Fluctuations in populations of subsurface methane oxidizers in coordination with changes in electron acceptor availability

C. Magnabosco*, P.H.A. Timmers, M.C.Y. Lau, G. Borgonie, B. Linage-Alvarez, O. Kuloyo, R. Alleva, T.L. Kieft, G.F. Slater, E. van Heerden, B. Sherwood Lollar, T.C. Onstott

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)

Abstract

The concentrations of electron donors and acceptors in the terrestrial subsurface biosphere fluctuate due to migration and mixing of subsurface fluids, but the mechanisms and rates at which microbial communities respond to these changes are largely unknown. Subsurface microbial communities exhibit long cellular turnover times and are often considered relatively static-generating just enough ATP for cellular maintenance. Here, we investigated how subsurface populations of CH4 oxidizers respond to changes in electron acceptor availability by monitoring the biological and geochemical composition in a 1339 m-below-land-surface (mbls) fluid-filled fracture over the course of both longer (2.5 year) and shorter (2-week) time scales. Using a combination of metagenomic, metatranscriptomic, and metaproteomic analyses, we observe that the CH4 oxidizers within the subsurface microbial community change in coordination with electron acceptor availability over time. We then validate these findings through a series of 13C-CH4 laboratory incubation experiments, highlighting a connection between composition of subsurface CH4 oxidizing communities and electron acceptor availability.

Original languageEnglish
Article numberfiy089
JournalFEMS microbiology ecology
Volume94
Issue number7
DOIs
Publication statusPublished - 1 Jul 2018

Keywords

  • Archaea
  • Metagenomics
  • Methane oxidation
  • Subsurface

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