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Population genetics and demographic history of the ice goby (Leucopsarion petersii) in the Northwest Pacific

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Abstract

The Northwest Pacific, including Korea, is an interesting area for population genetic studies because of the dramatic Pleistocene sea-level change. The ice goby Leucopsarion petersii is endemic to Korea and Japan. We hypothesized that the ice goby has a population structure. To prove this, we analyzed the phenotypic and molecular characteristics of ice gobies collected from four localities in Korea and compared them with gobies from Japan. Meristic analysis revealed no significant differences, while the morphometric characters differed according to locality and sex. Haplotype networks based on mitochondrial DNA cytb and nuclear DNA myh6 sequences showed that the four localities share the same gene pool, suggesting that there was no or very weak population structure in the South Sea of Korea in the past or at present. All of the Korean ice gobies except the Wando ice goby were similar to ice gobies from the West Sea of Japan, but significantly different from ice gobies from the Pacific Ocean. At present, the Tsushima Warm Current may facilitate ice goby dispersal from the South Sea of Korea to the West Sea of Japan, which has resulted in the same gene pool in these two populations. Dispersal of the Wando ice goby might be difficult because of the complex oceanographic conditions near Wando. A Bayesian skyline plot analysis showed that ice gobies might have experienced two demographic expansions during the Pleistocene interglacial period. Further studies based on more sensitive microsatellite DNA markers are needed to clarify the recent differentiation history.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We sincerely thank to Prof. Kai (Kyoto University, Japan) for the loan of Japanese ice goby and SW Choi and GH Park (members of Ichthyological Laboratory in Pukyong National University) who helped us collect Korean ice goby specimens. We also thank the anonymous referees for their helpful comments.

Funding

This work was supported by a Research Grant of Pukyong National University (2021).

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Contributions

The study was designed by JG Myoung and JK Kim. Field data were collected by JG Myoung and YJ Kim. All analysis was performed by YJ Kim. YJ Kim interpreted the data and written the manuscript. All authors contributed critically to the drafts and gave final approval for publication.

Corresponding author

Correspondence to Jin-Koo Kim.

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Sampling and handling were performed according to the Republic of Korea legislation. All experiments performed involving animals were in accordance with the institution’s ethical standards at which the studies were conducted. This article does not contain any studies with human participants performed by any of the authors.

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The authors declare no competing interests.

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Kim, YJ., Myoung, JG. & Kim, JK. Population genetics and demographic history of the ice goby (Leucopsarion petersii) in the Northwest Pacific. Environ Biol Fish 105, 87–103 (2022). https://doi.org/10.1007/s10641-021-01196-3

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  • DOI: https://doi.org/10.1007/s10641-021-01196-3

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