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The Journal of Experimental Biology 205, 101-107 (2002)
© 2002 The Company of Biologists Limited

Passerines versus nonpasserines: so far, no statistical differences in the scaling of avian energetics

Enrico L. Rezende¹, David L. Swanson², F. Fernando Novoa³ and Francisco Bozinovic^1,*

¹ Departamento de Ecología, Facultad de Ciencias Biológicas, P. Universidad Católica de Chile, Casilla 114-D, Santiago, Chile,
² Department of Biology, University of South Dakota, Vermillion, SD 57069-2390, USA and
³ Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile

*Author for correspondence (e-mail: fbozinov{at}genes.bio.puc.cl)

Accepted 17 October 2001

We analyzed and compared the scaling of both basal and maximal thermogenic metabolic rates in passerine and nonpasserine birds using conventional and phylogenetic methods. In spite of the presumed adaptive importance of both metabolic traits, few studies concerning both their relationships and their ecological and evolutionary constraints have been conducted. We found no statistical differences in the scaling of maximal metabolic rate between passerines and nonpasserines; hence, we suggest the use of a single allometric regression for this trait in birds. In addition, basal and maximal metabolic rates were indeed correlated after removing the effects of body mass and phylogeny. The apparent generality of this correlation within both birds and mammals reinforces the need for general ecological and physiological explanations for the evolution of endothermy.

Key words: basal metabolic rate, maximal metabolic rate, bird, body size, endothermy, phylogeny.

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