Journal
AQUATIC MICROBIAL ECOLOGY
Volume 79, Issue 3, Pages 177-195Publisher
INTER-RESEARCH
DOI: 10.3354/ame01826
Keywords
Marine sediment; Bacteria; Archaea; Microbial diversity; 16S rRNA
Categories
Funding
- Danish National Research Foundation [DNRF104]
- ERC [294200]
- Carlsberg Foundation
- Julie von-Moellen Foundation
- Danish Agency for Science, Technology and Innovation
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Marine sediments are densely populated by diverse communities of archaea and bacteria, with intact cells detected kilometers below the seafloor. Analyses of microbial diversity in these unique environments have identified several dominant taxa that comprise a significant portion of the community in geographically and environmentally disparate locations. While the distributions of these populations are well documented, there is significantly less information describing the means by which such specialized communities assemble within the sediment column. Here, we review known patterns of subsurface microbial community composition and perform a meta-analysis of publicly available 16S rRNA gene datasets collected from 9 locations at depths from 1 cm to > 2 km below the surface. All data are discussed in relation to the 4 major processes of microbial community assembly: diversification, dispersal, selection, and drift. Microbial diversity in the subsurface decreases with depth on a global scale. The transition from the seafloor to the deep subsurface biosphere is marked by a filtering of populations from the surface that leaves only a subset of taxa to populate the deeper sediment zones, indicating that selection is a main mechanism of community assembly. The physiological underpinnings for the success of these persisting taxa are largely unknown, as the majority of them lack cultured representatives. Ecological explanations for the observed trends are presented, including the possible influence of energy depletion and the physiological basis of major taxonomic shifts.
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