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Why do sulfate-reducing bacteria outcompete methanogenic bacteria for substrates? (1983)

Kristjansson, J. K. ; Schönheit, P.

Springer

Oecologia 60 (1983), S. 264-266

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ISSN: 1432-1939

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary 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.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00379530

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