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Journal of Biological Rhythms
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Circannual Rhythms in Starlings: Response of Castrated Birds to 12-Hr Days Depends on Photoperiodic History

A. Dawson

NERC Institute of Terrestrial Ecology, Monks Woods, Abbots Ripton, Huntingdon, Cambridgeshire PE17 2LS, United Kingdom

F.J. McNaughton

NERC Institute of Terrestrial Ecology, Monks Woods, Abbots Ripton, Huntingdon, Cambridgeshire PE17 2LS, United Kingdom

The annual cycle of reproductive function in starlings (Sturnus vulgaris) is driven by seasonal changes in daylength and consists of a 6-month period of photosensitivity, culminating in maximal gonadal development, followed by a 6-month period of photorefractoriness. If male starlings are held under a constant photoperiod of 12 hr of light per day (LD 12:12), some individuals show circannual rhythms of testicular size. Do these rhythms consist of alternating periods of photosensitivity and photorefractoriness, and does the response depend on whether daylength is increased or decreased to 12 hr?

Key Words: starling • circannual rhythm • photoperiodism • photorefractoriness • luteinizing hormone • molt • castration

Journal of Biological Rhythms, Vol. 8, No. 2, 141-150 (1993)
DOI: 10.1177/074873049300800204
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