Melatonin: Effects on the circadian locomotor rhythm of sparrows

Fred W. Turek*, Joseph P. McMillan, Michael Menaker

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

124 Scopus citations


The continuous administration of low levels of melatonin via intraperitoneally placed Silastic capsules either (i) shortened the free-running period of activity or (ii) induced continuous activity in house sparrows (Passer domesticus) maintained in constant darkness. After the melatonin-filled capsules were removed, the period of the circadian rhythm of activity lengthened in rhythmic birds and normal rhythmicity was restored in continuously active birds. The results suggest that melatonin is involved in the physiological control of circadian rhythmicity in sparrows.

Original languageEnglish (US)
Pages (from-to)1441-1443
Number of pages3
Issue number4272
StatePublished - Jan 1 1976

ASJC Scopus subject areas

  • General


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