論文

査読有り 筆頭著者 責任著者
2021年1月7日

Characterization of diversity and community structure of small planktonic copepods in the Kuroshio region off Japan using a metabarcoding approach

Marine Ecology Progress Series
  • J Hirai
  • ,
  • K Yamazaki
  • ,
  • K Hidaka
  • ,
  • S Nagai
  • ,
  • Y Shimizu
  • ,
  • T Ichikawa

657
開始ページ
25
終了ページ
41
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.3354/meps13539
出版者・発行元
Inter-Research Science Center

Small copepods are important prey for fish larvae in the Kuroshio region off southern Japan. However, revealing entire community structures of small copepods is difficult using conventional methods. We applied a metabarcoding method to size-fractionated community samples of epipelagic copepods (small: 0.1-0.5 mm, medium: 0.5-1.0 mm, and large: 1.0-2.0 mm). Samples were collected from 2013 to 2016 from the shoreward (Kuroshio Slope, KS) and oceanic (Kuroshio Gyre, KG) sides of the Kuroshio Current at 138° E; the results were compared with those in the center of the subtropical gyre (SG). The KS and KG sites showed both spatial differences and seasonal changes, with distinct differences between winter-spring and summer-autumn in each size-fractionated community. Water temperature markedly influenced copepod diversity and community structure, especially in the small size fraction. Warm-water species in the SG intruded into the Kuroshio regions during high-temperature periods, leading to high diversity in summer-autumn. Inter-annual environmental variations influenced by temperature and productivity were evident in KS, leading to clear changes in the sequence proportions of dominant small copepods including <italic>Paracalanus</italic> sp. and immature stages of the large copepod <italic>Calanus sinicus</italic>. Immature stages of medium/large copepods formed a substantial proportion of small-copepod communities in the Kuroshio regions (KS: 28.8%; KG: 24.7%; SG: 11.9%; based on average proportions of sequence reads). Because of their ecological importance and sensitivity to environmental changes, monitoring communities of small copepods with high taxonomic resolution may provide further insights into marine ecosystems, including fish recruitment, in the Kuroshio region.

リンク情報
DOI
https://doi.org/10.3354/meps13539
URL
https://www.int-res.com/articles/meps2020/657/m657p025.pdf
ID情報
  • DOI : 10.3354/meps13539
  • ISSN : 0171-8630
  • eISSN : 1616-1599

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