Cargando…
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...
Autores principales: | , , , , |
---|---|
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 |
_version_ | 1783315293158768640 |
---|---|
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. |
format | Online Article Text |
id | pubmed-5905624 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Oxford University Press |
record_format | MEDLINE/PubMed |
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 |
work_keys_str_mv | AT vuilleminaurele microbialcommunitycompositionalonga50000yearlacustrinesedimentsequence AT arizteguidaniel microbialcommunitycompositionalonga50000yearlacustrinesedimentsequence AT hornfabian microbialcommunitycompositionalonga50000yearlacustrinesedimentsequence AT kallmeyerjens microbialcommunitycompositionalonga50000yearlacustrinesedimentsequence AT orsiwilliamd microbialcommunitycompositionalonga50000yearlacustrinesedimentsequence AT microbialcommunitycompositionalonga50000yearlacustrinesedimentsequence |