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Demographic histories of two deep-sea eelpouts, Lycodes japonicus and Lycodes ocellatus: paleoenvironmental implications of the western North Pacific deep waters

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Abstract

We compared the population histories of two deep-sea eelpouts, Lycodes japonicus and Lycodes ocellatus, to elucidate the impacts of the last glacial period on deep-sea species in the western North Pacific area. The results of phylogenetic analyses based on the nucleotide sequences of the mitochondrial cytochrome c oxidase subunit I and cytochrome b genes revealed that the two species are closely related to each other. The results of mismatch distribution analyses, Bayesian skyline plots, and a Bayes factor test supported a constant population size of L. ocellatus in the western North Pacific during the last glacial period, but suggested a post-glacial population expansion of L. japonicus.

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Acknowledgments

We thank the captains, officers, and crews of the T/S Tanshu-Maru (Kasumi High School, Hyogo Prefecture) and the R/V Wakataka-maru (Tohoku National Fishery Institute, Fisheries Research Agency) for their help with sampling. The samples were collected on behalf of the Fishery Resources Survey contracted by the Ministry of Agriculture, Forestry, and Fisheries of Japan. This study was also supported in part by a grant from the Ministry of Education, Culture, Sports, Science, and Technology of Japan (no. 22370032).

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Correspondence to Kay Sakuma.

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Sakuma, K., Ueda, Y., Ito, M. et al. Demographic histories of two deep-sea eelpouts, Lycodes japonicus and Lycodes ocellatus: paleoenvironmental implications of the western North Pacific deep waters. Ichthyol Res 62, 363–367 (2015). https://doi.org/10.1007/s10228-014-0441-8

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  • DOI: https://doi.org/10.1007/s10228-014-0441-8

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