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Ichthyological Research

, Volume 67, Issue 1, pp 212–220 | Cite as

Geographical distribution and population genetic structure of the gobiid fish Gymnogobius sp. 2, formerly known as Gymnogobius cf. castaneus “Toyama-endemic”

  • Shunsuke Chiba
  • Takanori Kawasaki
  • Kunihiko Yamamoto
  • Satoru N. Chiba
  • Kouichi Shibukawa
  • Takahiko Mukai
  • Tomoyuki KokitaEmail author
Short Report

Abstract

The geographical distribution and population genetic structure of the endangered freshwater goby Gymnogobius sp. 2 sensu Akihito et al. (2013) (formerly known as Gymnogobius cf. castaneus “Toyama-endemic”) were investigated via extensive field surveys in the Hokuriku District, on the Sea of Japan side of central Honshu, Japan. This species was widely distributed over the western Hokuriku region, including the Toyama Plain, Noto Peninsula/Kaga Plain (Ishikawa Prefecture), and Fukui Plain. Analyses of mitochondrial DNA and nuclear DNA indicated that the Ishikawa and Fukui populations of Gymnogobius sp. 2, which formed a monophyletic group, were clearly divergent from other species of the G. castaneus species complex. In addition, there was a clear genetic divergence between these populations. However, the complete mtDNA replacement has occurred in the Toyama populations of Gymnogobius sp. 2, almost certainly via historical introgressive hybridization with the G. castaneus–taranetzi complex. Thus, this species forms at least three isolated lineages with unique and divergent evolutionary histories.

Keywords

Endangered species Population divergence Introgressive hybridization Evolutionarily significant units 

Notes

Acknowledgements

We thank G. Kondo, M. Nishio, and T. Oka for helping with specimen collection. We are grateful to the two anonymous reviewers for valuable comments on the manuscript. The authors declare that they have no conflicts of interest.

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Copyright information

© The Ichthyological Society of Japan 2019

Authors and Affiliations

  • Shunsuke Chiba
    • 1
  • Takanori Kawasaki
    • 2
  • Kunihiko Yamamoto
    • 3
  • Satoru N. Chiba
    • 4
  • Kouichi Shibukawa
    • 4
  • Takahiko Mukai
    • 5
  • Tomoyuki Kokita
    • 1
    Email author
  1. 1.Faculty of Marine Science and TechnologyFukui Prefectural UniversityObamaJapan
  2. 2.AwaraJapan
  3. 3.Ishikawa ZooNoumiJapan
  4. 4.Museum of Natural and Environmental HistoryShizuokaJapan
  5. 5.Faculty of Regional StudiesGifu UniversityGifuJapan

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