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Phytoplankton growth and microzooplankton grazing in the central and northern South China Sea in the spring intermonsoon season of 2017

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Acta Oceanologica Sinica 2020年第6期39卷 84-95页

作者： Dawei Chen Congcong Guo Linhui Yu Yuanzhen Lu Jun Sun Tianjin Key Laboratory of Marine Resources and Chemistry Tianjin University of Science and TechnologyTianjin 300457China Research Centre for Indian Ocean Ecosystem Tianjin University of Science and TechnologyTianjin 300457China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China

Phytoplankton growth rates and mortality rates were experimentally examined at 21 stations during the 2017 spring intermonsoon(April to early May)in the northern and central South China Sea(SCS)using the dilution technique,with emphasis on a comparison between the northern and central SCS areas which had different environmental *** had been higher temperature but lower nutrients and chlorophyll a concentrations in the central SCS than those in the northern *** mean rates of phytoplankton growth(μ0)and microzooplankton grazing(m)were(0.88±0.33)d–1 and(0.55±0.22)d–1 in the central SCS,and both higher than those in the northern SCS with the values ofμ0((0.81±0.16)d–1)and m((0.30±0.09)d–1),*** growth and microzooplankton grazing rates were significantly coupled in both *** microzooplankton grazing impact(m/μ0)on phytoplankton was also higher in the central SCS(0.63±0.12)than that in the northern SCS(0.37±0.06).The microzooplankton abundance was significantly correlated with temperature in the *** might more effectively promote the microzooplankton grazing rate than phytoplankton growth rate,which might contribute to higher m and m/μ0 in the central *** with temperature,nutrients mainly affected the growth rate of *** the nutrient enrichment treatment,the phytoplankton growth rate(μn)was higher thanμ0 in the central SCS,suggesting phytoplankton growth in the central SCS was nutrient *** ratio ofμ0/μn was significantly correlated with nutrients concentrations in the both areas,indicating the limitation of nutrients was related to the concentrations of background nutrients in the study stations.

关键词： dilution technique phytoplankton growth microzooplankton grazing South China Sea spring intermonsoon season

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