Entrainment of the “circadian clock”; in Buthotus minax (Scorpiones: Buthidae)

Abstract
Maximum locomotory activity in B. minax takes place in darkness when the temperature is rising. These factors entrain the circadian rhythm of the species. A bimodal rhythm, with peaks induced by alternating light and darkness and an increase in temperature during the light period, tends to persist in constant temperature and darkness until a single peak of activity every 24 hrs eventually asserts itself. The rhythm is neither accelerated nor retarded in constant darkness and therefore does not follow the circadian rule.

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