Sulfate ions did not inhibit methanogenesis in estuarine sediments supplemented with methanol, trimethylamine, or methionine. However, sulfate greatly retarded methanogenesis when hydrogen or acetate was the substrate. Sulfate reduction was stimulated by acetate, hydrogen, and acetate plus hydrogen, but not by methanol or trimethylamine. These results indicate that sulfate-reducing bacteria will outcompete methanogens for hydrogen, acetate, or both, but will not compete with methanogens for compounds like methanol, trimethylamine, or methionine, thereby allowing methanogenesis and sulfate reduction to operate simultaneously within anoxic, sulfate-containing sediments.
|Title||Methanogenesis and sulfate reduction: Competitive and noncompetitive substrates in estuarine sediments|
|Authors||Ronald S. Oremland, Sandra Polcin|
|Publication Subtype||Journal Article|
|Series Title||Applied and Environmental Microbiology|
|Record Source||USGS Publications Warehouse|
|USGS Organization||San Francisco Bay-Delta; Pacific Regional Director's Office|