Abstract
Turtles maintained on photoperiods of 8 and 16 hr (LD 8:16, LD 16: 8) in which the light period is centered at noon EST and at constant temperatures of 100 and 20? C are more sensitive to temperature at certain hours. Animals acclimated to LD 16:8 at 20? C and LD 8:16 at 100 C had highest tolerances at 1400 hr; those acclimated to LD 16:8 at 100 C showed a phase-shift of -8 hr and those acclimated to LD 8:16 at 200 C a phase-shift of +4 hr with respect to the other acclimations.
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