EFFECT OF TEMPERATURE AND PHOTOPERIOD ON GAS EXCHANGE IN LEOPARD FROG RANA PIPIENS

1. 1. Determinations of pulmonary and cutaneous gas exchange (V̇O2 and V̇O2) were made on frogs acclimatized to temperatures of 5°, 15° and 25°C at 8-hr and 16-hr photoperiods. 2. 2. Lungs supplied 48 per cent of the total oxygen consumed at 5°C and 66 per cent at 25°C. Approximately 75 per cent of the CO2 was released through the skin at 5° and 15°C, and 56 per cent at 25°C. 3. 3. Oxygen uptake was recorded over periods of 24-48 consecutive hours. Under some of the acclimation conditions a daily rhythym in metabolism was observed. © 1968.