Based on survey data collected in the spring and summer of 2023, this study reveals the seasonal variations in the phytoplankton community structure and its driving factors in the Pearl River Estuary. In spring, the phytoplankton community was overwhelmingly dominated by the nitrogen-fixing Cyanophyta Trichodesmium thiebautii, whereas in summer, it was jointly dominated by Bacillariophyta and Dinophyta, accompanied by a significant increase in community diversity. Redundancy analysis indicated that the spring community was primarily driven by nutrient levels, while the summer community mainly responded to changes in water temperature, reflecting the high sensitivity of subtropical estuarine ecosystems to land–sea interactions and seasonal environmental fluctuations.

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Phytoplankton Community Structure and Its Driving Factors in the Pearl River Estuary

  • Shan Yue,
  • Changling Ding,
  • Jun Sun

摘要

Based on survey data collected in the spring and summer of 2023, this study reveals the seasonal variations in the phytoplankton community structure and its driving factors in the Pearl River Estuary. In spring, the phytoplankton community was overwhelmingly dominated by the nitrogen-fixing Cyanophyta Trichodesmium thiebautii, whereas in summer, it was jointly dominated by Bacillariophyta and Dinophyta, accompanied by a significant increase in community diversity. Redundancy analysis indicated that the spring community was primarily driven by nutrient levels, while the summer community mainly responded to changes in water temperature, reflecting the high sensitivity of subtropical estuarine ecosystems to land–sea interactions and seasonal environmental fluctuations.