High rates of anaerobic methanotrophy at low sulfate concentrations with implications for past and present methane levels

E. J. Beal, M. W. Claire, C. H. House

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

Despite the importance of the anaerobic oxidation of methane (AOM) to global biogeochemical cycles, the relationship between sulfate concentration and the rate of AOM has not been previously experimentally constrained. Here, we present measurements showing substantial methane oxidation at low sulfate concentrations, with no significant decrease in the rate of AOM until sulfate levels are well below 1mm. At sulfate levels below 1mm, there appears to be a strong decoupling of AOM and sulfate reduction, with a 13C-label transferred from methane to carbon dioxide occurring at a rate almost an order of magnitude faster than the observed rate of sulfate reduction. These results allow for the possibility that high rates of AOM occurred in the Archean oceans and that high rates of AOM may be found in freshwater environments (lakes, rivers, etc.) and deep ocean sediments today.

Original languageEnglish (US)
Pages (from-to)131-139
Number of pages9
JournalGeobiology
Volume9
Issue number2
DOIs
StatePublished - Mar 1 2011

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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