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Copepod Biodiversity in Japan: Recent Advances in Japanese Copepodology

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Species Diversity of Animals in Japan

Part of the book series: Diversity and Commonality in Animals ((DCA))

Abstract

Recent advances in our understanding of the biodiversity of copepods in Japanese waters are briefly reviewed. It is noteworthy that the two new species of Platycopioida found in Japan are the first record of this order from the Indo-Pacific. Taxonomic revisions of calanoids in Japanese waters have continued based on both morphological and molecular data. Molecular analyses have revealed the presence of cryptic/sibling species in a common species and of intraspecific variations. Complete mitochondrial DNA sequences from copepods have been analyzed for Tigriopus japonicus, which suggest that copepods are genetically ‘eccentric.’ Molecular tools have helped to clarify the phylogenetic relationships of highly modified symbiotic copepods. Population dynamics, life cycles, and distributions of planktonic copepods have been thoroughly investigated in coastal and oceanic waters. These studies highlighted the influence of the Oyashio/Kuroshio currents on the coast, the high mortality of eggs from predation, adaptive responses to phytoplankton blooms, and niche partitioning by habitat and food. Deep-sea calanoids are highly diverse and specialized for detritivory and carnivory. East Asian planktonic copepods have been introduced to America and Europe via ballast water, although Japan not yet received any alien planktonic copepods. In contrast, parasitic copepods have been introduced to Japan via aquaculture. The life cycle of commercially important sea lice was clarified. Because copepods are one of the most abundant metazoans on Earth, more biological but also biomimetic information should be accumulated.

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Acknowledgments

We express our sincere thanks to Profs. Geoffrey A. Boxshall and Ephrime Metillo and an anonymous reviewer for their critical comments on the early draft. Thanks are due to Prof. Hiroshi Ueda for his comments on the distributions of planktonic copepods. This study was partially supported by grants-in-aid (Nos. 25304031, 26304040, 16K07825) and the Asian-CORE and Core-to-Core Programs, all from the Japan Society for the Promotion of Science.

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  1. Takehara Marine Science Station, Setouchi Field Science Center, Graduate School of Biosphere Science, Hiroshima University, 5-8-1 Minato-machi, Takehara, Hiroshima, 725-0024, Japan

    Susumu Ohtsuka

  2. Atomosphere and Ocean Research Institute, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8564, Japan

    Shuhei Nishida

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  1. Susumu Ohtsuka
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  2. Shuhei Nishida
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Correspondence to Susumu Ohtsuka .

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  1. The Kyoto University Museum, Kyoto University, Sakyo-ku, Kyoto, Japan

    Masaharu Motokawa

  2. Faculty of Science, Hokkaido University, Sapporo, Hokkaido, Japan

    Hiroshi Kajihara

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Ohtsuka, S., Nishida, S. (2017). Copepod Biodiversity in Japan: Recent Advances in Japanese Copepodology. In: Motokawa, M., Kajihara, H. (eds) Species Diversity of Animals in Japan. Diversity and Commonality in Animals. Springer, Tokyo. https://doi.org/10.1007/978-4-431-56432-4_22

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