Seasonal variations in the diurnal rhythm of pituitary prolactin content in the white-throated sparrow, Zonotrichia albicollis |
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| Authors: | A H Meier J T Burns J W Dusseau |
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| Affiliation: | 1. Faculty of Medicine, McGill University, Montréal, QC;2. Department of Obstetrics and Gynecology, McGill University Health Centre, Montréal, QC;1. Laboratoire de Biochimie et de Biologie Moléculaire, Hôpital Bretonneau, CHRU de Tours, 2, Bd Tonnellé, 37044 Tours Cedex 1, France;2. Unité INSERM U930, équipe “neurogénétique et neurométabolomique”, Université François Rabelais, 10 BD Tonnellé, BP 3223, 37032 Tours Cedex 1, France;3. Department of Endocrinology, CHRU de Tours, 2 Bd Tonnellé, 37044 Tours Cedex 1, France |
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| Abstract: | Marked diurnal rhythms of pituitary prolactin content occur both in May and in August. However, the phase of the rhythm with respect to the photoperiod differs at the two seasons. In May, the peak occurs at noon, but in August it occurs at midnight. It is concluded that the time of the diurnal release of pituitary prolactin is an important regulator of seasonal physiological and behavioral conditions in the White-throated Sparrow. |
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