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Circadian rhythms of plasma melatonin in the ruin lizard Podarcis sicula: effects of pinealectomy



Circadian rhythms of plasma melatonin in the ruin lizard Podarcis sicula: effects of pinealectomy



Journal of Pineal Research 12(3): 109-113



Plasma melatonin was measured in lizards (Podarcis sicula) at six different times of day under conditions of constant temperature and darkness. Intact animals showed a circadian rhythm of melatonin with a peak in the subjective night of 207 pg/ml (median) and a trough during the subjective day that was below the minimum detection level of the assay (50 pg/ml). Pinealectomy abolished the circadian rhythm of plasma melatonin; median levels were near or below the minimum detection level at all times sampled. The data suggest that the pineal is the only source of rhythmic blood-borne melatonin in Podarcis sicula, and are consistent with the hypothesis that changes in the free-running period of the locomotor rhythm induced by pinealectomy in this species are due to withdrawal of rhythmic melatonin from the blood.

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Accession: 039555459

Download citation: RISBibTeXText

PMID: 1507055

DOI: 10.1111/j.1600-079x.1992.tb00036.x


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