Journal
MITOCHONDRIAL DNA PART A
Volume 27, Issue 3, Pages 2225-2240Publisher
TAYLOR & FRANCIS LTD
DOI: 10.3109/19401736.2014.984164
Keywords
Co-1; Cyt-b; molecular phylogeny; nucleotide composition; sequence divergence; p-distance; scorpionfish; taxonomy
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Funding
- Far Eastern Branch of Russian Academy of Science [12-I-OBN-07, 12-II-CO-06-017, KPFI 12-06-002]
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The average scores of p-distances at Co-1 and Cyt-b genes revealed a pattern of increased nucleotide diversity for four categories: (1) intraspecies, (2) intragenus, (3) intrafamily, and (4) intraorder. Scores for Co-1 genes were following: (1) 0.24 +/- 0.19% (n = 66), (2) 1.54 +/- 0.27% (n = 33), (3) 11.57 +/- 0.24% (n = 42), and (4) 12.91 +/- 0.16% (n = 102); while for Cyt-b genes, those values were (1) 1.92 +/- 0.55% (n = 24), (2) 8.19 +/- 0.09% (n = 812), (3) 15.42 +/- 0.07% (n = 1573), and (4) 23.13 +/- 0.19% (n = 211). A concordant increase in the distance score, as the rank of taxa grows, with the minimum at intraspecies level substantiates the concept that speciation in the order Scorpaeniformes mostly follows a geographic mode. Phylogenetic trees for 40 sequences of scorpionfish and four other fishes belonging to Actinopterigii were developed using Co-1 gene and four different analytical approaches: Bayesian, ML, MP, and NJ. Resolution of the Co-1 trees for the three genera that included different species branches was quite distinct in all approaches. Intrafamily branching for Cyt-b in Cottidae was also supported by all four kinds of trees but only for less numerous genera in the research.
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