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Biol Bull 113: 188-197. (August 1957)
© 1957 Marine Biological Laboratory
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A DIURNAL ACTIVITY RHYTHM IN PLETHODON CINEREUS AND ITS MODIFICATION BY AN INFLUENCE HAVING A LUNAR FREQUENCY

CHARLES L. RALPH 1

1 Department of Biological Sciences, Northwestern University, Evanston, Illinois

1. 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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Copyright © 1957 by the Marine Biological Laboratory.