Abstract
1. 1. When turtles are heated in water, either radiantly or with an immersion heater, there is little control of head temperature; head-body temperature differences are of considerable magnitude, and represent a lag effect. 2. 2. By contrast, when heated radiantly in the absence of water, there is considerable physiological control of head temperature. 3. 3. At thermal endpoints frequently used in tolerance studies, head-body temperature differences are large and should be taken into account in the future. 4. 4. The existence of internal temperature gradients in turtles frequently makes use of cloacal temperature as representative of “body temperature” of limited value. 5. 5. In turtles, maintaining rate of heating constant in different sized animals has drawbacks in some types of studies; it is suggested that in some investigations all sized animals be heated under identical conditions, rather than at equal heating rates.
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