Abstract
1. 1. Oxygen consumption ( V̇O 2) in the iguanid lizard Sceloporus occidentalis was automatically recorded every hour, at 25°C and in continuous light (LL) for at least 3 consecutive days. Data were recorded with 36 lizards from 150, 1500 and 2200 m in the central Sierra Nevada of California. 2. 2. All lizards displayed a conspicuous circadian rhythm in V̇O 2, the high level being usually more than 3 times the low level. 3. 3. The volume of O 2 consumed during a nychthemeron is significantly higher in males from 1500 and 2200 m than in females from the same elevations. No difference between sexes was found in lizards from 150 m. 4. 4. The volume of O 2 consumed during a nychthemeron is significantly higher in males at 1500 and 2200 m than in either sex at 150 m. 5. 5. There is no significant difference with either sex or elevation in the daily minimum V̇O 2. 6. 6. The difference in the daily total O 2 consumption is due to an increased activity (both intensity and duration) in males at higher elevations.
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