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Microbial Selection and Survival in Subseafloor Sediment
- Source :
- Frontiers in Microbiology, Frontiers in Microbiology, Vol 10 (2019)
- Publication Year :
- 2019
- Publisher :
- Frontiers Media SA, 2019.
-
Abstract
- Many studies have examined relationships of microorganisms to geochemical zones in subseafloor sediment. However, responses to selective pressure and patterns of community succession with sediment depth have rarely been examined. Here we use 16S rDNA sequencing to examine the succession of microbial communities at sites in the Indian Ocean and the Bering Sea. The sediment ranges in depth from 0.16 to 332 m below seafloor and in age from 660 to 1,300,000 years. The majority of subseafloor taxonomic diversity is present in the shallowest depth sampled. The best predictor of sequence presence or absence in the oldest sediment is relative abundance in the near-seafloor sediment. This relationship suggests that perseverance of specific taxa into deep, old sediment is primarily controlled by the taxonomic abundance that existed when the sediment was near the seafloor. The operational taxonomic units that dominate at depth comprise a subset of the local seafloor community at each site, rather than a grown-in group of geographically widespread subseafloor specialists. At both sites, most taxa classified as abundant decrease in relative frequency with increasing sediment depth and age. Comparison of community composition to cell counts at the Bering Sea site indicates that the rise of the few dominant taxa in the deep subseafloor community does not require net replication, but might simply result from lower mortality relative to competing taxa on the long timescale of community burial.
- Subjects :
- Microbiology (medical)
lcsh:QR1-502
Ecological succession
Microbiology
lcsh:Microbiology
03 medical and health sciences
marine sediment archaea
Abundance (ecology)
16S rDNA
deep biosphere
microbial selection
14. Life underwater
Relative species abundance
marine sediment bacteria
Original Research
030304 developmental biology
0303 health sciences
030306 microbiology
Ecology
Sediment
Seafloor spreading
Indian ocean
Taxon
NGHP-14
Lower mortality
U1343
Geology
Subjects
Details
- ISSN :
- 1664302X
- Volume :
- 10
- Database :
- OpenAIRE
- Journal :
- Frontiers in Microbiology
- Accession number :
- edsair.doi.dedup.....539b78bca09e27042f32a6eb8f72fe18