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Circannual rhythms in birds.

Eberhard Gwinner1

  • 1Max Planck Research Center for Ornithology, Department of Biological Rhythms and Behavior, Von-der-Tann-Str. 7, D 82346 Andechs, Germany. gwinner@erl.ornithol.mpg.de

Current Opinion in Neurobiology
|December 10, 2003
PubMed
Summary

Birds

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Area of Science:

  • Avian Biology
  • Chronobiology
  • Animal Behavior

Background:

  • Seasonal activities in birds, including reproduction and migration, are governed by internal biological clocks.
  • These internal rhythms, known as circannual rhythms, persist even under constant conditions but deviate from a 12-month period.
  • Day length (photoperiod) is a critical factor that allows these rhythms to be expressed and synchronized with the environment.

Purpose of the Study:

  • To investigate the role of endogenous circannual rhythms in controlling seasonal activities in birds.
  • To understand how photoperiod acts as a permissive and synchronizing factor for these rhythms.
  • To explore how environmental cues and learned behaviors influence these rhythms in different age groups.

Main Methods:

  • The study synthesizes existing research on avian circannual rhythms and photoperiodism.
  • It analyzes observations of bird behavior under controlled and natural conditions.
  • Comparative analysis of different populations and age groups is discussed.

Main Results:

  • Circannual rhythms regulate key seasonal activities like reproduction, molt, and migration in birds.
  • Photoperiod is essential for rhythm expression and synchronization, with equatorial birds potentially using light intensity.
  • Photoperiod also influences the pace of rhythm phases, ensuring optimal environmental adjustment.
  • Adaptive population-specific responses to photoperiod exist, and learned behaviors supplement innate rhythms in older birds.

Conclusions:

  • Endogenous circannual rhythms are fundamental to the seasonal organization of bird behavior.
  • Photoperiod acts as a crucial environmental cue for synchronizing and modulating these rhythms.
  • Circannual rhythms provide a framework for seasonal adaptation, influenced by both innate programs and learned experiences.

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