The critical role of pore size on depth-dependent microbial cell counts in sediments.

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 Rep

journal_title

Scientific reports

authors

Park J,Santamarina JC

doi

10.1038/s41598-020-78714-3

subject

Has Abstract

pub_date

2020-12-10 00:00:00

pages

21692

issue

1

issn

2045-2322

pii

10.1038/s41598-020-78714-3

journal_volume

10

pub_type

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