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Hibernation: when good clocks go cold.

Norman F Ruby1

  • 1Department of Biological Sciences, Stanford University, Stanford, CA 94305-5020, USA. ruby@stanford.edu

Journal of Biological Rhythms
|August 23, 2003
PubMed
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Hibernating animals reveal how the circadian system, particularly the suprachiasmatic nucleus (SCN), times torpor and influences hibernation. This research offers insights into general chronobiology and energy balance.

Area of Science:

  • Chronobiology
  • Physiology
  • Animal Behavior

Background:

  • Hibernating animals serve as key models for understanding physiological systems.
  • Extensive research over 50 years highlights the circadian system's role in winter torpor in birds and mammals.
  • This research also informs circadian function in non-hibernating species.

Purpose of the Study:

  • To review the role of the circadian system in hibernation and torpor.
  • To explore how this research applies to general chronobiology questions.
  • To examine suprachiasmatic nucleus (SCN) function in hibernators.

Main Methods:

  • Literature review of studies on circadian rhythms and hibernation.
  • Analysis of research on birds and mammals exhibiting torpor.

Related Experiment Videos

  • Synthesis of findings related to temperature compensation and entrainment models.

    • Main Results:

    • Convergent evidence indicates the SCN times daily torpor.
    • The SCN plays a role in controlling hibernation parameters.
    • The SCN may have a noncircadian function in energy balance for hibernators.

    Conclusions:

    • The suprachiasmatic nucleus (SCN) is crucial for timing torpor and regulating hibernation.
    • SCN function in hibernators extends beyond circadian pacing to energy balance.
    • This field provides valuable insights into fundamental chronobiological processes.