NDLI: Cold- and exercise-induced peak metabolic rates in tropical birds

Content Provider	PubMed Central
Author	Wiersma, Popko Chappell, Mark A. Williams, Joseph B.
Copyright Year	2007
Abstract	Compared with temperate birds, tropical birds have low reproductive rates, slow development as nestlings, and long lifespans. These “slow” life history traits are thought to be associated with reduced energy expenditure, or a slow “pace of life.” To test predictions from this hypothesis, we measured exercise-induced peak metabolic rates (PMRE) in 45 species of tropical lowland forest birds and compared these data with PMRE for three temperate species. We also compared cold-induced PMR (PMRC) with PMRE in the same individuals of 19 tropical species. Tropical birds had a 39% lower PMRE than did the temperate species. In tropical birds, PMRC and PMRE scaled similarly with body mass (M b), but PMRE was 47% higher than PMRC. PMRE averaged 6.44 × basal metabolic rate (BMR) and PMRC averaged 4.52 × BMR. The slope of the equation relating PMRE to M b exceeded the slope for the equation for BMR vs. M b, whereas slopes for the equations of PMRC and BMR vs. M b did not differ. M b-adjusted residuals of PMRE were positively correlated with residual BMR, whereas residual PMRC and residual BMR were not correlated. PMRE and PMRC were not correlated after we corrected for M b. Temperate birds maintained their body temperature at an 8.6°C lower average air temperature than did tropical species. The lower PMRE values in tropical species suggest that their suite of life history traits on the slow end of the life history continuum are associated with reduced metabolic rates.
Related Links	http://dx.doi.org/10.1073/pnas.0707683104
Ending Page	20871
Page Count	6
Starting Page	20866
File Format	PDF
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	52
Volume Number	104
Language	English
Publisher	National Academy of Sciences
Publisher Date	2007-12-26
Access Restriction	Open
Rights Holder	National Academy of Sciences
Subject Keyword	General Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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