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The salamander, Plethodon cinereus, shows a diurnal rhythm of locomotor activity, both in alternating 12-hour periods of light and darkness, and in continuous darkness. 2. The diurnal rhythm is strongly modified by a depressive influence that is apparently associated with the time of lunar zenith. 3. The activity of the animal at any given time is a function of the diurnal and lunar influences operative at that time. 4. The significance of the rhythm to the animal in nature is discussed.
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Charles L. Ralph (1957) studied this question.
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