Circadian rhythmicity and the initiation of gonadal growth in sparrows

Fred W. Turek*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


White-crowned and golden-crowned sparrows were held under a variety of light cycles in which a main 8-hour light period was combined with dark periods of varying durations. Gonadal growth was not observed in birds under cycles of 24-(8L:16D), 48-(8L:40D) or 72-hours (8L:64D). Growth was initiated in sparrows under cycles of 36-(8L:28D) and 60-hours (8L:52D). These results are consistent with the hypothesis that circadian rhythmicity is involved in photoperiodic time measurement during the initiation of gonadal growth in birds.

Original languageEnglish (US)
Pages (from-to)59-64
Number of pages6
JournalJournal of Comparative Physiology
Issue number1
StatePublished - Mar 1 1974

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Physiology
  • Animal Science and Zoology
  • Behavioral Neuroscience


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