A total of 95 nucleotide sequences of a Co-1 gene fragment of approximately 650 bp were analyzed for fishes of the orders Perciformes and Scorpaeniformes (outgroup). Gene trees based on four algorithms (BA, NJ, MP, and ML) were similar in topology of solved branches. An emphasis was placed on the species and generic levels, but a significant phylogenetic signal was obtained for higher taxonomic ranks as well. For instance, a monophyletic origin was confirmed for the family Zoarcidae and the subfamily Opisthocentrinae (Stichaeidae). The proportion of different nucleotides in the sequences compared (p-distances) significantly increased with increasing taxonomic rank. The p-distances were estimated for four hierarchic levels and were (1) 0.15 ± 0.06% for the within-species hierarchic level, (2) 6.33 ± 0.37% for the within-genus level, (3) 11.83 ± 0.06% for the within-family level, and (4) 15.22 ± 0.05% for the within-order level. The difference in the Co-1 gene fragments between levels (1) and (2) allows almost errorless species identification on the basis of this kind of a molecular bar code.
Russian Journal of Genetics – Springer Journals
Published: Feb 20, 2012
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