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学科主题: Fisheries ; Limnology ; Marine & Freshwater Biology ; Oceanography
题名: Picophytoplankton abundance and distribution in three contrasting periods in the Pearl River Estuary, South China
作者: [Zhang, Xia ; Shi, Zhen ; Ye, Feng ; Zeng, Yanyi ; Huang, Xiaoping] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China
通讯作者: xphuang@scsio.ac.cn
关键词: picocyanobacteria ; picoplankton ; Prochlorococcus
刊名: MARINE AND FRESHWATER RESEARCH
发表日期: 2013
卷: 64, 期:8, 页:692-705
部门归属: LTO
资助者: We are grateful to Lei Tian and Qingxia Liu for their support in collecting samples. We thank Jianlin Zhang for flow cytometry analyses. This study was supported by National Nature Science Foundation of China (31000185, 41076069), the Key Innovation Project of Chinese Academy of Sciences (KZCXZ-YW-Q07) and the Knowledge Innovation Program of the Chinese Academy of Sciences (No. SQ201109).
摘要: Abundance and distribution characteristics of three picophytoplankton groups (Synechococcus, Prochlorococcus and picoeukaryotes), identified by flow cytometer, and two types of picocyanobacteria (phycoerythrin and phycocyanin-rich strains), determined by epifluorescence microscope, were assessed in three contrasting periods in the Pearl River Estuary, South China. The average abundance of picophytoplankon and picocyanobacteria was 10(4) cells mL(-1) in the two summer observations and 10(3) cells mL(-1) in winter. Low cell density in the cold season was probably due to high turbidity and low water temperature. Prochlorococcus was detected within the estuarine plume in the summer investigations and was undetectable in the winter. Higher abundance and the further upstream occurrence of Prochlorococcus in the summer of 2011 were mainly associated with extreme low river flows. We presumed that Prochlorococcus abundance and distribution range were balanced by river discharge and saline-water intrusion. Synechococcus was the dominant group in the inner estuary. Similar to Prochlorococcus, Synechococcus distribution was related with freshwater inflow. The river inflow exerted strong limitation on Synechococcus and Prochlorococcus, with this effect weakening along the salinity gradient. Picoeukaryotes were the least abundant category among picophytoplankton and showed a different distribution pattern from that of Synechococcus and Prochlorococcus. For picocyanobacteria, there was a clear spatial gradient with phycocyanin-rich strains dominant in the upper estuary, and phycocyanin-rich and phycoerythrin-rich cells dominant downstream. A significant negative correlation was observed between phycocyanin-rich cells to phycoerythrin-rich cells ratio and salinity.
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000322525900003
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10939
Appears in Collections:热带海洋环境国家重点实验室(LTO)_期刊论文

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[Zhang, Xia; Shi, Zhen; Ye, Feng; Zeng, Yanyi; Huang, Xiaoping] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China.Picophytoplankton abundance and distribution in three contrasting periods in the Pearl River Estuary, South China,MARINE AND FRESHWATER RESEARCH,2013,64(8):692-705
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