Genetically isolated population of the coastal species with high dispersal potential: the case of the sentinel crab <i>Macrophthalmus japonicus</i> (Brachyura: Macrophthalmidae) in Japan

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  • Kobayashi Genki
    Seto Marine Biological Laboratory, Field Science Education and Research Center, Kyoto University
  • Itoh Hajime
    National Institute for Environmental Studies, 16–2 Onogawa
  • Kanaya Gen
    National Institute for Environmental Studies, 16–2 Onogawa
  • Abe Hirokazu
    Center for Liberal Arts and Sciences, Iwate Medical University
  • Kojima Shigeaki
    Atomosphere and Ocean Research Institute, The University of Tokyo

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  • Genetically isolated population of the coastal species with high dispersal potential : the case of the sentinel crab Macrophthalmus japonicus (Brachyura: Macrophthalmidae) in Japan

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Abstract

<p>Genetic homogeneity among populations of marine organisms with high dispersal potential is maintained by high gene flow whereas genetic differentiation is often formed under the presence of dispersal barriers. One of the possible dispersal barriers for intertidal species in Japan is the Sea of Japan because several tidal-flat species are absent in the region due to the small tidal range. In this study, we aimed to validate this possibility by examining the population genetic structure of the intertidal crab Macrophthalmus japonicus, which possesses a long planktonic larval period indicating high dispersal potential but is absent on the Sea of Japan side in Honshu Island. In total, 83 haplotypes of the mitochondrial cytochrome c oxidase subunit I were recovered from 154 specimens collected from 10 Japanese sampling sites and three GenBank sequences from China and Korea. All populations showed high genetic diversity except for the northernmost population at Asadokoro site in Mutsu Bay. The ΦST values among populations were low, even between populations with great distances such as the Pacific side of northeastern Honshu and Kyushu Islands (ca. 1500 km). On the other hand, the ΦST values between Asadokoro site and the other Japan sites were high. The isolation of the northernmost population despite the high dispersal potential of M. japonicus is probably because of the absence of neighboring populations that can supply larvae to the northernmost population and the invasion of larvae from the Pacific side is blocked by ocean currents.</p>

Journal

  • Plankton and Benthos Research

    Plankton and Benthos Research 18 (1), 13-20, 2023-02-28

    The Plankton Society of Japan, The Japanese Association of Benthology

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