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Journal of Experimental Biology 114,37-51 (1985)
Published by Company of Biologists 1985

Effects of Body Temperature on Respiration, Blood Gases and Acid-Base Status in the Turtle Chrysemys Picta Bellii

M. L. Glass 1, R. G. Boutilier 2, and N. Heisler 2

1 Abteilung Physiologie, Max-Planck-Institut für experimentelle Medizin, Göttingen, F.R.G.: Department of Zoophysiology, University of Aarhus, Aarhus, Denmark.
2 Abteilung Physiologie, Max-Planck-Institut für experimentelle Medizin, Göttingen, F.R.G.

Freshwater turtles (Chrysemys picta bellii Gray) were acclimated to temperatures of 5, 10, 20 and 30°C for at least 12 days, and pulmonary ventilation, oxygen uptake and arterial pH, PCOCO2 and POO2 were determined in completely unrestrained specimens. Oxygen uptake (V·OO2) increased overproportionately (6.7-fold) as compared to pulmonary ventilation (V·1, 4.4-fold) when the temperature increased from 10 to 30°C. The observed rise in arterial PCOCO2 from 13 (5°C) to 32mmHg (30°C) was the result of a decrease in V·1/V·OO2, whereas an increase of arterial POO2 from 12Torr at 5°C to about 60Torr at 20 and 30°C mainly resulted from the effects of intracardiac blood shunting combined with temperature-dependent shifts of the oxygen dissociation curve. Arterial pH fell with rising temperature significantly less ({Delta}pH/{Delta}t =-0.010U/°C) than required for constant relative alkalinity and for constant dissociation of imidazole. The changes of cerebrospinal fluid pH with temperature, calculated from the mean arterial PCOCO2 values, were even smaller [{Delta}pH/{Delta}tCSF = -0.008). It is concluded that the observed temperature dependence of the acid-base status is not in agreement with the alphastat hypothesis.

Key words: Acid-base status, alphastat, blood gases, reptilia, respiration, temperature, turtles.

Accepted on October 17, 1983




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© The Company of Biologists Ltd 1985