globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-014-9996-8
Scopus记录号: 2-s2.0-84904811894
论文题名:
Microbial controls on DMSP degradation and DMS formation in the Sargasso Sea
作者: Vila-Costa M.; Rinta-Kanto J.M.; Poretsky R.S.; Sun S.; Kiene R.P.; Moran M.A.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 120, 期:2018-01-03
起始页码: 295
结束页码: 305
语种: 英语
英文关键词: Bacterioplankton ; Dimethylsulfide ; Dimethylsulfoniopropionate ; DMS ; DMSP ; Sargasso sea
Scopus关键词: Bacteria (microorganisms)
英文摘要: Bacterial degradation of dimethylsulfoniopropionate (DMSP) represents one of the main sources of the climatically-active trace gas dimethylsulfide (DMS) in the upper ocean. Short-term enrichment studies to stimulate specific pathways of DMSP degradation in oligotrophic waters from the Sargasso Sea were used to explore regulatory connections between the different bacterial DMSP degradation steps and determine potential biological controls on DMS formation in the open ocean. Experiments were conducted with surface water at the BATS station in the western North Atlantic Ocean. We added selected organic substrates (25 nmol L-1 final concentration) to induce different steps of DMSP degradation in the microbial community, and then measured DMSP dynamics (assimilation and turnover rates), DMS yields (using 35sulfur-DMSP tracer), and bacterial production rates. In most treatments, the main fate of consumed S-DMSP was excretion as a non-volatile S product. 35S-DMSP tracer turnover rates (accumulation + assimilation + excretion of transformed products as DMS or others) increased upon addition of DMSP and glucose, but not acrylate, methymercaptopropionate (MMPA), methanethiol, DMS or glycine betaine. DMS yields from 35S-DMSP never exceeded 16 % except in a short term DMSP enrichment, for which the yield reached 45 % (±17 %). Results show that availability of non-sulfur containing labile C sources (glucose, acrylate) decreased bacterial DMS production while stimulating bacterial heterotrophic production, and suggest an influence of bacterial sulfur demand in controlling DMS-yielding pathways. However, regulatory effects on 35S-DMSP fate were not consistent across all reduced sulfur compounds (i.e., methanethiol or MMPA), and may reflect alternate roles of DMSP as a bacterial energy source and osmolyte. © 2014 Springer International Publishing Switzerland.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83698
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: Department of Marine Sciences, University of Georgia, Athens, GA, 30602-3636, United States; Limnological Observatory of the Pyrenees (LOOP) - Department of Ecology, University of Barcelona, Av. Diagonal 643, 08028 Barcelona, Spain; Department of Environmental Chemistry, IDAEA-CSIC, Barcelona, Catalonia, Spain; Department of Marine Sciences, University of South Alabama, Mobile, AL, 36688, United States; Division of Microbiology, Department of Food and Environmental Sciences, University of Helsinki, 00014 Helsinki, Finland; Department of Biological Sciences, University of Illinois at Chicago, Chicago, IL, 60607, United States; Center for Research in Biological Systems, University of California San Diego, 9500 Gilman Drive #0446, La Jolla, CA, 92093-0446, United States

Recommended Citation:
Vila-Costa M.,Rinta-Kanto J.M.,Poretsky R.S.,et al. Microbial controls on DMSP degradation and DMS formation in the Sargasso Sea[J]. Biogeochemistry,2014-01-01,120(2018-01-03)
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