Voluntary body temperature selection of unrestrained Lacerta viridis revealed consistant photoperiod entrained diel patterns. Each daily cycle was characterized by an elevation in body temperature (T ) to a high level plateau which declined at the onset of scotophase to a low level; both of which were maintained within narrow ranges.Under natural photoperiod in fall, lizards responded to shorter days by sinking low level T 's and expanding the duration of these low levels until no rhythmicity was shown. Subsequent exposure to long day, LD 16:8, induced self-arousal and a slightly altered diel T selection with significantly higher T 's being chosen at both the elevated and lower daily levels. Changes in the relations of diel T selection due to shift in photoperiod, suggest that photoperiod acts as a seasonal indicator for thermal adaptation.
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