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The effect of photoperiod acclimation on the thermoregulation of the lizard,Sceloporus undulatus

✍ Scribed by Ballinger, Royce E. ;Hawker, Jon ;Sexton, Owen J.

Publisher: John Wiley and Sons
Year: 1969
Tongue: English
Weight: 385 KB
Volume: 171
Category: Article
ISSN: 0022-104X
DOI: 10.1002/jez.1401710107

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✦ Synopsis

Preferred temperatures of Sceloporus unduhtus, which were acclimated to 2OoC under 12 hour and 6 hour photoperiods, were determined in a thigmothermal gradient. The longer photoperiod (12 hours light) increased the preferred temperature in lizards collected i n May while the shorter photoperiod (6 hours light) decreased the preferred temperature in lizards collected in July. Response in the preferred temperature to photoperiod is suggested to be a physiological adaptation which facilitates the use of the mechanism of acclimation of the thermal tolerance to seasonal changes in environmental temperatures. Photoperiod differences did not alter the criitcal maximum or lethal maximum temperatures.

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