Photoperiodism in House Sparrows: Testing for Induction with Nonphotic Zeitgebers

@article{Reebs1990PhotoperiodismIH,
  title={Photoperiodism in House Sparrows: Testing for Induction with Nonphotic Zeitgebers},
  author={St{\'e}phan G. Reebs and Nicholas Mrosovsky},
  journal={Physiological Zoology},
  year={1990},
  volume={63},
  pages={587 - 599}
}
In birds, as in other animals, the mechanism for photoperiodic time measurement is based on circadian rhythmicity. In models of this mechanism, the entrainment of circadian rhythms is a key feature. One can therefore ask whether any synchronizing agent (zeitgeber) that can entrain circadian rhythms could also induce photoperiodic responses. We addressed this question using known nonphotic circadian zeitgebers (playbacks of conspecific vocalizations, and nonspecific acoustic disturbance) in… 
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