Summary
The relations of standard and active aerobic and anaerobic metabolism and heart rate to body temperature (T b) were measured in montane groups of Bufo b. boreas and Rana pipiens maintained under field conditions. These amphibians experience daily variation of T b over 30°C and 23°C, respectively (Carey, 1978). Standard and active aerobic and anaerobic metabolism, heart rate, aerobic and anaerobic scope are markedly temperature-dependent with no broad plateaus of thermal independence. Heart rate increments provide little augmentation of oxygen transport during activity; increased extraction of oxygen from the blood probably contributes importantly to oxygen supply during activity. Development of extensive aerobic capacities in Bufo may be related to aggressive behavior of males during breeding. Standard metabolic rates of both species are more thermally dependent than comparable values for lowland relatives. Thermal sensitivity of physiological functions may have distinct advantages over thermally compensated rates in the short growing season and daily thermal fluctuations of the montane environment.
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Carey, C. Aerobic and anaerobic energy expenditure during rest and activity in montane Bufo b. boreas and Rana pipiens . Oecologia 39, 213–228 (1979). https://doi.org/10.1007/BF00348070
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DOI: https://doi.org/10.1007/BF00348070