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First published online March 31, 2007
Journal of Experimental Biology 210, 1472-1480 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.003061
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The urinary bladder as a physiological reservoir that moderates dehydration in a large desert lizard, the Gila monster Heloderma suspectum

Jon R. Davis* and Dale F. DeNardo

School of Life Sciences, Arizona State University, Tempe, AZ 85287-4601, USA


Figure 1
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  		Fig. 1. Mean increase in plasma radioactivity following infusion of 17 000 c.p.m. [3H]2O transurethrally into the urinary bladder of H. suspectum at time 0. Values shown are means ± 1 s.e.m. of seven lizards. Different letters denote statistically significant differences between time points.

 

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  		Fig. 2. Relative rehydration rate of dehydrated H. suspectum following introduction of 30 ml water orally (ORAL) or into the bladder (BLDR). Absolute changes in plasma osmolality is plotted to clarify relative ORAL to BLDR rehydration rates because initial osmolality differed slightly between groups. Values shown are means ± 1 s.e.m. of six lizards per treatment. Different letters denote significantly different values over time and between groups.

 

Figure 3
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  		Fig. 3. Comparison of the daily rate of plasma osmolality increase during food and water deprivation of H. suspectum under three conditions: (1) full urinary bladder initially (FULL initial; filled bar), (2) following complete depletion of the same lizards' full urinary bladder (FULL empty; hatched bar), and empty urinary bladder initially (EMT; open bar). Values shown are means ± 1 s.e.m. of six lizards per group. *Significant differences in daily rate between conditions.

 




© The Company of Biologists Ltd 2007