred temperature correlates with evaporative water loss in hylid frogs from northern Australia. Physiological and Biochemical Zoology,78(5):839-846.

Document type: Journal Article
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IRMA ID 78672763xPUB29
Title Preferred temperature correlates with evaporative water loss in hylid frogs from northern Australia
Author Tracy, Christopher R.
Christian, Keith A.
Journal Name Physiological and Biochemical Zoology
Publication Date 2005
Volume Number 78
Issue Number 5
ISSN 1537-5293   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-24744441701
Start Page 839
End Page 846
Total Pages 8
Place of Publication Chicago, IL, United States
Publisher The University of Chicago Press
Field of Research 0606 - Physiology
0608 - Zoology
1116 - Medical Physiology
HERDC Category C1 - Journal Article (DEST)
Abstract We measured temperature preferences of 12 species of hylid frogs (Litoria and Cyclorana) from northern Australia in a laboratory thermal gradient. These species represented a range of ecological habitat use (aquatic, terrestrial, arboreal), adult body size (0.5-60 g), and cutaneous resistance to water loss (R-c = 0.6-63.1 s cm(-1)). We found significant differences among species in selected skin temperature and gradient temperature but not in the variances of these measures ( an index of precision of temperature selection). The species' differences correlated significantly with cutaneous resistance to water loss, with more-resistant frogs selecting higher skin and substrate temperatures in the thermal gradient, even after phylogenetic relationships are taken into account. Because cutaneous resistance to water loss also correlates with ecological habit ( arboreal > terrestrial > aquatic), we suggest that their higher resistance to water loss allows arboreal and terrestrial species better ability to tolerate high temperatures, where growth or locomotory speed may be higher, without the associated risk of desiccation.
Keywords iguana conolophus-pallidus
retreat-site selection
tree frogs
thermal physiology
body temperatures
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