Why do sulfate-reducing bacteria outcompete methanogenic bacteria for substrates?
- 1 November 1983
- journal article
- research article
- Published by Springer Nature in Oecologia
- Vol. 60 (2), 264-266
- https://doi.org/10.1007/bf00379530
Abstract
The apparent Ks values for H2 of several phylogenetically distant strains of both methanogenic bacteria and sulfate-reducing bacteria were measured. The sulfate reducers had Ks values of about 2 μM whereas the Ks values of the methanogens were 6–20 μM. This indicates that probably all sulfate-reducing bacteria have a higher substrate affinity for H2 than the methanogenic bacteria. Difference in substrate affinity can thus account for the inhibition of methanogenesis from H2 and CO2 in sulfate-rich ecosystems (mainly saltwater marshes), where the H2 concentration is well below 5 μM. Possible explanations for this general phenomenon are discussed.Keywords
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