What is it about?
Anaerobic oxidation of methane by consortium of methanotrophic archaea and sulfate-reducing bacteria plays the crucial role in carbon and sulfur cycling in marine ecosystems. Because there was no satisfying explanation for the variation of the stable isotope fractionation factors between the enrichment cultures of different origin, we proposed the model that explains the lower sulfur isotope fractionation factors at a higher rate of anaerobic oxidation of methane due to the shorter average distance between microbial consortia and the respective sulfur substrates.
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Why is it important?
We described the dynamics of anaerobic oxidation of methane coupled with sulfate reduction showing that formation of consortia of anaerobic archaea and Desulfosarcina-like bacteria may have a significant effect on sulfur isotope fractionation. A good fit of the dynamic model to experimental data was obtained only when assuming active biomass accumulation. It was shown that during anaerobic oxidation the fractionation of sulfur isotopes is universally proportional to the rate of formation of microbial consortia which coincides with an increase of the total reaction rate.
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This page is a summary of: Using kinetic isotope effect to evaluate the significance of the sequential and parallel steps: formation of microbial consortium during reversible anaerobic methane oxidation coupled with sulfate reduction, Water Science & Technology, June 2019, IWA Publishing, DOI: 10.2166/wst.2019.201.
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Vavilin V. A., Rytov S. V. & Conrad R. 2017 Modelling methane formation in sediments of tropical lakes focusing on syntrophic acetate oxidation: dynamic and static carbon isotope equations. Ecol. Modell. 363, 81–95.
Vavilin V. A., Rytov S. V. & Lokshina L. Y. 2018a Modelling the specific pathway of CH4 and CO2 formation using carbon isotope fractionation: an example for a boreal mesotrophic fen. Isot. Environ. Health Stud. 54, 475–493.
Vavilin V. A., Rytov S. V. & Brezgunov V. S. 2018b Basic equations to describe the kinetic isotope effect during microbial substrate transformation. Water Resour. 45, 937–948.
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