Abstract
Most of the active individuals ofCarabus cancellatus (Coleoptera) investigated were synchronized by ‘zeitgeber’-lengths of 8/8 10/10 or 16/16 h. On the other hand, a smaller number of beetles lost the periodicities of these ‘Zeitgebers’ and showed a circadian activity rhythm. According to these experiments, the existence of a self-sustained circadian oscillation in carabid beetles is demonstrated. As we believe, a special numerical method of computing the length of activity periodicities was used for the first time.
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