Circadian Function in Photoperiodic Induction of Gonadotropin-Secretion in White-Crowned Sparrow, Zonotrichia-Leucophrys-Gambelii

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[edit] Author(s)

  • Follett, B. K.
  • Mattocks, P. W.
  • Farner, D. S.

[edit] Journal

Proceedings of the National Academy of Sciences of the United States of America 71.5 (1974): 1666-69.

[edit] Abstract

Photosensitive White-crowned Sparrows (Zonotrirhin leucophrys gamhelii) previously maintained on short day lengths (8-hr light; 16-hr darkness) were transferred to complete darltness. At various intervals thereafter (2-100 hr)they were exposed to a single 8-hr light period. To determine if the light period had been induetivr, plasma luteinizing-hormone concentration was measured by radioimmunoassay in blood samples taken before and after the light period. lnductive light periods recurred at approximately daily intervals. The data provide further evidence for the involvement of a circadian rhythm in time measurement in the photopei.iodic responses of birds.

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