摘要
To further understand the effect of Kuroshio intrusion on phytoplankton community structure in the northeastern South China Sea(NSCS,14°–23°N,114°–124°E),one targeted cruise was carried out from July to August,2017.A total of 79 genera and 287 species were identified,mainly including Bacillariophyta(129 species),Pyrrophyta(150 species),Cyanophyta(4 species),Chrysophyta(3 species)and Haptophyta(1 species).The average abundance of phytoplankton was 2.14×10~3 cells/L,and Cyanobacterium was dominant species accounting for 86.84%of total phytoplankton abundance.The abundance and distribution of dominant Cyanobacterium were obviously various along the flow of the Kuroshio,indicating the Cyanobacterium was profoundly influenced by the physical process of the Kuroshio.Therefore,Cyanobacterium could be used to indicate the influence of Kuroshio intrusion.In addition,the key controlling factors of the phytoplankton community were nitrogen,silicate,phosphate and temperature,according to Canonical Correspondence Analysis.However,the variability of these chemical parameters in the study water was similarly induced by the physical process of circulations.Based on the cluster analysis,the similarity of phytoplankton community is surprisingly divided by the regional influence of the Kuroshio intrusion,which indicated Kuroshio intrusion regulates phytoplankton community in the NSCS.
基金
The National Natural Science Foundation of China under contract Nos 41876134,41676112 and 41276124
the Key Project of Natural Science Foundation for Tianjin under contract No.17JCZDJC40000
the University Innovation Team Training Program for Tianjin under contract No.TD12-5003
the Tianjin 131 Innovation Team Program under contract No.20180314
the Changjiang Scholar Program of Chinese Ministry of Education under contract No.T2014253 to Jun Sun
We thank the Open Cruise Project in northeastern South China Sea of National Nature Science Foundation of China(NORC2017-07)for sharing their ship time.We also thank our colleagues Jianyu Hu from Xiamen University who provided the temperature and salinity data,and Weifang Chen from Xiamen University for her assistance on cruise coordination.
