Articles | Volume 17, issue 4
Biogeosciences, 17, 1063–1069, 2020
Biogeosciences, 17, 1063–1069, 2020

Research article 26 Feb 2020

Research article | 26 Feb 2020

Acetate turnover and methanogenic pathways in Amazonian lake sediments

Ralf Conrad et al.

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Cited articles

Beulig, F., Roey, H., Glombitza, C., and Joergensen, B. B.: Control on rate and pathway of anaerobic organic carbon degradation in the seabed, P. Natl. Acad. Sci. USA, 115, 367–372, 2018. 
Christensen, D. and Blackburn, T. H.: Turnover of 14C-labelled acetate in marine sediments, Mar. Biol., 71, 113–119, 1982. 
Coates, J. D., Ellis, D. J., Blunt-Harris, E. L., Gaw, C. V., Roden, E. E., and Lovley, D. R.: Recovery of humic-reducing bacteria from a diversity of environments, Appl. Environ. Microbiol., 64, 1504–1509, 1998. 
Conrad, R.: Contribution of hydrogen to methane production and control of hydrogen concentrations in methanogenic soils and sediments, FEMS Microbiol. Ecol., 28, 193–202, 1999. 
Conrad, R., Mayer, H. P., and Wüst, M.: Temporal change of gas metabolism by hydrogen-syntrophic methanogenic bacterial associations in anoxic paddy soil, FEMS Microbiol. Ecol., 62, 265–274, 1989. 
Short summary
Lake sediments release the greenhouse gas CH4. Acetate is an important precursor. Although Amazonian lake sediments all contained acetate-consuming methanogens, measurement of the turnover of labeled acetate showed that some sediments converted acetate not to CH4 plus CO2, as expected, but only to CO2. Our results indicate the operation of acetate-oxidizing microorganisms couples the oxidation process to syntrophic methanogenic partners and/or to the reduction of organic compounds.
Final-revised paper