| Physiological adaptations to fasting in an actively wintering canid, the Arctic blue fox (Alopex lagopus). | |
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MedLine Citation:
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PMID: 16358268 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study investigated the physiological adaptations to fasting using the farmed blue fox (Alopex lagopus) as a model for the endangered wild arctic fox. Sixteen blue foxes were fed throughout the winter and 32 blue foxes were fasted for 22 d in Nov-Dec 2002. Half of the fasted blue foxes were food-deprived again for 22 d in Jan-Feb 2003. The farmed blue fox lost weight at a slower rate (0.97-1.02% body mass d(-1)) than observed previously in the arctic fox, possibly due to its higher initial body fat content. The animals experienced occasional fasting-induced hypoglycaemia, but their locomotor activity was not affected. The plasma triacylglycerol and glycerol concentrations were elevated during phase II of fasting indicating stimulated lipolysis, probably induced by the high growth hormone concentrations. The total cholesterol, HDL- and LDL-cholesterol, urea, uric acid and total protein levels and the urea:creatinine ratio decreased during fasting. Although the plasma levels of some essential amino acids increased, the blue foxes did not enter phase III of starvation characterized by stimulated proteolysis during either of the 22-d fasting procedures. Instead of excessive protein catabolism, it is liver dysfunction, indicated by the increased plasma bilirubin levels and alkaline phosphatase, alanine aminotransferase and aspartate aminotransferase activities, that may limit the duration of fasting in the species. |
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Authors:
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Anne-Mari Mustonen; Teija Pyykönen; Matti Puukka; Juha Asikainen; Sari Hänninen; Jaakko Mononen; Petteri Nieminen |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of experimental zoology. Part A, Comparative experimental biology Volume: 305 ISSN: 1548-8969 ISO Abbreviation: J. Exp. Zoolog. Part A Comp. Exp. Biol. Publication Date: 2006 Jan |
Date Detail:
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Created Date: 2005-12-21 Completed Date: 2006-02-09 Revised Date: 2009-10-05 |
Medline Journal Info:
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Nlm Unique ID: 101168223 Medline TA: J Exp Zool A Comp Exp Biol Country: United States |
Other Details:
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Languages: eng Pagination: 32-46 Citation Subset: IM |
Affiliation:
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Department of Biology, University of Joensuu, Finland. ammusto@cc.joensuu.fi |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Acclimatization
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physiology* Analysis of Variance Animals Blood Glucose / physiology Body Mass Index Body Temperature / physiology Body Weight / physiology Fasting / blood, physiology* Female Food Deprivation / physiology* Foxes / blood, metabolism* Lipids / blood Male Motor Activity Seasons* |
| Chemical | |
Reg. No./Substance:
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0/Blood Glucose; 0/Lipids |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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