Abstract
The entrainment of Biological clocks by light cycles can be explained by the phase shifting effects of light pulses on the circadian pacemaker(s). This entrainment model can also be applied to photoperiodism, a circadian clock measuring seasonal changes in night length and controlling diapause in insects. This paper shows that data obtained from pupal eclosion phase response curves may be used, within a framework of “External coincidence”, to account for diapause induction in Sarcophaga argyrostoma. External coincidence is compared with “Internal coincidence” and “Hour-glass” models.
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