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Related Experiment Videos

Complex bird clocks.

E Gwinner1, R Brandstätter

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

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|November 17, 2001
PubMed
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Bird circadian clocks use the pineal gland, hypothalamus, and retina to maintain daily rhythms. This complex system helps birds adapt to diverse environments and changing conditions.

Area of Science:

  • Chronobiology
  • Avian Physiology
  • Neuroendocrinology

Background:

  • The avian circadian pacemaking system integrates the pineal gland, hypothalamus, and retina.
  • These components interact to generate a self-sustained circadian output, with varying contributions between species and individuals.
  • Environmental factors like season and light influence the system's properties, partly via melatonin rhythm changes.

Purpose of the Study:

  • To explore the functional significance of variability in avian circadian clock properties.
  • To understand how the avian circadian system adapts to environmental challenges such as extreme photoperiods and migration.
  • To investigate the role of the pineal melatonin rhythm in photoperiodic information processing.

Main Methods:

  • The abstract does not specify methods, but implies analysis of avian circadian system components and melatonin rhythms.

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  • Comparative analysis across species and individual states (annual cycle, photic environment) is suggested.
  • Functional significance was inferred through proposed roles in adaptation and photoperiodism.

    • Main Results:

    • The avian circadian system comprises the pineal gland, hypothalamus, and retina, interacting to produce robust daily rhythms.
    • Variability in the system's properties, mediated by melatonin rhythm changes, is functionally important for adaptation.
    • The pineal melatonin rhythm can retain photoperiodic information, suggesting a role in photoperiodic after-effects.

    Conclusions:

    • Complex avian circadian clocks have evolved to help birds cope with environmental complexity.
    • The adaptability of the circadian system is crucial for survival in diverse and changing conditions.
    • The pineal gland's melatonin rhythm plays a key role in both rhythm generation and environmental time-keeping.