Document Detail

Exposure to cold but not exercise increases carbon turnover rates in specific tissues of a passerine.
MedLine Citation:
PMID:  20086139     Owner:  NLM     Status:  MEDLINE    
Carbon turnover differs between tissues within an animal, but the extent to which ecologically relevant increases in metabolism affect carbon turnover rates is largely unknown. We tested the energy expenditure and protein turnover hypotheses that predict increased carbon turnover, either in association with increased daily energy expenditure, or in concert with tissue-specific increased protein metabolism. We used stable-isotope-labeled diets to quantify the rate of carbon turnover in 12 different tissues for three groups of zebra finches (Taeniopygia guttata): cold-exposed birds kept at ambient temperatures below their thermoneutral zone, exercised birds that were flown for 2 h per day in a flight arena, and control birds that were kept at ambient temperatures within their thermoneutral zone and that were not exercised. We found that increases in metabolism associated with cold-exposure but not exercise produced measurable increases in carbon turnover rate of, on average, 2.4+/-0.3 days for pectoral muscle, gizzard, pancreas and heart, even though daily energy intake was similar for exercised and cold-exposed birds. This evidence does not support the energy expenditure hypothesis, and we invoke two physiological processes related to protein metabolism that can explain these treatment effects: organ mass increase and tissue-specific increase in activity. Such changes in carbon turnover rate associated with cold temperatures translate into substantial variation in the estimated time window for which resource use is estimated and this has important ecological relevance.
U Bauchinger; J Keil; R A McKinney; J M Starck; S R McWilliams
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  The Journal of experimental biology     Volume:  213     ISSN:  1477-9145     ISO Abbreviation:  J. Exp. Biol.     Publication Date:  2010 Feb 
Date Detail:
Created Date:  2010-01-20     Completed Date:  2010-03-16     Revised Date:  2010-05-19    
Medline Journal Info:
Nlm Unique ID:  0243705     Medline TA:  J Exp Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  526-34     Citation Subset:  IM    
Department Biology II, University of Munich (LMU), Grosshaderner Strasse 2, 82152 Planegg-Martinsried, Germany.
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MeSH Terms
Analysis of Variance
Body Weight
Carbon / metabolism*
Carbon Isotopes
Cold Temperature*
Energy Metabolism
Feeding Behavior
Finches / anatomy & histology,  metabolism*
Models, Biological
Organ Size
Organ Specificity*
Physical Conditioning, Animal*
Time Factors
Reg. No./Substance:
0/Carbon Isotopes; 7440-44-0/Carbon

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

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