Biogeosciences
Biogeosciences
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Articles | Volume 23, issue 8
Articles | Volume 23, issue 8
https://doi.org/10.5194/bg-23-2909-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-2909-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 8
Research article
 | 
29 Apr 2026
Research article |  | 29 Apr 2026

Imprint of eutrophication on methane-cycling microbes in freshwater sediment

Alice Bosco-Santos, Eulalie Rose Beyala Bekono, Santona Khatun, Marie-Ève Monchamp, Joana Séneca, Petra Pjevac, and Jasmine S. Berg

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Short summary
From a 400-year sediment record in Lake Joux, we ask how past eutrophication shapes present methane cycling. Integrating sediment and water chemistry, stable carbon isotopes, and genetic sequencing, we reveal clear depth zoning of methane-producing microbes and frequent oxygen-using methane consumers even where oxygen is not detected; both rise with nitrate and phosphate. These sediment legacies influence future methane release.
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