AB 19:297-305 (2013)  -  DOI: https://doi.org/10.3354/ab00539

Shell morphology and genetic characteristics of Corbula (Potamocorbula) spp. (Bivalvia: Corbulidae) from the waters adjacent to Japan, Korea and San Francisco Bay

Masato Owada1,*, Yoshitaro Kasai2, Shin’ichi Sato3, Jae-Sang Hong4

1Department of Biological Sciences, Kanagawa University, 2946 Tsuchiya, Hiratsuka 259-1293, Japan
2Department of Earth Sciences, Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
3The Tohoku University Museum, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
4Department of Oceanography, Inha University, Incheon 402-751, South Korea

ABSTRACT: Corbula (Potamocorbula) spp. are natively distributed in the waters adjacent to Japan and Korea. These populations are distinguished by 6 morphological characteristics. However, they have high geographic variation, and it is quite difficult to distinguish among them. In the present study, we investigated the geographic distribution of the morphological and genetic characteristics of Corbula (Potamocorbula) spp. collected from the waters adjacent to Japan, Korea and San Francisco Bay, USA. Shell morphology was inferred through canonical discriminant analysis (CDA) of 8 shell characteristics, and genetic characteristics were analysed using the DNA sequences of mitochondrial cytochrome c oxidase subunit 1 (CO1) and nuclear internal transcribed spacer 2 (ITS2) regions. The results of CDA showed that the samples from Ganghwa-do in western Korea could be clearly separated from those of all the other localities. The molecular phylogenetic tree and haplotype network that were constructed from the CO1 and ITS2 regions, respectively, did not show clear groupings among the collected samples, except for 1 group composed of samples from Ganghwa-do. In addition, no differences in CO1 amino acid sequences could be found among any of the samples examined, including the Ganghwa-do samples. These facts suggest that Corbula (Potamocorbula) spp. distributed in the waters adjacent to Japan and Korea were separated into 2 groups. However, these 2 groups were genetically closely related, and it seems appropriate to treat them as 2 distinct species. The classification of the subgenus Potamocorbula should be re-examined at the species level.


KEY WORDS: Mollusca · Bivalvia · Corbulidae · Potamocorbula · Phylogeography · Classification · Mitochondrial cytochrome c oxidase subunit 1 · Nuclear internal transcribed spacer 2


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Cite this article as: Owada M, Kasai Y, Sato S, Hong JS (2013) Shell morphology and genetic characteristics of Corbula (Potamocorbula) spp. (Bivalvia: Corbulidae) from the waters adjacent to Japan, Korea and San Francisco Bay. Aquat Biol 19:297-305. https://doi.org/10.3354/ab00539

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