Persistence of circannual rhythms in ground squirrels with lesions of the suprachiasmatic nuclei

John Dark, Gary E Pickard, Irving Zucker

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Golden-mantled ground squirrels (Spermophilus lateralis) sustained complete ablation of the suprachiasmatic nuclei (SCN) while being maintained under constant conditions of photoperiod, temperature and food availability. After SCN ablation, most squirrels observed for up to 3 years postsurgically underwent normal circannual cycles in body mass. Other squirrels with similar SCN damage evidenced various anomalies in their circannual body weight cycles. Response of squirrels to SCN ablation was not related to the phase of the annual cycle in which lesions were produced. The variable nature of the SCN ablation on circannual body mass cycles suggests that the SCN are non-essential components of the system underlying the generation or expression of circannual rhythms.

Original languageEnglish (US)
Pages (from-to)201-207
Number of pages7
JournalBrain Research
Volume332
Issue number2
DOIs
StatePublished - Apr 22 1985

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Sciuridae
Suprachiasmatic Nucleus
Photoperiod
Body Weight
Food
Temperature

Keywords

  • annual cycles
  • body mass
  • circadian rhythms
  • circannual rhythms
  • squirrels
  • suprachiasmatic nuclei

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology

Cite this

Persistence of circannual rhythms in ground squirrels with lesions of the suprachiasmatic nuclei. / Dark, John; Pickard, Gary E; Zucker, Irving.

In: Brain Research, Vol. 332, No. 2, 22.04.1985, p. 201-207.

Research output: Contribution to journalArticle

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