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dc.contributor.authorSteinle, Lea
dc.contributor.authorKnittel, Katrin
dc.contributor.authorFelber, Nicole
dc.contributor.authorCasalino, Claudia
dc.contributor.authorde Lange, Gert
dc.contributor.authorTessarolo, Chiara
dc.contributor.authorStadnitskaia, Alina
dc.contributor.authorSinninghe Damsté, Jaap S.
dc.contributor.authorZopfi, Jakob
dc.contributor.authorLehmann, Moritz F.
dc.contributor.authorTreude, Tina
dc.date.accessioned2019-03-25T12:53:41Z
dc.date.available2019-03-25T12:53:41Z
dc.date.issued2018-04-17
dc.description.abstractThe Kryos Basin is a deep-sea hypersaline anoxic basin (DHAB) located in the Eastern Mediterranean Sea (34.98°N 22.04°E). It is filled with brine of re-dissolved Messinian evaporites and is nearly saturated with MgCl<sub>2</sub>-equivalents, which makes this habitat extremely challenging for life. The strong density difference between the anoxic brine and the overlying oxic Mediterranean seawater impedes mixing, giving rise to a narrow chemocline. Here, we investigate the microbial community structure and activities across the seawater–brine interface using a combined biogeochemical, next-generation sequencing, and lipid biomarker approach. Within the interface, we detected fatty acids that were distinctly <sup>13</sup>C-enriched when compared to other fatty acids. These likely originated from sulfide-oxidizing bacteria that fix carbon via the reverse tricarboxylic acid cycle. In the lower part of the interface, we also measured elevated rates of methane oxidation, probably mediated by aerobic methanotrophs under micro-oxic conditions. Sulfate reduction rates increased across the interface and were highest within the brine, providing first evidence that sulfate reducers (likely <i>Desulfovermiculus</i> and <i>Desulfobacula</i>) thrive in the Kryos Basin at a water activity of only ~0.4 A<sub>w</sub>. Our results demonstrate that a highly specialized microbial community in the Kryos Basin has adapted to the poly-extreme conditions of a DHAB with nearly saturated MgCl<sub>2</sub> brine, extending the known environmental range where microbial life can persist.en_US
dc.description.sponsorshipSwiss National Science Foundation German Research foundation Max Planck Society, Germanyen_US
dc.descriptionSource at <a href=https://doi.org/10.1038/s41396-018-0107-z>https://doi.org/10.1038/s41396-018-0107-z</a>.en_US
dc.identifier.citationSteinle, L., Knittel, K., Felber, N., Casalino, C., de Lange, G., Tessarolo, C., ... Niemann H. (2018). Life on the edge: active microbial communities in the Kryos MgCl2- brine basin at very low water activity. <i>The ISME Journal, 12</i>(6), 1414-1426. https://doi.org/10.1038/s41396-018-0107-zen_US
dc.identifier.cristinIDFRIDAID 1580897
dc.identifier.doi10.1038/s41396-018-0107-z
dc.identifier.issn1751-7362
dc.identifier.issn1751-7370
dc.identifier.urihttps://hdl.handle.net/10037/15059
dc.language.isoengen_US
dc.publisherSpringer Natureen_US
dc.relation.journalThe ISME Journal
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/H2020/644385/EU/PERvasive Serious GAMes suppOrted by Virtual CoachiNg/PERGAMON/en_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497en_US
dc.subjectVDP::Mathematics and natural science: 400::Basic biosciences: 470::General microbiology: 472en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Basale biofag: 470::Generell mikrobiologi: 472en_US
dc.subjectVDP::Mathematics and natural science: 400::Basic biosciences: 470::Biochemistry: 476en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Basale biofag: 470::Biokjemi: 476en_US
dc.titleLife on the edge: Active microbial communities in the Kryos MgCl2-brine basin at very low water activityen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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