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Journal of Biological Rhythms
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Control of Annual Endocrine Rhythms in the Edible Dormouse: Nonprimary Effect of Photoperiod

Monique Jallageas

Laboratory of Endocrinological Neurobiology, URA 1197, CNRS, University of Montpellier , Place E. Bataillon, 34095 Montpellier Cedex 5, France

Nicole Mas

Laboratory of Endocrinological Neurobiology, URA 1197, CNRS, University of Montpellier , Place E. Bataillon, 34095 Montpellier Cedex 5, France

Janine Nouguier-Soulé

Laboratory of Endocrinological Neurobiology, URA 1197, CNRS, University of Montpellier , Place E. Bataillon, 34095 Montpellier Cedex 5, France

We investigated the extent to which photoperiodic fluctuations synchronize annual thyroid and gonadal rhythmicity in edible dormice. The effects of different daylength manipulations (LD 4:20, LD 6:18, LD 18:6, LD 20:4) were examined during the two critical ascending and regressive phases of the annual plasma testosterone and thyroxine cycles that correspond to naturally increasing or decreasing photoperiod variations. The data failed to demonstrate any essential photoperiodic contribution to control systems that generate these two annual biological rhythms in dormice.

Key Words: annual rhythms • photoperiod • testosterone • thyroxine • edible dormouse

Journal of Biological Rhythms, Vol. 6, No. 4, 343-352 (1991)
DOI: 10.1177/074873049100600405
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