Abstract
Nucleotide sequences from the mitochondrial cytochrome b gene were used to address a controversial suggestion that New World vultures are related more closely to storks than to Old World vultures. Phylogenetic analyses of 1-kb sequences from 18 relevant avian species indicate that the similarities in morphology and behavior between New World and Old World vultures probably manifest convergent adaptations associated with carrion-feeding, rather than propinquity of descent. Direct sequence evidence for a close phylogenetic alliance between at least some New World vultures and storks lends support to conclusions reached previously from DNA.DNA hybridization methods and detailed morphology-based appraisals, and it illustrates how mistaken assumptions of homology for organismal adaptations can compromise biological classifications. However, there was a lack of significant resolution for most other branches in the cytochrome b phylogenetic reconstructions. This irresolution is most likely attributable to a close temporal clustering of nodes, rather than to ceiling effects (mutational saturation) producing an inappropriate window of resolution for the cytochrome b sequences.
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- Desjardins P., Morais R. Nucleotide sequence and evolution of coding and noncoding regions of a quail mitochondrial genome. J Mol Evol. 1991 Feb;32(2):153–161. doi: 10.1007/BF02515387. [DOI] [PubMed] [Google Scholar]
- Kimura M. A simple method for estimating evolutionary rates of base substitutions through comparative studies of nucleotide sequences. J Mol Evol. 1980 Dec;16(2):111–120. doi: 10.1007/BF01731581. [DOI] [PubMed] [Google Scholar]
- Kornegay J. R., Kocher T. D., Williams L. A., Wilson A. C. Pathways of lysozyme evolution inferred from the sequences of cytochrome b in birds. J Mol Evol. 1993 Oct;37(4):367–379. doi: 10.1007/BF00178867. [DOI] [PubMed] [Google Scholar]
- Pamilo P., Nei M. Relationships between gene trees and species trees. Mol Biol Evol. 1988 Sep;5(5):568–583. doi: 10.1093/oxfordjournals.molbev.a040517. [DOI] [PubMed] [Google Scholar]
- Saitou N., Nei M. The neighbor-joining method: a new method for reconstructing phylogenetic trees. Mol Biol Evol. 1987 Jul;4(4):406–425. doi: 10.1093/oxfordjournals.molbev.a040454. [DOI] [PubMed] [Google Scholar]
- Tajima F. Evolutionary relationship of DNA sequences in finite populations. Genetics. 1983 Oct;105(2):437–460. doi: 10.1093/genetics/105.2.437. [DOI] [PMC free article] [PubMed] [Google Scholar]