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Related Experiment Videos

Locomotor and feeding activity rhythms in a light-entrained diurnal rodent, Octodon degus.

R García-Allegue1, P Lax, A M Madariaga

  • 1Department of Physiology and Pharmacology (Animal Physiology Unit), University of Murcia, 30100 Murcia, Spain. rallegue@fcu.um.es

The American Journal of Physiology
|August 13, 1999
PubMed
Summary

Octodon degus exhibits a bimodal circadian rhythm for wheel running (WR) activity, with distinct dawn and dusk peaks. Feeding activity (FA) in this diurnal rodent appears largely arrhythmic, suggesting distinct regulatory mechanisms for these behaviors.

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Area of Science:

  • Chronobiology
  • Animal Behavior
  • Rodent Physiology

Background:

  • Octodon degus, a diurnal rodent, is a novel laboratory model.
  • Understanding circadian rhythms is crucial for animal welfare and research.
  • Previous studies on degu activity patterns under varying light conditions are limited.

Purpose of the Study:

  • To investigate the circadian rhythmicity of wheel running (WR) and feeding activity (FA) in Octodon degus.
  • To determine the influence of different lighting conditions on these behaviors.
  • To elucidate the underlying temporal organization of activity in this species.

Main Methods:

  • Recording wheel running and feeding activity under various light-dark cycles (LD 12:12, LD 0.5:11.5, LD 0.5:23.5) and constant darkness (DD).

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  • Analyzing activity patterns to identify circadian, crepuscular, or arrhythmic components.
  • Assessing anticipatory activity and potential endogenous origins of observed rhythms.

    • Main Results:

    • Wheel running activity displayed a bimodal crepuscular pattern under LD 12:12 and skeleton photoperiods, with anticipatory peaks at dawn and dusk.
    • This bimodal pattern shifted to unimodal under LD 0.5:23.5 and constant darkness.
    • Feeding activity was predominantly arrhythmic, particularly under constant darkness, with no significant circadian rhythm observed in most individuals.

    Conclusions:

    • The wheel running rhythm in Octodon degus is strongly circadian and bimodal, suggesting the involvement of multiple oscillators.
    • The feeding strategy of degus appears primarily arrhythmic, contrasting with their structured wheel running behavior.
    • These findings highlight a complex temporal organization in Octodon degus, with distinct circadian control over locomotion versus feeding.