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Journal of Biological Rhythms
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Two Circadian Rhythms in Pairs of Sparrows

Sue Binkley

Biology Department, Temple University, Philadelphia, Pennsylvania 19122

Karen Mosher

Biology Department, Temple University, Philadelphia, Pennsylvania 19122

Circadian rhythms of perch-hopping activity were recorded for over 200 days from pairs of house sparrows (Passer domesticus) kept in the same cage and treated with a light- dark cycle (LD 12:12), with constant light (LL), and with constant dark (DD). Most pairs entrained to the LD 12:12 cycle and exhibited free-running circadian rhythms in LL and DD. Two rhythms were visible in the records of 40% of the pairs in DD and in 50% of the pairs in LL. Otherwise, free-running pairs displayed a single circadian rhythm of perching activity.

Journal of Biological Rhythms, Vol. 3, No. 3, 249-254 (1988)
DOI: 10.1177/074873048800300303
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