气候变化领域集成服务门户(CCPortal): Significance of Acetate as a Microbial Carbon and Energy Source in the Water Column of Gulf of Mexico: Implications for Marine Carbon Cycling

CCPortal

DOI	10.1029/2018GB006129
	Significance of Acetate as a Microbial Carbon and Energy Source in the Water Column of Gulf of Mexico: Implications for Marine Carbon Cycling
	Zhuang G.-C.; Peña-Montenegro T.D.; Montgomery A.; Montoya J.P.; Joye S.B.
发表日期	2019
ISSN	0886-6236
EISSN	1944-9224
起始页码	223
结束页码	235
卷号	33 期号:2
英文摘要	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.
英文关键词	acetate metabolism; carbon cycling; carbon source; energy source; Gulf of Mexico; water column
语种	英语
scopus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)
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129744
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
推荐引用方式 GB/T 7714	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],2019,33(2).
APA	Zhuang G.-C.,Peña-Montenegro T.D.,Montgomery A.,Montoya J.P.,&Joye S.B..(2019).Significance of Acetate as a Microbial Carbon and Energy Source in the Water Column of Gulf of Mexico: Implications for Marine Carbon Cycling.Global Biogeochemical Cycles,33(2).
MLA	Zhuang G.-C.,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".Global Biogeochemical Cycles 33.2(2019).