Entry into hibernation in M. Flaviventris: Sleep and behavioral thermoregulation

Virginia M Miller, Frank E. South

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Hibernators of the genus Marmota (wt=3-5 kg) differ from smaller hibernators (wt<1 kg) in thermoregulatory characteristics during entry into hibernation. They might be expected to differ also with respect to the distributions of activity, awake and sleep states during entry. Marmots implanted stereotaxically with electrodes to record electroencephalograms and brain temperature (TBr) were monitored remotely by a polygraph as well as video transmission as they entered hibernation. During entry, awake (A), slow wave sleep (SWS), and paradoxical sleep (PS) states could be identified. Activity which included nest building, grooming, and shivering slowed entry and became progressively more stereotyped as TBr decreased. All animals exhibited at least one PS bout between TBr=33-32°C. SWS as percent of total sleep increased (80 to 92%) as TBr decreased from 35-25°C. This increase represented a decrease in number and increase in duration of SWS episodes. The length of individual SWS and PS episodes of the marmot did not differ from those reported in Citellus. These data suggest that entry into hibernation is a more complex phenomenon than merely an extension of slow wave sleep. Similar changes in arousal state distribution occur in hibernators of different sizes.

Original languageEnglish (US)
Pages (from-to)989-993
Number of pages5
JournalPhysiology and Behavior
Volume27
Issue number6
DOIs
StatePublished - 1981
Externally publishedYes

Keywords

  • Arousal states
  • Hibernation
  • Hibernation entry
  • M. flaviventris
  • Marmot
  • Paradoxical sleep
  • Sleep
  • Slow wave sleep
  • Thermoregulation

ASJC Scopus subject areas

  • Physiology (medical)
  • Behavioral Neuroscience

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