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Journal of Biological Rhythms
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Seasonal Variations in Circadian Rhythms Persist in Gonadectomized Golden-Mantled Ground Squirrels

Theresa M. Lee

Departments of Psychology and Integrative Biology, University of California, Berkeley, CA 94720

Irving Zucker

Departments of Psychology and Integrative Biology, University of California, Berkeley, CA 94720

Circadian wheel-running activity was monitored in intact and gonadectomized female and male golden-mantled ground squirrels maintained in a 14L:10D photoperiod at 21 °C. Marked advances in phase angle of activity onset and increases in the duration of the daily active phase occurred each year in intact animals coincident with the phase of reproductive activity. Surprisingly, long-term gonadectomized squirrels of both sexes manifested similar seasonal changes in the circadian system. Seasonal circadian variations in locomotor activity are generated by a circannual clock independent from and not influenced by concurrent changes in secretion of gonadal hormones.

Key Words: circannual • circadian • locomotor activity • body mass • gonadal hormones • ground squirrels

Journal of Biological Rhythms, Vol. 10, No. 3, 188-195 (1995)
DOI: 10.1177/074873049501000302
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