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

Junghee Park, Carlos Santamarina

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

AbstractCell 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.
Original languageEnglish (US)
JournalScientific Reports
Volume10
Issue number1
DOIs
StatePublished - Dec 10 2020

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