Photoperiodic and thermoperiodic interaction affecting fat stores and reproductive indexes in the male green anole, Anolis carolinensis

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Abstract
Daily fluctuations in warm (30°C) and cold (20°C) temperatures have different effects on fat stores and gonad weights of male Anolis carolinensis than constant warm or cold temperatures; and the effects vary depending on the phase relations of the daily thermoperiod with a daily photoperiod. In addition there is a seasonal change in the thermoperiod‐photoperiod interaction. For example an 8‐hour interval of warm temperature beginning eight hours after the onset of a 6‐hour daily photoperiod during July is more stimulatory for testicular weights than similar intervals of warm temperature beginning at 0 or 16 hours after the onset of light, but it is less stimulatory in October. The results suggest that the interaction of thermoperiodic and photoperiodic cycles may have important roles in regulating the annual cycles of reproduction and lipid metabolism.

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