globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12151
Scopus记录号: 2-s2.0-84944145632
论文题名:
Impact of paleoclimate on the distribution of microbial communities in the subsurface sediment of the Dead Sea
作者: Thomas C.; Ionescu D.; Ariztegui D.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2015
卷: 13, 期:6
起始页码: 546
结束页码: 561
语种: 英语
Scopus关键词: climate variation ; halite ; lacustrine deposit ; lithology ; microbial community ; paleoclimate ; salinity ; sediment core ; sedimentation rate ; Dead Sea ; Archaea ; Bacteria (microorganisms) ; Euryarchaeota ; Halobacteriaceae ; archaeal DNA ; RNA 16S ; salt water ; archaeon ; classification ; climate ; DNA sequence ; Euryarchaeota ; genetics ; isolation and purification ; Israel ; Jordan ; microbiology ; molecular genetics ; phylogeny ; sediment ; Archaea ; Climate ; DNA, Archaeal ; Euryarchaeota ; Geologic Sediments ; Israel ; Jordan ; Molecular Sequence Data ; Phylogeny ; RNA, Ribosomal, 16S ; Saline Waters ; Sequence Analysis, DNA
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: A long sedimentary core has been recently retrieved from the Dead Sea Basin (DSB) within the framework of the ICDP-sponsored Dead Sea Deep Drilling Project. Contrasting climatic intervals were evident by distinctive lithological facies such as laminated aragonitic muds and evaporites. A geomicrobiological investigation was conducted in representative sediments of this core. To identify the microbial assemblages present in the sediments and their evolution with changing depositional environments through time, the diversity of the 16S rRNA gene was analyzed in gypsum, aragonitic laminae, and halite samples. The subsurface microbial community was largely dominated by the Euryarchaeota phylum (Archaea). Within the latter, Halobacteriaceae members were ubiquitous, probably favored by their 'high salt-in' osmotic adaptation which also makes them one of the rare inhabitants of the modern Dead Sea. Bacterial community members were scarce, emphasizing that the 'low salt-in' strategy is less suitable in this environment. Substantial differences in assemblages are observed between aragonitic sediments and gypsum-halite ones, independently of the depth and salinity. The aragonite sample, deposited during humid periods when the lake was stratified, consists mostly of the archaeal MSBL1 and bacterial KB1 Candidate Divisions. This consortium probably relies on compatible solutes supplied from the lake by halotolerant species present in these more favorable periods. In contrast, members of the Halobacteriaceae were the sole habitants of the gypsum-halite sediments which result from a holomictic lake. Although the biomass is low, these variations in the observed subsurface microbial populations appear to be controlled by biological conditions in the water column at the time of sedimentation, and subsequently by the presence or absence of stratification and dilution in the lake. As the latter are controlled by climatic changes, our data suggest a relationship between local lacustrine subsurface microbial assemblages and large-scale climatic variations over the Dead Sea Basin. © 2015 John Wiley & Sons Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85122
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作者单位: Department of Earth Sciences, University of Geneva, Geneva, Switzerland; Leibniz Institute for Freshwater Ecology and Inland Fisheries, Stechlin, Germany

Recommended Citation:
Thomas C.,Ionescu D.,Ariztegui D.. Impact of paleoclimate on the distribution of microbial communities in the subsurface sediment of the Dead Sea[J]. Geobiology,2015-01-01,13(6)
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