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学科主题: Science & Technology - Other Topics
题名: Response of Bacterial Metabolic Activity to Riverine Dissolved Organic Carbon and Exogenous Viruses in Estuarine and Coastal Waters: Implications for CO2 Emission
作者: Xu, J ; Sun, MM ; Shi, Z ; Harrison, PJ ; Liu, HB
通讯作者: xujie@scsio.ac.cn
刊名: PLOS ONE
发表日期: 2014
卷: 9, 期:7, 页:-e102490
收录类别: sci
部门归属: [Xu, Jie ; Shi, Zhen] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China ; [Sun, Mingming ; Harrison, Paul J. ; Liu, Hongbin] Hong Kong Univ Sci & Technol, Div Life Sci, Kowloon, Hong Kong, Peoples R China
项目归属: LTO
资助者: Hundred Talented Program Startup Fund [Y35L041001]; South China Sea Institute of Oceanology; Key Project of National Natural Science Fundation of China [91128212]; University Grants Council of Hong Kong AoE project [AoE/P-04/04-4-II]
摘要: A cross-transplant experiment between estuarine water and seawater was conducted to examine the response of bacterial metabolic activity to riverine dissolved organic carbon (DOC) input under virus-rich and virus-free conditions, as well as to exogenous viruses. Riverine DOC input increased bacterial production significantly, but not bacterial respiration (BR) because of its high lability. The bioavailable riverine DOC influenced bulk bacterial respiration in two contrasting ways; it enhanced the bulk BR by stimulating bacterial growth, but simultaneously reduced the cell-specific BR due to its high lability. As a result, there was little stimulation of the bulk BR by riverine DOC. This might be partly responsible for lower CO2 degassing fluxes in estuaries receiving high sewage-DOC that is highly labile. Viruses restricted microbial decomposition of riverine DOC dramatically by repressing the growth of metabolically active bacteria. Bacterial carbon demand in the presence of viruses only accounted for 7-12% of that in the absence of viruses. Consequently, a large fraction of riverine DOC was likely transported offshore to the shelf. In addition, marine bacteria and estuarine bacteria responded distinctly to exogenous viruses. Marine viruses were able to infect estuarine bacteria, but not as efficiently as estuarine viruses, while estuarine viruses infected marine bacteria as efficiently as marine viruses. We speculate that the rapid changes in the viral community due to freshwater input destroyed the existing bacteria-virus relationship, which would change the bacterial community composition and affect the bacterial metabolic activity and carbon cycling in this estuary.
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WOS记录号: WOS:000339615200064
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10525
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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Xu, J; Sun, MM; Shi, Z; Harrison, PJ; Liu, HB.Response of Bacterial Metabolic Activity to Riverine Dissolved Organic Carbon and Exogenous Viruses in Estuarine and Coastal Waters: Implications for CO2 Emission,PLOS ONE,2014,9(7):-e102490
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