DOI: 10.1029/2018GB006129
论文题名: Significance of Acetate as a Microbial Carbon and Energy Source in the Water Column of Gulf of Mexico: Implications for Marine Carbon Cycling
作者: Zhuang G.-C. ; Peña-Montenegro T.D. ; Montgomery A. ; Montoya J.P. ; Joye S.B.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2019
卷: 33, 期: 2 语种: 英语
英文关键词: acetate (salt)
; bacterium
; biomineralization
; carbon cycle
; dissolved organic carbon
; energy resource
; environmental factor
; marine environment
; metabolism
; organic matter
; oxidation
; particulate organic carbon
; water column
; Atlantic Ocean
; Gulf of Mexico
; Alphaproteobacteria
; Bacteria (microorganisms)
学科: acetate metabolism
; carbon cycling
; carbon source
; energy source
; Gulf of Mexico
; water column
中文摘要: Acetate is a key intermediate of organic matter mineralization, but its metabolism remains largely unconstrained in the pelagic ocean. We conducted an integrated biogeochemical study to investigate microbial acetate cycling in the northern Gulf of Mexico with the goal of elucidating the importance of acetate as a carbon and energy source. Acetate was used primarily as an energy source, as evidenced by observed oxidation rates (rate constant k: 0.06–0.22 day−1) that varied between 42% and 96% of total biological acetate uptake (i.e., assimilation + oxidation; k: 0.06–0.34 day−1). The assimilation of acetate into biomass (k: 0.01–0.20 day−1) illustrated the potential significance of acetate as a biomass carbon source, particularly in nutrient-rich coastal waters. No relationship between acetate assimilation or oxidation and environmental factors, such as chlorophyll and nutrients, was observed. However, elevated acetate uptake in reduced oxygen waters characterized by particulate organic carbon mineralization suggests that acetate metabolism may be a good proxy for particulate organic carbon breakdown. Molecular genetic analysis revealed that SAR11 Alphaproteobacteria were the most abundant heterotrophic bacteria and suggest that they may utilize acetate. At some sites, acetate carbon may have accounted for up to 50.4% of the bacterial carbon production. These results suggest that acetate may serve as an important carbon and energy source for heterotrophic bacteria thus revealing a potentially significant role of acetate for dissolved organic carbon cycling in the ocean. ©2019. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160148
Appears in Collections: 气候变化与战略
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作者单位: Department of Marine Sciences, University of Georgia, Athens, GA, United States; Institute of Bioinformatics, University of Georgia, Athens, GA, United States; School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, United States
Recommended Citation:
Zhuang G.-C.,Peña-Montenegro T.D.,Montgomery A.,et al. Significance of Acetate as a Microbial Carbon and Energy Source in the Water Column of Gulf of Mexico: Implications for Marine Carbon Cycling[J]. Global Biogeochemical Cycles,2019-01-01,33(2)