globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12254
Scopus记录号: 2-s2.0-85028687771
论文题名:
Carbon isotope fractionation by anoxygenic phototrophic bacteria in euxinic Lake Cadagno
作者: Posth N.R.; Bristow L.A.; Cox R.P.; Habicht K.S.; Danza F.; Tonolla M.; Frigaard N.-U.; Canfield D.E.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2017
卷: 15, 期:6
起始页码: 798
结束页码: 816
语种: 英语
Scopus关键词: bacterium ; biomarker ; biomass ; carbon dioxide ; dissolved inorganic carbon ; enzyme ; enzyme activity ; euxinic environment ; isotopic fractionation ; lipid ; sulfur cycle ; Lake Cadagno ; Switzerland ; Ticino ; Bacteria (microorganisms) ; Photobacteria
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences ; Environmental Science: General Environmental Science ; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: Anoxygenic phototrophic bacteria utilize ancient metabolic pathways to link sulfur and iron metabolism to the reduction of CO2. In meromictic Lake Cadagno, Switzerland, both purple sulfur (PSB) and green sulfur anoxygenic phototrophic bacteria (GSB) dominate the chemocline community and drive the sulfur cycle. PSB and GSB fix carbon utilizing different enzymatic pathways and these fractionate C-isotopes to different extents. Here, these differences in C-isotope fractionation are used to constrain the relative input of various anoxygenic phototrophs to the bulk community C-isotope signal in the chemocline. We sought to determine whether a distinct isotopic signature of GSB and PSB in the chemocline persists in the settling fraction and in the sediment. To answer these questions, we also sought investigated C-isotope fractionation in the water column, settling material, and sediment of Lake Cadagno, compared these values to C-isotope fractionation of isolated anoxygenic phototroph cultures, and took a mass balance approach to investigate relative contributions to the bulk fractionation signature. We found a large C-isotope fractionation between dissolved inorganic carbon (DIC) and particulate organic carbon (POC) in the Lake Cadagno chemocline. This large fractionation between the DIC and POC was also found in culture experiments carried out with anoxygenic phototrophic bacteria isolated from the lake. In the Lake Cadagno chemocline, anoxygenic phototrophic bacteria controlled the bulk C-isotope fractionation, but the influence of GSB and PSB differed with season. Furthermore, the contribution of PSB and GSB to bulk C-isotope fractionation in the chemocline could be traced in the settling fraction and in the sediment. Taken together with other studies, such as lipid biomarker analyzes and investigations of other stratified lakes, these results offer a firmer understanding of diagenetic influences on bacterial biomass. © 2017 John Wiley & Sons Ltd
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85035
Appears in Collections:影响、适应和脆弱性

Files in This Item:

There are no files associated with this item.


作者单位: Department of Biology, Nordic Centre for Earth Evolution (Nordcee), University of Southern Denmark, Odense M, Denmark; Max Planck Institute for Marine Microbiology, Bremen, Germany; Unisense A/S, Aarhus N, Denmark; Laboratory of Applied Microbiology, University of Applied Sciences Southern Switzerland, Bellinzona, Switzerland; Department of Botany and Plant Biology, Microbiology Unit, University of Geneva, Geneva, Switzerland; Alpine Biology Center Foundation, Bellinzona, Switzerland; Department of Biology, Section for Marine Biology, University of Copenhagen, Helsingør, Denmark

Recommended Citation:
Posth N.R.,Bristow L.A.,Cox R.P.,et al. Carbon isotope fractionation by anoxygenic phototrophic bacteria in euxinic Lake Cadagno[J]. Geobiology,2017-01-01,15(6)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Posth N.R.]'s Articles
[Bristow L.A.]'s Articles
[Cox R.P.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Posth N.R.]'s Articles
[Bristow L.A.]'s Articles
[Cox R.P.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Posth N.R.]‘s Articles
[Bristow L.A.]‘s Articles
[Cox R.P.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.