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Gene-based modeling of methane oxidation in coastal sediments : constraints on the efficiency of the microbial methane filter
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- Lenstra, Wytze K. (författare)
- Wytze K. Lenstra − Department of Earth Sciences - Geochemistry, Utrecht University, Utrecht, the Netherlands; Department of Microbiology, Radboud Institute for Biological and Environmental Sciences, Radboud University, Nijmegen, The Netherlands,UMFpub
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- van Helmond, Niels A. G. M. (författare)
- Department of Earth Sciences - Geochemistry, Utrecht University, Utrecht, The Netherlands; Department of Microbiology, Radboud Institute for Biological and Environmental Sciences, Radboud University, Nijmegen, The Netherlands
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- Martins, Paula Dalcin (författare)
- Department of Microbiology, Radboud Institute for Biological and Environmental Sciences, Radboud University, Nijmegen, The Netherlands
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- Wytze K Lenstra − Department of Earth Sciences - Geochemistry, Utrecht University, Utrecht, the Netherlands; Department of Microbiology, Radboud Institute for Biological and Environmental Sciences, Radboud University, Nijmegen, The Netherlands UMFpub (creator_code:org_t)
- American Chemical Society (ACS), 2023
- 2023
- Engelska.
- Ingår i: Environmental Science and Technology. - : American Chemical Society (ACS). - 0013-936X .- 1520-5851. ; 57:34, s. 12722-12731
- Tidskriftsartikel (refereegranskat)
Abstract
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- Methane is a powerful greenhouse gas that is produced in large quantities in marine sediments. Microbially mediated oxidation of methane in sediments, when in balance with methane production, prevents the release of methane to the overlying water. Here, we present a gene-based reactive transport model that includes both microbial and geochemical dynamics and use it to investigate whether the rate of growth of methane oxidizers in sediments impacts the efficiency of the microbial methane filter. We focus on iron- and methane-rich coastal sediments and, with the model, show that at our site, up to 10% of all methane removed is oxidized by iron and manganese oxides, with the remainder accounted for by oxygen and sulfate. We demonstrate that the slow growth rate of anaerobic methane-oxidizing microbes limits their ability to respond to transient perturbations, resulting in periodic benthic release of methane. Eutrophication and deoxygenation decrease the efficiency of the microbial methane filter further, thereby enhancing the role of coastal environments as a source of methane to the atmosphere.
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- NATURVETENSKAP -- Biologi -- Mikrobiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Microbiology (hsv//eng)
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