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Effects of temperature and aquatic PO2 on the physiology and behaviour of Apalone ferox and Chrysemys picta

S. L. Prassack, B. Bagatto* and R. P. Henry

Department of Biological Sciences, Auburn University, Auburn, AL 36849, USA



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  		Fig. 1. V·O2 (mlkg-1h-1) at two temperatures for Chrysemys picta and Apalone ferox. Values represent means + S.E.M. For C. picta, N=11 at 25°C and all PO2 values, N=4 at 15°C at normoxia, and N=5 at 15°C for hypoxia and hyperoxia. For A. ferox, N=9 at 25°C for normoxia and hypoxia and N=6 for hyperoxia; at 15°C, N=6 for normoxia and hypoxia, and N=5 for hyperoxia. Vertical columns represent mass-specific total V.O2. The shaded area represents the non-pulmonary contribution and the unshaded area represents the pulmonary contribution. See text for statistical analysis.

 


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  		Fig. 2. PCO2/PO2 diagram. Diagram of gas exchange by diffusion in gas and water phases (modified from Dejours, 1981). For a given value of respiratory quotient (RQ), the relationship between (PextO2-PintO2, where PextO2 is water PO2 and PintO2 is blood PO2) and PintCO2 is a straight line originating at the abscissa PextO2. Increases in RQ (non-pulmonary) and decreases in RQ (pulmonary) shift PCO2 values of bimodal breathers to various levels between those for strict water- and air-breathers. A25, A15, A. ferox at 25 and 15°C; C25, C15, C. picta at 25 and 15°C. 1mmHg=0.133kPa.

 

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© The Company of Biologists Ltd 2001