Abstract
1. 1. Red blood cell counts and hemoglobin content were determined for blood samples from Sceloporus jarrovi collected at altitudes of 5100, 6000 and 8600 ft. 2. 2. Oxygen capacity was determined for blood samples from Sceloporus occidentalis collected at altitudes of 500, 4000, 6000 and 7000 ft. 3. 3. Oxygen-binding parameters of blood from both species showed significant differences for populations from 6000 ft and above as compared with lower altitude populations. These differences are attributed to the more restricted annual heat budget of the higher altitude lizards.
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