Melatonin: A coupling device between oscillators in the circadian system of the ruin lizard Podarcis sicula |
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Institution: | Dipartimento di Scienze del Comportamento Animale e dell''Uomo, via Volta 6, 56126 Pisa, Italy (Tel. +39-50-20447; Fax +39-50-24653) |
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Abstract: | - 1.1. Chronic administration of melatonin (in silastic capsules) lengthened the free-running period of the locomotor rhythm and shortened the circadian activity time in Podarcis sicula held in constant temperature and darkness.
- 2.2. Lizards displaying a bimodal pattern of activity invariably became unimodal after melatonin administration.
- 3.3. The results support the hypothesis that melatonin acts as a coupling device between circadian oscillators driving the locomotor rhythm in Podarcis sicula.
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