Methanogenesis in subglacial sediments

Eric S. Boyd, Mark Skidmore, Andrew C. Mitchell, Corien Bakermans, John W. Peters

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

Methanogenic archaea have a unique role in Earth's global carbon cycle as producers of the greenhouse gas methane (CH4). However, despite the fact that ice covers 11% of Earth's continental landmass, evidence for methanogenic activity in subglacial environments has yet to be clearly demonstrated. Here we present genetic, biochemical and geochemical evidence indicative of an active population of methanogens associated with subglacial sediments from Robertson Glacier (RG), Canadian Rockies. Porewater CH4 was quantified in two subglacial sediment cores at concentrations of 16 and 29 ppmv. Coenzyme M (CoM), a metabolic biomarker for methanogens, was detected at a concentration of 1.3 nmol g sediment-1 corresponding to ~3 × 103 active cells g sediment-1. Genetic characterization of communities associated with subglacial sediments indicated the presence of several archaeal 16S rRNA and methyl CoM reductase subunit A (mcrA) gene phylotypes, all of which were affiliated with the euryarchaeal order Methanosarcinales. Further, CH4 was produced at 9-51 fmol g dry weight sediment-1 h-1 in enrichment cultures of RG sediments incubated at 4°C. Collectively, these findings have important implications for the global carbon cycle in light of recent estimates indicating that the Earth's subglacial biome ranges from 104 to 106 km3 sediment.

Original languageEnglish (US)
Pages (from-to)685-692
Number of pages8
JournalEnvironmental Microbiology Reports
Volume2
Issue number5
DOIs
StatePublished - Oct 1 2010

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Agricultural and Biological Sciences (miscellaneous)

Fingerprint Dive into the research topics of 'Methanogenesis in subglacial sediments'. Together they form a unique fingerprint.

Cite this