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General Session 3: Biological oceanography & global change |
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The response of phytoplankton community to the water-sediment regulation event in the adjacent sea of the Yellow River Estuary
GS3-51-S
Huihui Sun* , Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences
Dongyan Liu, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences
Yuejue Wang, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences
Yueqi Wang, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences
Presenter Email: hhsun1017@163.com
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| Data of phytoplankton community and water properties were collected during April-September of 2013 in the Yellow River estuary adjacent sea, with a purpose of understanding the impact of water-sediment regulation event (WSRE) on the succession of phytoplankton assemblages. The result showed that phytoplankton assemblage shifted from the dominance of diatom to Cyanophyceae and Chlorophyceae after manually input of freshwater, and then shifted back to the dominance of diatom after two-month stop of WSRE. The statistical analysis between phytoplankton assemblages and physical-chemical variables indicated that the variations of salinity and nutrients caused by WRSE were key factors affecting the shift of phytoplankton communities. During WRSE, dissolved inorganic nitrogen and silicate in the Laizhou Bay greatly increased and salinity decreased significantly. In contrast, dissolved inorganic phosphate did not show a significant increase. Therefore, silicate limitation was relieved during summer because of WSRE, but phosphate limitation existed for the phytoplankton growth. |
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