气候变化领域集成服务门户(CCPortal): Fluid inclusions from the deep Dead Sea sediment provide new insights on Holocene extreme microbial life

CCPortal

DOI	10.1016/j.quascirev.2019.03.020
	Fluid inclusions from the deep Dead Sea sediment provide new insights on Holocene extreme microbial life
	Thomas C.; Ariztegui D.
发表日期	2019
ISSN	0277-3791
起始页码	18
结束页码	27
卷号	212
英文摘要	The Dead Sea Deep Drilling Project allowed us to retrieve a continuous sedimentary record spanning the two last glacial cycles. This unique archive, in such an extreme environment, has permitted the development of new proxies and the refinement of already available paleoenvironmental studies. Although life is pushed to its extremes in the Dead Sea environment, several studies have highlighted the impact of microbial activity on this harsh milieu. The identity and means of adaptation of these organisms are however partly ignored. We also know relatively little on the way this extreme ecosystem has evolved with time, and how it will react to growing pressure. In this study, we have used the fluid inclusions trapped in halite, the main evaporitic phase during arid periods in the Dead Sea, to investigate the way the Dead Sea ecosystem has evolved. By extracting ancient DNA from Holocene halite fluid inclusions, we have obtained fossil bacterial and archaeal 16S rRNA gene sequences that suggest that the main microbial actors of the present Dead Sea have been present in the lake for a relatively long period, emphasizing the stability of this extreme environment. This is the case of extreme halophilic archaea of the Salinarchaeum genera. Additionally, we show that current phylotypes of the deep biosphere, such as Acetothermia bacteria are present within the obtained fluid inclusions sequences, which would support seeding of the deep biosphere from the water column. Finally, through the retrieval of sequences assigned to Halodesulfurarchaeum and Desulfovermiculus genera, we shed light on putative new actors of the sulfur cycle involving respectively archaea and bacteria, which could play an unexpected role in the reduction of sulfur species. Together, these data provide new research avenues for both geologists and biologists working in this extreme environment, and help to increase understanding of the evolution of the Dead Sea ecosystem with time. © 2019 Elsevier Ltd
英文关键词	Continental biomarkers; Holocene; Middle East; Paleolimnology; Paleomicrobiology
语种	英语
scopus关键词	Bacteria; Biospherics; Chloride minerals; DNA sequences; Ecosystems; Paleolimnology; RNA; Sodium chloride; Sulfur; 16S rRNA gene sequence; Extreme environment; Holocenes; Microbial activities; Middle East; Paleoenvironmental study; Paleomicrobiology; Sedimentary records; Mineralogy; biomarker; biosphere; Deep Sea Drilling Project; Holocene; Last Glacial; marine ecosystem; marine environment; marine sediment; microbial activity; paleobiology; paleoceanography; paleoenvironment; paleolimnology; water column; Dead Sea; Middle East; Archaea; Bacteria (microorganisms); Desulfovermiculus
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151953
作者单位	Department of Earth Sciences, University of Geneva, Geneva, 1205, Switzerland
推荐引用方式 GB/T 7714	Thomas C.,Ariztegui D.. Fluid inclusions from the deep Dead Sea sediment provide new insights on Holocene extreme microbial life[J],2019,212.
APA	Thomas C.,&Ariztegui D..(2019).Fluid inclusions from the deep Dead Sea sediment provide new insights on Holocene extreme microbial life.Quaternary Science Reviews,212.
MLA	Thomas C.,et al."Fluid inclusions from the deep Dead Sea sediment provide new insights on Holocene extreme microbial life".Quaternary Science Reviews 212(2019).