Document Detail

Short-term thermoregulatory adjustments in a South American anseriform, the black-necked swan (Cygnus melanocoryphus).
MedLine Citation:
PMID:  18511316     Owner:  NLM     Status:  MEDLINE    
Avian bioenergetic studies suggest that, compared with other vertebrates, birds are efficient thermoregulators. However, most avian physiological studies have been performed in species of small body masses (less than 1 kg). In contrast to what might be anticipated, thermoregulatory abilities of large, flying birds are scarcely studied, especially in temperate zones and aquatic systems. In order to determine short-term metabolic adjustment after thermal challenge, we studied the bioenergetics of a South American anseriform, the black-necked swan (Cygnus melanocoryphus). Our results suggest that this swan species exhibits lower resting metabolic rate compared with other anseriforms, and some hetherothermia. In addition, the black-necked swans in our study changed "wet" thermal conductance at different ambient temperatures. At our working Ta range (5, 10, 15, 20 and 25 degrees C) calculated values were considerably higher than expected (23%, 26%, 39% and 51% higher than expected, respectively). Our results differ considerably from the only two previous reports in swan species, suggesting that C. melanocoryphus, perhaps due to its temperate distribution, is more sensitive to changes in environmental temperature.
Roberto F Nespolo; Paulina Artacho; Claudio Verdugo; Luis E Castañeda
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-04-24
Journal Detail:
Title:  Comparative biochemistry and physiology. Part A, Molecular & integrative physiology     Volume:  150     ISSN:  1531-4332     ISO Abbreviation:  Comp. Biochem. Physiol., Part A Mol. Integr. Physiol.     Publication Date:  2008 Jul 
Date Detail:
Created Date:  2008-06-16     Completed Date:  2008-07-11     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9806096     Medline TA:  Comp Biochem Physiol A Mol Integr Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  366-8     Citation Subset:  IM    
Instituto de Ecología y Evolución, Universidad Austral de Chile, Casilla 567, Valdivia, Chile.
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MeSH Terms
Anseriformes / physiology*
Body Temperature Regulation / physiology*
South America
Thermal Conductivity
Time Factors

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

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