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http://dx.doi.org/10.5141/JEFB.2008.31.1.075

Life History Traits and the Rate of Molecular Evolution in Galliformes (Aves)  

Eo, Soo-Hyung (Warnell School of Forestry and Natural Resources, University of Georgia)
Publication Information
Journal of Ecology and Environment / v.31, no.1, 2008 , pp. 75-81 More about this Journal
Abstract
Rates of molecular evolution are known to vary widely among taxonomic groups. A number of studies, examining various taxonomic groups, have indicated that body size is negatively and clutch size is positively correlated with the rates of nucleotide substitutions among vertebrate species. Generally, either smaller body mass or larger clutch size is associated with shorter generation times and higher metabolic rates. However, this generality is subject to ongoing debate, and large-scale comparative studies of species below the Order level are lacking. In this study, phylogenetically independent methods were used to test for relationships between rates of the mitochondrial cytochrome b evolution and a range of life history traits, such as body mass and clutch size in the Order Galliformes. This analysis included data from 67 species of Galliformes birds and 2 outgroup species in Anseriformes. In contrast to previous studies, taxa were limited to within-Order level, not to Class or higher. I found no evidence to support an effect of life history traits on the rate of molecular evolution within the Galliformes. These results suggest that such relationship may be too weak to be observed in comparisons of closely related species or may not be a general pattern that is applicable to all nucleotide sequences or all taxonomic groups.
Keywords
Galliformes; Life history; Molecular evolution; Phylogenetic comparative method;
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