Document Detail

Ecological implications of body composition and thermal capabilities in young antarctic fur seals (Arctocephalus gazella).
MedLine Citation:
PMID:  15449238     Owner:  NLM     Status:  MEDLINE    
In comparison with other homeotherms, young recently weaned marine mammals in high latitudes face exceptional energetic demands when foraging and thermoregulating. Lipids are an important source of energy and a major component of insulation that allows them to meet these demands. To examine the role of lipid stores in a high-latitude pinniped, we measured the body composition and thermoregulatory capabilities of Antarctic fur seal (Arctocephalus gazella) pups and yearlings by using flow-through respirometry and hydrogen isotope dilution. From these data, we constructed a model to examine the importance of postweaning fasting capability in free-ranging young fur seals. Resting metabolic rates were different for pups and yearlings measured in 0.6 degrees C water, 10.3 degrees C water, and ambient air; however, mass and percent lipid as covariates accounted for the different metabolic responses in pups and yearlings for all treatments. The estimated lower critical temperature for combined pups and yearlings was 14.4 degrees C, 10 degrees -15 degrees C above water temperatures normally experienced by Antarctic fur seals. Modeling predicted that a weaned fur seal pup would survive at sea from 9.8 to 36.2 d before succumbing to starvation. The most likely maximum travel distance within this time constraint suggests that food resources close to the natal rookery are important to first-year survival for this species.
Matthew R Rutishauser; Daniel P Costa; Michael E Goebel; Terrie M Williams
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Physiological and biochemical zoology : PBZ     Volume:  77     ISSN:  1522-2152     ISO Abbreviation:  Physiol. Biochem. Zool.     Publication Date:    2004 Jul-Aug
Date Detail:
Created Date:  2004-09-27     Completed Date:  2004-12-21     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:  669-81     Citation Subset:  IM    
Long Marine Laboratory, 100 Shaffer Road, Santa Cruz, CA 95060, USA.
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MeSH Terms
Age Factors
Antarctic Regions
Basal Metabolism
Body Composition / physiology*
Body Temperature
Body Temperature Regulation / physiology*
Calorimetry, Indirect
Energy Metabolism / physiology*
Feeding Behavior / physiology
Fur Seals / physiology*
Models, Biological*
Sex Factors

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

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