Abstract
1. 1. Heating and cooling rates of a semiaquatic skink ( Sphenomorphus quoyii) and a related terrestrial one ( Ctenotus robustus) were measured in air and during diving. 2. 2. In air, all lizards cooled faster than they heated; all cooled faster in water than in air. 3. 3. Dead water skinks in air heated as rapidly as they cooled; in water dead lizards cooled at similar rates to live ones during diving. 4. 4. In air, adult S. quoyii had higher τ values when heating and cooling than did Ctenotus despite the greater surface area to volume ratio of the former. 5. 5. Juvenile S. quoyii had smaller t values than either of the other two groups. 6. 6. During diving, τ values were similar for all these groups. 7. 7. It would seem that physiological thermoregulation is ineffective in altering heat exchange in these small lizards when submerged. 8. 8. In air, cooling occurs more rapidly than predicted from body size and may be influenced physiologically.
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