Abstract

The field cricket, G. campestris, is normally active during the daytime. The 24-hr rhythm of activity and rest persists in constant darkness, its phase being temperature-independent. The internal “clock” system of the insect can be reset by brief exposure to light, or by return to higher temperatures after a period at 5°C. It can be reset by light even when locomotory activity has been suppressed by drought. The suggestion is made that this may be achieved by the synchronization of a number of internal “clocks” whose phase duration is innate.

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