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Microbial community composition along a 50 000-year lacustrine sediment sequence

For decades, microbial community composition in subseafloor sediments has been the focus of extensive studies. In deep lacustrine sediments, however, the taxonomic composition of microbial communities remains undercharacterized. Greater knowledge on microbial diversity in lacustrine sediments would...

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Autores principales: Vuillemin, Aurèle, Ariztegui, Daniel, Horn, Fabian, Kallmeyer, Jens, Orsi, William D
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5905624/
https://www.ncbi.nlm.nih.gov/pubmed/29471361
http://dx.doi.org/10.1093/femsec/fiy029
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author Vuillemin, Aurèle
Ariztegui, Daniel
Horn, Fabian
Kallmeyer, Jens
Orsi, William D
author_facet Vuillemin, Aurèle
Ariztegui, Daniel
Horn, Fabian
Kallmeyer, Jens
Orsi, William D
author_sort Vuillemin, Aurèle
collection PubMed
description For decades, microbial community composition in subseafloor sediments has been the focus of extensive studies. In deep lacustrine sediments, however, the taxonomic composition of microbial communities remains undercharacterized. Greater knowledge on microbial diversity in lacustrine sediments would improve our understanding of how environmental factors, and resulting selective pressures, shape subsurface biospheres in marine and freshwater sediments. Using high-throughput sequencing of 16S rRNA genes across high-resolution climate intervals covering the last 50 000 years in Laguna Potrok Aike, Argentina, we identified changes in microbial populations in response to both past environmental conditions and geochemical changes of the sediment during burial. Microbial communities in Holocene sediments were most diverse, reflecting a layering of taxa linked to electron acceptors availability. In deeper intervals, the data show that salinity, organic matter and the depositional conditions over the Last Glacial-interglacial cycle were all selective pressures in the deep lacustrine assemblage resulting in a genetically distinct biosphere from the surface dominated primarily by Bathyarchaeota and Atribacteria groups. However, similar to marine sediments, some dominant taxa in the shallow subsurface persisted into the subsurface as minor fraction of the community. The subsequent establishment of a deep subsurface community likely results from a combination of paleoenvironmental factors that have shaped the pool of available substrates, together with substrate depletion and/or reworking of organic matter with depth.
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spelling pubmed-59056242018-04-23 Microbial community composition along a 50 000-year lacustrine sediment sequence Vuillemin, Aurèle Ariztegui, Daniel Horn, Fabian Kallmeyer, Jens Orsi, William D FEMS Microbiol Ecol Research Article For decades, microbial community composition in subseafloor sediments has been the focus of extensive studies. In deep lacustrine sediments, however, the taxonomic composition of microbial communities remains undercharacterized. Greater knowledge on microbial diversity in lacustrine sediments would improve our understanding of how environmental factors, and resulting selective pressures, shape subsurface biospheres in marine and freshwater sediments. Using high-throughput sequencing of 16S rRNA genes across high-resolution climate intervals covering the last 50 000 years in Laguna Potrok Aike, Argentina, we identified changes in microbial populations in response to both past environmental conditions and geochemical changes of the sediment during burial. Microbial communities in Holocene sediments were most diverse, reflecting a layering of taxa linked to electron acceptors availability. In deeper intervals, the data show that salinity, organic matter and the depositional conditions over the Last Glacial-interglacial cycle were all selective pressures in the deep lacustrine assemblage resulting in a genetically distinct biosphere from the surface dominated primarily by Bathyarchaeota and Atribacteria groups. However, similar to marine sediments, some dominant taxa in the shallow subsurface persisted into the subsurface as minor fraction of the community. The subsequent establishment of a deep subsurface community likely results from a combination of paleoenvironmental factors that have shaped the pool of available substrates, together with substrate depletion and/or reworking of organic matter with depth. Oxford University Press 2018-02-20 /pmc/articles/PMC5905624/ /pubmed/29471361 http://dx.doi.org/10.1093/femsec/fiy029 Text en © FEMS 2018. http://creativecommons.org/licenses/by-nc/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com
spellingShingle Research Article
Vuillemin, Aurèle
Ariztegui, Daniel
Horn, Fabian
Kallmeyer, Jens
Orsi, William D
Microbial community composition along a 50 000-year lacustrine sediment sequence
title Microbial community composition along a 50 000-year lacustrine sediment sequence
title_full Microbial community composition along a 50 000-year lacustrine sediment sequence
title_fullStr Microbial community composition along a 50 000-year lacustrine sediment sequence
title_full_unstemmed Microbial community composition along a 50 000-year lacustrine sediment sequence
title_short Microbial community composition along a 50 000-year lacustrine sediment sequence
title_sort microbial community composition along a 50 000-year lacustrine sediment sequence
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5905624/
https://www.ncbi.nlm.nih.gov/pubmed/29471361
http://dx.doi.org/10.1093/femsec/fiy029
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