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Scientific article
English

Archaeal populations in two distinct sedimentary facies of the subsurface of the Dead Sea

ContributorsThomas, Camille; Ionescu, D.; Ariztegui, Danielorcid; DSDDP Scientific Team
Published inMarine genomics, vol. 17, p. 53-62
Publication date2014
Abstract

Archaeal metabolism was studied in aragonitic and gypsum facies of the Dead Sea subsurface using highthroughput DNA sequencing. We show that the communities are well adapted to the peculiar environment of the Dead Sea subsurface. They harbor the necessary genes to deal with osmotic pressure using high- and lowsalt-in strategies, and to cope with unusually high concentrations of heavy metals. Methanogenesis was identified for the first time in the Dead Sea and appears to be an important metabolism in the aragonite sediment. Fermentation of residual organic matter, probably performed by some members of the Halobacteria class is common to both types of sediments. The latter group representsmore than 95% of the taxonomically identifiable Archaea in the metagenome of the gypsum sediment. The potential for sulfur reduction has also been revealed and is associated in the sediment with EPS degradation and Fe–S mineralization as revealed by SEM imaging. Overall, we show that distinct communities of Archaea are associated with the two different facies of the Dead Sea, and are adapted to the harsh chemistry of its subsurface, in different ways.

Keywords
  • Hypersaline
  • Metagenomics
  • Methanogenesis
  • Halobacteria
  • Dead Sea Subsurface
Funding
  • Swiss National Science Foundation - Projects 200021-132529 and 200020-149221/1.
  • Autre - ICDP
Citation (ISO format)
THOMAS, Camille, IONESCU, D., ARIZTEGUI, Daniel. Archaeal populations in two distinct sedimentary facies of the subsurface of the Dead Sea. In: Marine genomics, 2014, vol. 17, p. 53–62. doi: 10.1016/j.margen.2014.09.001
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Article (Published version)
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Identifiers
ISSN of the journal1874-7787
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