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Sleep, Hypometabolism, and Torpor in Birds

  • H. Craig Heller
Part of the NATO ASI Series book series (ASIAS, volume 173)

Abstract

Endothermy is energetically expensive, yet it has enabled birds and mammals to exploit a wide variety of extreme habitats where energy demands are high and food is frequently scarce. Increased energy demand coupled with decreased opportunity to feed may occur on a daily or on a seasonal basis. It is not surprising, therefore, that endotherms have evolved adaptations to reduce energy expenditure on daily and seasonal time scales. The oldest and most ubiquitous of these adaptations may be sleep. The argument has been advanced that specifically slow wave sleep, (SWS), also known as non-rapid eye movement (NREM) sleep evolved in parallel with endothermy as a means of reducing energy expenditure during the portion of the day that the animals were inactive (Walker & Berger, 1980). More extreme forms of adaptive hypometabolism, and shallow, daily torpor, and deep hibernation, may have evolved from the general mammalian and avian phenomenon of sleep (Heller et al, 1978).

Keywords

Circadian Rhythm Food Deprivation Avian Species Slow Wave Sleep NREM Sleep 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1989

Authors and Affiliations

  • H. Craig Heller
    • 1
  1. 1.Department of Biological SciencesStanford UniversityStanfordUSA

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