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The Ecological Significance of Water Flux Rates in Arboreal Desert Lizards of the Genus Urosaurus

Justin D. Congdon, Laurie J. Vitt, Richard C. van Loben Sels and Robert D. Ohmart
Physiological Zoology
Vol. 55, No. 3 (Jul., 1982), pp. 317-322
Stable URL: http://www.jstor.org/stable/30157895
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Ecological Significance of Water Flux Rates in Arboreal Desert Lizards of the Genus Urosaurus
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Abstract

Water flux rates and feeding rates of Urosaurus graciosus and Urosaurus ornatus were studied during June and July in Arizona. The mean water flux rate of U. graciosus (36.6 ml H₂O kg⁻ⁱ day⁻ⁱ) was significantly higher than that of U. ornatus (25.8 ml H₂O kg⁻ⁱ day⁻ⁱ). Urosaurus graciosus is less able to escape high afternoon temperatures than U. ornatus, which frequently seeks refuge under bark and in crevices of trees. The habitat occupied by U. graciosus also is subject to higher temperatures than that occupied by U. ornatus. The higher water flux rate of U. graciosus is associated with differences in behavior, habitat, and greater food intake.

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