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dc.contributor.authorWeber, Yuki
dc.contributor.authorSinninghe Damsté, Jaap S.
dc.contributor.authorZopfi, Jakob
dc.contributor.authorDe Jonge, Cindy
dc.contributor.authorGilli, Adrian
dc.contributor.authorSchubert, Carsten J.
dc.contributor.authorLepori, Fabio
dc.contributor.authorLehmann, Moritz F.
dc.contributor.authorNiemann, Helge
dc.date.accessioned2018-11-06T11:24:40Z
dc.date.available2018-11-06T11:24:40Z
dc.date.issued2018-10-23
dc.description.abstractTerrestrial paleoclimate archives such as lake sediments are essential for our understanding of the continental climate system and for the modeling of future climate scenarios. However, quantitative proxies for the determination of paleotemperatures are sparse. The relative abundances of certain bacterial lipids, i.e., branched glycerol dialkyl glycerol tetraethers (brGDGTs), respond to changes in environmental temperature, and thus have great potential for climate reconstruction. Their application to lake deposits, however, is hampered by the lack of fundamental knowledge on the ecology of brGDGT-producing microbes in lakes. Here, we show that brGDGTs are synthesized by multiple groups of bacteria thriving under contrasting redox regimes in a deep meromictic Swiss lake (Lake Lugano). This niche partitioning is evidenced by highly distinct brGDGT inventories in oxic vs. anoxic water masses, and corresponding vertical patterns in bacterial 16S rRNA gene abundances, implying that sedimentary brGDGT records are affected by temperature-independent changes in the community composition of their microbial producers. Furthermore, the stable carbon isotope composition (δ<sup>13</sup>C) of brGDGTs in Lake Lugano and 34 other (peri-)Alpine lakes attests to the widespread heterotrophic incorporation of <sup>13</sup>C-depleted, methane-derived biomass at the redox transition zone of mesotrophic to eutrophic lake systems. The brGDGTs produced under such hypoxic/methanotrophic conditions reflect near-bottom water temperatures, and are characterized by comparatively low δ<sup>13</sup>C values. Depending on climate zone and water depth, lake sediment archives predominated by deeper water/low-<sup>13</sup>C brGDGTs may provide more reliable records of climate variability than those where brGDGTs derive from terrestrial and/or aquatic sources with distinct temperature imprints.en_US
dc.description.sponsorshipSwiss National Science Foundation Grants The Netherlands Earth System Science Centre Dutch Ministry for Education, Culture and Scienceen_US
dc.descriptionSource at <a href=https://doi.org/10.1073/pnas.1805186115> https://doi.org/10.1073/pnas.1805186115</a>.en_US
dc.identifier.citationWeber, Y., Sinninghe Damsté, J.S., Zopfi, J., De Jonge, C., Gilli, A., Schubert, C.J., ... Niemann, H. (2018). Redox-dependent niche differentiation provides evidence for multiple bacterial sources of glycerol tetraether lipids in lakes. Proceedings of the National Academy of Sciences of the United States of America, 115(43), 10926-10931. https://doi.org/10.1073/pnas.1805186115en_US
dc.identifier.cristinIDFRIDAID 1626950
dc.identifier.doi10.1073/pnas.1805186115
dc.identifier.issn0027-8424
dc.identifier.issn1091-6490
dc.identifier.urihttps://hdl.handle.net/10037/14098
dc.language.isoengen_US
dc.publisherNational Academy of Sciencesen_US
dc.relation.journalProceedings of the National Academy of Sciences of the United States of America
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/H2020-EU.1.1./694569/EU/Microbial lipids: The three domain ‘lipid divide’ revisited/MICROLIPIDS/en_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Mathematics and natural science: 400::Basic biosciences: 470en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Basale biofag: 470en_US
dc.subjectPaleoclimateen_US
dc.subjectLakesen_US
dc.subjectGDGTen_US
dc.subjectδ13Cen_US
dc.subjectmicrobial ecologyen_US
dc.titleRedox-dependent niche differentiation provides evidence for multiple bacterial sources of glycerol tetraether lipids in lakesen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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