Feb 23, 2018

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

FEMS Microbiology Ecology
Aurèle VuilleminPASADO Science Team

Abstract

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 ...Continue Reading

  • References54
  • Citations2

References

  • References54
  • Citations2

Mentioned in this Paper

Study
Sediments, Marine
Anatomical Layer
Aquatic Organisms
Genes
Archaea
Organ
Phylogeny
Salinity
IFI6 protein, human

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