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Response of Bacterial Metabolic Activity to the River Discharge in the Pearl River Estuary: Implication for CO2 Degassing Fluxes
Li, Xiangfu; Xu, Jie1; Shi, Zhen; Li, Ruihuan
2019
Source PublicationFRONTIERS IN MICROBIOLOGY
ISSN1664-302X
Volume10Pages:1026
AbstractBacterial production (BP), respiration (BR) and growth efficiency (BGE) were simultaneously determined along an environmental gradient in the Pearl River Estuary (PRE) in the wet season (May 2015) and the dry season (January 2016), in order to examine bacterial responses to the riverine dissolved organic carbon (DOC) in the PRE. The Pearl River discharge delivered labile dissolved organic matters (DOM) with low DOC:DON ratio, resulting in a clear gradient in DOC concentrations and DOC:DON ratios. BP (3.93-144 mu g C L-1 d(-1)) was more variable than BR (64.6-567 mu g C L-1 d(-1) ) in terms of the percentage, along an environmental gradient in the PRE. In response to riverine DOC input, BP and the cell-specific BP increased; in contrast, the cell-specific bacterial respiration declined, likely because labile riverine DOC mitigated energetic cost for cell maintenance. Consequently, an increase in bacterial respiration was less than expected. Our findings implied that the input of highly bioavailable riverine DOC altered the carbon portioning between anabolic and catabolic pathways, consequently decreasing the fraction of DOC that bacterioplankton utilized for bacterial respiration. This might be one of the underlying mechanisms for the low CO2 degassing in the PRE receiving large amounts of sewage DOC.
DepartmentLTO
Keywordbacterial production bacterial respiration bacterial growth efficiency dissolved organic carbon the Pearl River Estuary
DOI10.3389/fmicb.2019.01026
Citation statistics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17722
Collection热带海洋环境国家重点实验室(LTO)
Affiliation1.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Coll Marine Sci, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Li, Xiangfu,Xu, Jie,Shi, Zhen,et al. Response of Bacterial Metabolic Activity to the River Discharge in the Pearl River Estuary: Implication for CO2 Degassing Fluxes[J]. FRONTIERS IN MICROBIOLOGY,2019,10:1026.
APA Li, Xiangfu,Xu, Jie,Shi, Zhen,&Li, Ruihuan.(2019).Response of Bacterial Metabolic Activity to the River Discharge in the Pearl River Estuary: Implication for CO2 Degassing Fluxes.FRONTIERS IN MICROBIOLOGY,10,1026.
MLA Li, Xiangfu,et al."Response of Bacterial Metabolic Activity to the River Discharge in the Pearl River Estuary: Implication for CO2 Degassing Fluxes".FRONTIERS IN MICROBIOLOGY 10(2019):1026.
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