Changes in Plankton Community Structure, Standing Stocks and Productivity from Upstream to Downstream of the Kuroshio Across the Tokara Strait

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  • トカラ海峡上流域から下流域におけるプランクトン群集組成， 現存量および生産力の変化
  • トカラ カイキョウ ジョウリュウイキ カラ カリュウイキ ニ オケル プランクトン グンシュウ ソセイ,ゲンソンリョウ オヨビ セイサンリョク ノ ヘンカ

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Plankton community structure, standing stocks and productivity were compared between upstream and downstream of the Tokara Strait based on Lagrangian oceanographic observations and sampling along the Kuroshio. Surface waters above 200m were represented by lower temperature and salinity, and nutrients and chlorophyll a concentrations at the subsurface were higher downstream than upstream. No significant difference was found in the zooplankton community structure, and the predominant components were naked ciliates for microzooplankton and copepods for net zooplankton. Although the protein synthetase activity of the net zooplankton community was high throughout the stations, large metazoans were one cause of the increased biomass and production rates downstream. These results suggest that the nutrient supply and phytoplankton increased at the subsurface, and the net zooplankton biomass and productivity increased downstream of the Tokara Strait.

Journal

  • Bulletin on Coastal Oceanography

    Bulletin on Coastal Oceanography 57 (1), 65-72, 2019

    Coastal Oceanography Research Committee, the Oceanographic Society of Japan

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