Summary
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1.
Measurements of oxygen consumption and lactate production during activity were made in three species of amphibians. Oxygen debts and rates of lactate removal were also studied.
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2.
Maximal values of oxygen consumption are 200 and 500% above resting levels in the plethodontid salamanderBatrachoseps attenuatus and the frogHyla regilla, respectively (Kg. 1). However, these values are not attained until 5–15 min after the cessation of activity.
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3.
Batrachoseps, a lungless animal, derives 25 times more energy during 2 min of activity from lactate production than from oxygen consumption.Hyla is also predominantly anaerobic during activity butBufo boreas is mainly aerobic.
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4.
An inverse relationship exists between aerobic and anaerobic scopes in amphibians, such that total energetic output during activity is similar even though the component factors may differ by ten-fold.
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5.
Oxygen debts inHyla andBatrachoseps after 2-min activity are repayed in approximately one hour but rates of lactate removal are much lower (Fig. 2); large amounts of lactate persist long after oxygen consumption has returned to resting levels. Oxygen debt, therefore, cannot be used as an estimate of energetic expenditure during activity.
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Support for these studies was provided by a Miller Postdoctoral Fellowship to AFB and NSF Grant GB-35241X to PL. The technical assistance of John Ruben is gratefully acknowledged.
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Bennett, A.F., Licht, P. Relative contributions of anaerobic and aerobic energy production during activity in amphibia. J. Comp. Physiol. 87, 351–360 (1973). https://doi.org/10.1007/BF00695269
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DOI: https://doi.org/10.1007/BF00695269