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First published online March 2, 2006
Journal of Experimental Biology 209, 1052-1057 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02121
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Metabolic and blood gas dependence on digestive state in the Savannah monitor lizard Varanus exanthematicus: an assessment of the alkaline tide

L. K. Hartzler*, S. L. Munns{dagger}, A. F. Bennett and J. W. Hicks

Department of Ecology and Evolutionary Biology, University of California, Irvine, CA, 92697-2525, USA


Figure 1
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  		Fig. 1. Time course of postprandial (A) oxygen consumption (VO2), (B) carbon dioxide secretion (VCO2), and (C) respiratory exchange ratio in Varanus exanthematicus with time 0 representing the fasted state and all other values postprandial. Values are means ± 1 s.e.m. (N=5); asterisks mark mean values that are significantly different (P<0.05) from the fasting value. The dotted lines represent the standard error around the fasting values for comparison throughout the digestive period.

 

Figure 2
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  		Fig. 2. Time course of postprandial change in (A) pHa, (B) [HCO3–], (C) PaCO2 and (D) PaO2 in Varanus exanthematicus with time 0 representing the fasted state and all other values postprandial. Values are mean ± 1 s.e.m. (N=6); asterisks mark mean values that are significantly different (P<0.05) from the fasting value. The dotted lines represent the standard error around the fasting values for comparison throughout the digestive period.

 

Figure 3
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  		Fig. 3. Time course of postprandial change in the concentration of (A) lactate, (B) chloride, (C) sodium and (D) potassium in Varanus exanthematicus with time 0 representing the fasted state and all other values postprandial. Values are mean ± 1 s.e.m. (N=6); asterisks mark mean values that are significantly different (P<0.05) from the fasting value. The dotted lines represent the standard error around the fasting values for comparison throughout the digestive period.

 

Figure 4
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  		Fig. 4. Davenport diagram showing acid–base disturbance caused by feeding. Curved lines are PCO2 isopleths. An initial alkalosis is followed by a relative hypoventilation (increased PaCO2), then a return of pH to fasting levels, and, finally, a return of PaCO2 to fasting levels.

 




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