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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 Bozinovic1,*

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



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  		Fig. 1. Phylogenetic tree of birds based on Sibley and Ahlquist (1990Go) for maximal metabolic rate (MMR). Numbers represent the genetic distance between adjacent taxa according to DNA/DNA hybridization. In some cases, branch lengths were chosen arbitrarily (see Materials and methods). Asterisks indicate species that were not incorporated into the basal metabolic rate phylogenetic tree (see Table 1, where full genus names are given).

 


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  		Fig. 2. Scaling of basal (BMR) and maximal (MMR) metabolic rate in passerines (open circles) and nonpasserines (filled circles). Lines represent least-square regression for all data (equations are listed in Table 3).

 


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  		Fig. 3. Correlation between mass-independent basal (BMR) and maximal (MMR) metabolic rate after removing the effects of phylogeny. Contrasts were calculated according to Felsenstein (1985Go) and using residuals obtained after plotting BMR and MMR against body mass.

 

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