Abstract
1. 1. The aerobic metabolic scope for activity is 1·75 times greater in the active, aquatic, red-eared turtle, Pseudemys scripta, than in the more sluggish, terrestrial, ornate box turtle, Terrapene ornata, at their common preferred body temperature of 30°C. 2. 2. Oxygen consumption increases eight- to thirtyfold during activity. 3. 3. Both heart rate and oxygen pulse rise with an increase in body temperature and with exercise. 4. 4. At 30°C glycolysis supplies 60–75 per cent of the energy available during a burst of activity. 5. 5. At 30°C total metabolic scope for activity is 1·14 times greater in P. scripta than in T. ornata.
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