Document Detail

The effects of caloric restriction on the body composition and hibernation of the golden-mantled ground squirrel (Spermophilus lateralis).
MedLine Citation:
PMID:  11073788     Owner:  NLM     Status:  MEDLINE    
In preparation for hibernation, golden-mantled ground squirrels (Spermophilus lateralis) must deposit sufficient amounts of lipid during the summer to survive winter hibernation. We conducted an experiment from May 1998 to February 1999 to examine the effects of caloric restriction on the body composition (lipid and fat-free mass) and hibernation of golden-mantled ground squirrels. Ground squirrels were either provided with food ad lib. (controls) or with only enough food to maintain a constant body mass throughout the experiment (calorically restricted). Changes in body composition were followed using total body electrical conductivity (TOBEC). Implanted data loggers that recorded body temperature were used to determine when ground squirrels entered their first torpor bout and the lengths of torpor bouts. Body composition did not change in the calorically restricted ground squirrels between May and September, while both lipid and fat-free mass increased in the controls. However, from September to February, calorically restricted ground squirrels lost only fat-free mass, not lipid mass, but controls lost both lipid and fat-free mass. Calorically restricted ground squirrels entered their first torpor bout about 4 wk after controls, but the torpor bout duration (or length) during hibernation did not differ between the two groups. These results show that ground squirrels maintain body composition during caloric restriction, and the limited quantities of stored lipid have an effect on when hibernation begins but not on torpor bout length.
L K Pulawa; G L Florant
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Physiological and biochemical zoology : PBZ     Volume:  73     ISSN:  1522-2152     ISO Abbreviation:  Physiol. Biochem. Zool.     Publication Date:    2000 Sep-Oct
Date Detail:
Created Date:  2001-01-02     Completed Date:  2001-01-18     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100883369     Medline TA:  Physiol Biochem Zool     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  538-46     Citation Subset:  IM    
Department of Biology, Colorado State University, Fort Collins, CO 80523, USA.
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MeSH Terms
Body Composition / physiology*
Dietary Fats
Hibernation / physiology*
Lipids / blood
Sciuridae / physiology*
Reg. No./Substance:
0/Dietary Fats; 0/Lipids

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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