Physiological adaptations to fasting in an actively wintering canid, the Arctic blue fox (Alopex lagopus)
Identifieur interne : 000817 ( Main/Exploration ); précédent : 000816; suivant : 000818Physiological adaptations to fasting in an actively wintering canid, the Arctic blue fox (Alopex lagopus)
Auteurs : Anne-Mari Mustonen [Finlande] ; Teija Pyykönen [Finlande] ; Matti Puukka [Finlande] ; Juha Asikainen [Finlande] ; Sari H Nninen [Finlande] ; Jaakko Mononen [Finlande] ; Petteri Nieminen [Finlande]Source :
- Journal of Experimental Zoology Part A: Comparative Experimental Biology [ 1548-8969 ] ; 2006-01-01.
Abstract
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. J. Exp. Zool. 305A:32–46, 2006. © 2005 Wiley‐Liss, Inc.
Url:
DOI: 10.1002/jez.a.241
Affiliations:
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Exp. Zool.</title><idno type="ISSN">1548-8969</idno><idno type="eISSN">1552-499X</idno><imprint><publisher>Wiley Subscription Services, Inc., A Wiley Company</publisher><pubPlace>Hoboken</pubPlace><date type="published" when="2006-01-01">2006-01-01</date><biblScope unit="volume">305A</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="32">32</biblScope><biblScope unit="page" to="46">46</biblScope></imprint><idno type="ISSN">1548-8969</idno></series><idno type="istex">469E8CA119A07D7AF97C05DA9E13B335ED4322A8</idno><idno type="DOI">10.1002/jez.a.241</idno><idno type="ArticleID">JEZ241</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1548-8969</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">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. J. Exp. Zool. 305A:32–46, 2006. © 2005 Wiley‐Liss, Inc.</div></front></TEI><affiliations><list><country><li>Finlande</li></country></list><tree><country name="Finlande"><noRegion><name sortKey="Mustonen, Anne Ari" sort="Mustonen, Anne Ari" uniqKey="Mustonen A" first="Anne-Mari" last="Mustonen">Anne-Mari Mustonen</name></noRegion><name sortKey="Asikainen, Juha" sort="Asikainen, Juha" uniqKey="Asikainen J" first="Juha" last="Asikainen">Juha Asikainen</name><name sortKey="H Nninen, Sari" sort="H Nninen, Sari" uniqKey="H Nninen S" first="Sari" last="H Nninen">Sari H Nninen</name><name sortKey="Mononen, Jaakko" sort="Mononen, Jaakko" uniqKey="Mononen J" first="Jaakko" last="Mononen">Jaakko Mononen</name><name sortKey="Mustonen, Anne Ari" sort="Mustonen, Anne Ari" uniqKey="Mustonen A" first="Anne-Mari" last="Mustonen">Anne-Mari Mustonen</name><name sortKey="Nieminen, Petteri" sort="Nieminen, Petteri" uniqKey="Nieminen P" first="Petteri" last="Nieminen">Petteri Nieminen</name><name sortKey="Puukka, Matti" sort="Puukka, Matti" uniqKey="Puukka M" first="Matti" last="Puukka">Matti Puukka</name><name sortKey="Pyykonen, Teija" sort="Pyykonen, Teija" uniqKey="Pyykonen T" first="Teija" last="Pyykönen">Teija Pyykönen</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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