Abstract
In the classical taxonomy, three Scomber species are distinguished: S. scombrus, S. australasicus, and S. japonicus. Yet, some fish taxonomists have recently recognized Scomber colias, inhabiting the Atlantic Ocean, as a separate species from S. japonicus, distributed in the Pacific Ocean. Such proposal was based on significant mitochondrial DNA divergence as well as great phenotypic variation among individuals from these two ocean basins. However, in the absence of nuclear DNA data this issue remains still controversial. In this study, a phylogenetic analysis of nuclear 5S rDNA sequences was performed. A total of 30 individuals of S. colias collected in the Atlantic and 34␣specimens of S. japonicus from the Pacific were characterized. Moreover, nine individuals of Pacific S.␣australasicus and eight of Atlantic S. scombrus were included. Maximum likelihood, maximum parsimony, and neighbor-joining analyses revealed the presence of␣two well-supported distinct clades corresponding to S. colias and S. japonicus, respectively. Altogether, morphologic and genetic data are in agreement with the recognition of two different species, S. colias in the Atlantic, and S. japonicus in the Pacific.
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Acknowledgements
We are greatly appreciative to Dr. Masaya Okabe and to Dr. Tetsuya Umino for kindly providing and identifying Pacific samples of S. japonicus and S. australasicus. We also thank Dirección General de Pesca (Consejería de Agricultura y Pesca, Junta de Andalucía), Empresa Pública para el Desarrollo Agrario y Pesquero de Andalucía (Dap), and José María Naranjo Márquez for their continuous support to the laboratory. This work has been funded by IFOP (EU).
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Infante, C., Blanco, E., Zuasti, E. et al. Phylogenetic differentiation between Atlantic Scomber colias and Pacific Scomber japonicus based on nuclear DNA sequences. Genetica 130, 1–8 (2007). https://doi.org/10.1007/s10709-006-0014-5
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DOI: https://doi.org/10.1007/s10709-006-0014-5