The coastal ecosystems are highly sensitive to climate change and are usually influenced by variations in phytoplankton communities and water physiochemical factors.In the present study,the phytoplankton community,chlorophyll a(Chl a)and their relationships with environmental variables and dimethylsulfide(DMS)and dimethylsulfoniopropionate(DMSP)were investigated in spring 2017(March 24 to April 16)in the East China Sea(26.0°-33.0°N,120.0°-128.0°E)and southern Yellow Sea(31.0°-36.0°N,120.0°-125.0°E).The spatial distributions of phytoplankton species composition and cell density were investigated by qualitative and quantitative methods and were compared with historical data to study phytoplankton species succession in the survey area.The results showed that there were 275 phytoplankton species belonging to 90 genera and 6 phyla in the survey area,of which 208 species belonged to 62 genera of Bacillariophyta and 56 species belonged to 20 genera of Pyrrophyta.The dominant phytoplankton species were Skeletonema dohrnii,Chaetoceros vanheurckii and Prorocentrum donghaiense.The phytoplankton cell densities ranged from 0.06x104 cells/L to 418.73×104 cells/L,with an average value of 21.46×104 cells/L.In spring,the average ratio of Bacillariophyta/Pyrrophyta was 41.13 for the entire study area.The areas with high phytoplankton cell density were mainly distributed in the northern South Yellow Sea and offshore waters of the East China Sea.According to a canonical correspondence analysis among phytoplankton and environmental parameters,the water Chi a concentrations were notably consistent with phytoplankton cell density(P＜0.001),and both showed significant negative correlations with salinity and nitrite(P＜0.05)and significant positive correlations with dissolved oxygen and pH(P＜0.001).There was a significant positive correlation between diatom(both in cell density and in dominant species)and DMS(P＜0.05),which indicated that diatoms play a greater role in DMS production in this investigated area.

Jiawei Zhang;Yanghang Chen;Xueyan Ren;Vishal Patil;Lin Sun;Xuesong Li;Junrong Liang;Jun Zhang;Yahui Gao;Changping Chen

School of Life Sciences,Xiamen University,Xiamen 361102,China;Key Laboratory of the Coastal and Wetland Ecosystems of Ministry of Education,Xiamen University,Xiamen 361102,China;Eco-Environmental Monitoring and Research Center,Pearl River Valley and South China Sea Ecology and Environment Administration,Ministry of Ecology and Environment,Guangzhou 510610,China;Laboratory of Marine Biology and Ecology,Third Institute of Oceanography,State Oceanic Administration,Xiamen 361005,China;State Key Laboratory of Marine Environmental Science,Xiamen University,Xiamen 361102,China

海洋学报（英文版）

[1]Jiawei Zhang;Yanghang Chen;Xueyan Ren;Vishal Patil;Lin Sun;Xuesong Li;Junrong Liang;Jun Zhang;Yahui Gao;Changping Chen-.Distribution of phytoplankton in the East China Sea and the southern Yellow Sea in spring in relation to environmental variables and dimethylsulfide compounds)[J].海洋学报（英文版）,2022(06):41-53

dimethylsulfoniopropionate,dohrnii,vanheurckii,06x104

Distribution,phytoplankton,East,China,Sea,southern,Yellow,spring,environmental,variables,dimethylsulfide,compounds,coastal,ecosystems,highly,sensitive,climate,change,usually,influenced,by,variations,communities,physiochemical,factors,In,present,study,community,chlorophyll,Chl,their,relationships,DMSP,were,investigated,March,April,spatial,distributions,species,composition,density,qualitative,quantitative,methods,compared,historical,data,succession,survey,results,showed,that,there,belonging,genera,phyla,which,belonged,Bacillariophyta,Pyrrophyta,dominant,Skeletonema,Chaetoceros,Prorocentrum,donghaiense,densities,ranged,from,cells,average,value,was,entire,areas,mainly,distributed,northern,South,offshore,waters,According,canonical,correspondence,analysis,among,parameters,concentrations,notably,consistent,both,significant,negative,correlations,salinity,nitrite,positive,dissolved,oxygen,There,between,indicated,diatoms,play,greater,role,production,this

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