To understand the influence of Kuroshio intrusion on the phytoplankton community, a field investigation was conducted in spring 2017 in the East China Sea (ECS), and 130 seawater samples were collected and analyzed. Trichodesmium comprised the highest cell abundance contributing about 66% of the total phytoplankton followed by diatoms (17%) and dinoflagellates (16%). The dominance of the Kuroshio Waters (KW) and the Taiwan Warm Currents (TWC) were higher than the Coastal Waters (CW). The vertical distribution of physicochemical parameters depicted the intrusion of KW at the bottom layer, but it failed to reach the surface as strong upwelling was not initiated. Therefore, the dissolved inorganic phosphate (DIP) concentrations and P/N ratios were the lowest in the CW and the upper water layers, which limited the diatom growth in this area. Besides, the dinoflagellates cell abundance was also lower except in the surface and CW, though they comprised the maximum richness of species among the phytoplankton community. However, the unique characteristics such as diazotrophy and gas vacuoles of Trichodesmium made the situation advantageous, and they comprised the maximum cell abundance in this area especially in KW and the TWC. Temperature, DIP and P/N ratios appeared to be the major environmental drivers for Trichodesmium proliferation in the ECS during the study period.
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Data Availability Statement
The datasets generated and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Data and samples were collected onboard of R/V Xiangyanghong 18 implementing the open research cruise NORC2017-02 supported by NSFC Shiptime Sharing Project (project number: 41649902), We thank Mr. Gang QIAN for collecting phytoplankton water samples, and the two anonymous reviewers for their comments on improving this manuscript.
Supported by the National Key Research and Development Project of China (No. 2019YFC1407805), the National Natural Science Foundation of China (Nos. 41876134, 41676112, 41276124), the Key Project of Natural Science Foundation for Tianjin (No. 17JCZDJC40000), the University Innovation Team Training Program for Tianjin (No. TD12-5003), the Tianjin 131 Innovation Team Program (No. 20180314), and the Changjiang Scholar Program of Chinese Ministry of Education (No. T2014253) to SUN Jun
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Yue, J., Noman, M.A. & Sun, J. Kuroshio intrusion drives the Trichodesmium assemblage and shapes the phytoplankton community during spring in the East China Sea. J. Ocean. Limnol. 39, 536–549 (2021). https://doi.org/10.1007/s00343-020-9344-x
- Kuroshio waters
- community shift