Abstract
The systematics of the species-rich genus of Sebastes rockfish has not been resolved, and is unlikely to be resolved using morphological criteria. Using an alternative approach based on DNA sequence variation, we sampled the genome for random, presumably neutral, nuclear DNA sequences, by sequencing microsatellite flanking regions of 15 Sebastes species (representing 15 of 22 extant subgenera) and Hozukius emblemarius. We aligned sequences of flanking regions of eight of the 13 loci that amplified, which presumably are homologous. In aggregate, the aligned sequences included 848 bp, 53 bp of which were polymorphic. The base changes among species included 27 transitions, 20 transversions, three multiple substitutions, and three deletions or insertions. The flanking regions at different loci had different base substitution rates. Nucleotide divergence among Sebastes species ranged from 0.0012 to 0.0216, whereas nucleotide divergence between Sebastes and Hozukius species ranged from 0.0095 to 0.0240. We used maximum parsimony, neighbor-joining, and maximum likelihood methods to examine relationships among the species. H. emblemariusformed a separate group, and five of the western Pacific Ocean species of rockfish clustered together, suggesting that they may have shared an evolutionary history distinct from many North American species. The flanking regions of some microsatellite loci contain DNA sequence variation that distinguishes rockfish species and may prove useful for clarifying relationships among rockfish, or other closely related species.
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Asahida, T., Gray, A.K. & Gharrett, A.J. Use of Microsatellite Locus Flanking Regions for Phylogenetic Analysis? A Preliminary Study of Sebastes subgenera. Environmental Biology of Fishes 69, 461–470 (2004). https://doi.org/10.1023/B:EBFI.0000022884.30278.32
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DOI: https://doi.org/10.1023/B:EBFI.0000022884.30278.32