Document Detail

Scaling of basal metabolic rate with body mass and temperature in mammals.
MedLine Citation:
PMID:  20180875     Owner:  NLM     Status:  MEDLINE    
1. We present a statistical analysis of the scaling of resting (basal) metabolic rate, BMR, with body mass, B(m) and body temperature, T(b), in mammals. 2. Whilst the majority of the variance in ln BMR is explained by ln B(m), the T(b) term is statistically significant. The best fit model was quadratic, indicating that the scaling of ln BMR with ln B(m) varies with body size; the value of any scaling exponent estimated for a sample of mammals will therefore depend on the size distribution of species in the study. This effect can account for much of the variation in scaling exponents reported in the literature for mammals. 3. In all models, inclusion of T(b) reduced the strength of scaling with ln B(m). The model including T(b) suggests that birds and mammals have a similar underlying thermal dependence of BMR, equivalent to a Q(10) of 2.9 across the range of T(b) values 32-42 degrees C. 4. There was significant heterogeneity in both the mass scaling exponent and mean BMR across mammalian orders, with a tendency for orders dominated by larger taxa to have steeper scaling exponents. This heterogeneity was particularly marked across orders with smaller mean B(m) and the taxonomic composition of the sample will thus also affect the observed scaling exponent. After correcting for the effects of ln B(m) and T(b), Soricomorpha, Didelphimorphia and Artiodactyla had the highest BMR of those orders represented by more than 10 species in the data set. 5. Inclusion of T(b) in the model removed the effect of diet category evident from a model in ln B(m) alone and widely reported in the literature; this was caused by a strong interaction between diet category and T(b) in mammals. 6. Inclusion of mean ambient temperature, T(a), in the model indicated a significant inverse relationship between ln BMR and T(a), complicated by an interaction between T(a) and T(b). All other things being equal, a polar mammal living at -10 degrees C has a body temperature approximately 2.7 degrees C warmer and a BMR higher by approximately 40% than a tropical mammal of similar size living at 25 degrees C.
Andrew Clarke; Peter Rothery; Nick J B Isaac
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Publication Detail:
Type:  Journal Article     Date:  2010-02-18
Journal Detail:
Title:  The Journal of animal ecology     Volume:  79     ISSN:  1365-2656     ISO Abbreviation:  J Anim Ecol     Publication Date:  2010 May 
Date Detail:
Created Date:  2010-04-22     Completed Date:  2010-07-29     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376574     Medline TA:  J Anim Ecol     Country:  England    
Other Details:
Languages:  eng     Pagination:  610-9     Citation Subset:  IM    
British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK.
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MeSH Terms
Body Temperature / physiology*
Body Weight / physiology*
Databases, Factual
Energy Metabolism / physiology*
Feeding Behavior / physiology
Linear Models
Mammals / classification,  genetics,  physiology*
Models, Biological*
Reg. No./Substance:
0/Environ; 0/Phenols

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

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