NDLI: Thermoregulatory changes anticipate hibernation onset by 45 days: data from free-living arctic ground squirrels.

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Thermoregulatory changes anticipate hibernation onset by 45 days: data from free-living arctic ground squirrels.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Sheriff, Michael J. Williams, Cory T. Kenagy, G. J. Buck, C. Loren Barnes, Brian M.
Spatial Coverage	Arctic Regions
Description	Country affiliation: United States Author Affiliation: Sheriff MJ ( Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK 99775, USA. mjsheriff@alaska.edu)
Abstract	Hibernation is a strategy of reducing energy expenditure, body temperature (T(b)) and activity used by endotherms to escape unpredictable or seasonally reduced food availability. Despite extensive research on thermoregulatory adjustments during hibernation, less is known about transitions in thermoregulatory state, particularly under natural conditions. Laboratory studies on hibernating ground squirrels have demonstrated that thermoregulatory adjustments may occur over short intervals when animals undergo several brief, preliminary torpor bouts prior to entering multiday torpor. These short torpor bouts have been suggested to reflect a resetting of hypothalamic regions that control T(b) or to precondition animals before they undergo deep, multiday torpor. Here, we examined continuous records of T(b) in 240 arctic ground squirrels (Urocitellus parryii) prior to hibernation in the wild and in captivity. In free-living squirrels, T(b) began to decline 45 days prior to hibernation, and average T(b) had decreased 4.28 °C at the onset of torpor. Further, we found that 75 % of free-living squirrels and 35 % of captive squirrels entered bouts of multiday torpor with a single T(b) decline and without previously showing short preliminary bouts. This study provides evidence that adjustments in the thermoregulatory component of hibernation begin far earlier than previously demonstrated. The gradual reduction in T(b) is likely a component of the suite of metabolic and behavioral adjustments, controlled by an endogenous, circannual rhythm, that vary seasonally in hibernating ground squirrels.
File Format	HTM / HTML
ISSN	01741578
Issue Number	6
Volume Number	182
e-ISSN	1432136X
Journal	Journal of Comparative Physiology B
Language	English
Publisher	Springer
Publisher Date	2012-08-01
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Physiology Discipline Metabolism Discipline Biochemistry Body Temperature Regulation Physiology Hibernation Sciuridae Animals Arctic Regions Journal Article Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, Non-p.h.s.
Content Type	Text
Resource Type	Article
Subject	Physiology Biochemistry Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Endocrinology

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Thermoregulatory changes anticipate hibernation onset by 45 days: data from free-living arctic ground squirrels

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Thermoregulatory changes anticipate hibernation onset by 45 days: data from free-living arctic ground squirrels.

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Thermoregulatory changes anticipate hibernation onset by 45 days: data from free-living arctic ground squirrels.