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<p>This study systematically examined phytoplankton community structure and its spatial distribution across euphotic and deep-water layers in the northeastern South China Sea (ne-SCS), elucidating their responses to physical processes including eddy dynamics and Kuroshio intrusions. Our observations revealed a significant reorganization in phytoplankton community structure, with the harmful algal bloom (HAB) —forming dinoflagellate <i>Scrippsiella acuminata</i> now dominating euphotic zone assemblages, followed by <i>Nitzschia</i> spp. The pronounced shift toward HAB species dominance elevates ecological risks associated with dinoflagellate blooms, while the concurrent decline in diatom abundance may indicate reduced marine primary productivity. Phytoplankton communities displayed clear spatial segregation, characterized by cyanobacterial dominance in Kuroshio intrusion zones, preferential distribution of dinoflagellates in warm eddy regions, and diatom prevalence in cold eddy systems and deep-current environments. Phytoplankton community composition showed distinct spatial patterns, driven primarily by temperature and nutrient gradients. Deep-sea phytoplankton communities, characterized by elevated diatom-to-dinoflagellate ratios and dominance of fast-sinking species, play a significant role in organic carbon export and biogeochemical cycling processes.</p>

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Ecological responses of euphotic and deep phytoplankton to diverse controlling processes in the northeast South China Sea

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • Hongyan Guo,
  • Tongyu Bian,
  • Danyang Li,
  • Haijiao Liu,
  • Chun Zhou,
  • Jun Sun

摘要

This study systematically examined phytoplankton community structure and its spatial distribution across euphotic and deep-water layers in the northeastern South China Sea (ne-SCS), elucidating their responses to physical processes including eddy dynamics and Kuroshio intrusions. Our observations revealed a significant reorganization in phytoplankton community structure, with the harmful algal bloom (HAB) —forming dinoflagellate Scrippsiella acuminata now dominating euphotic zone assemblages, followed by Nitzschia spp. The pronounced shift toward HAB species dominance elevates ecological risks associated with dinoflagellate blooms, while the concurrent decline in diatom abundance may indicate reduced marine primary productivity. Phytoplankton communities displayed clear spatial segregation, characterized by cyanobacterial dominance in Kuroshio intrusion zones, preferential distribution of dinoflagellates in warm eddy regions, and diatom prevalence in cold eddy systems and deep-current environments. Phytoplankton community composition showed distinct spatial patterns, driven primarily by temperature and nutrient gradients. Deep-sea phytoplankton communities, characterized by elevated diatom-to-dinoflagellate ratios and dominance of fast-sinking species, play a significant role in organic carbon export and biogeochemical cycling processes.