Abstract:
:Cell counts decrease with sediment depth. Typical explanations consider limiting factors such as water availability and chemistry, carbon source, nutrients, energy and temperature, and overlook the role of pore size. Our analyses consider sediment self-compaction, the evolution of pore size with depth, and the probability of pores larger than the microbial size to compute the volume fraction of life-compatible pores. We evaluate cell counts vs. depth profiles gathered at 116 sites worldwide. Results confirm the critical role of pore size on cell counts in the subsurface and explain much of the data spread (from ~ 9 orders of magnitude range in cell counts to ~ 2 orders). Cells colonize pores often forming dense biofilms, thus, cell counts in pores are orders of magnitude higher than in the water column. Similar arguments apply to rocks.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Park J,Santamarina JCdoi
10.1038/s41598-020-78714-3subject
Has Abstractpub_date
2020-12-10 00:00:00pages
21692issue
1issn
2045-2322pii
10.1038/s41598-020-78714-3journal_volume
10pub_type
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