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Anaerobic methane oxidation coupled to denitrification is the dominant methane sink in a deep lake

Anaerobic methane oxidation coupled to denitrification is the dominant methane sink in a deep lake

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DEUTZMANN, Joerg S., Peter STIEF, Josephin BRANDES, Bernhard SCHINK, 2014. Anaerobic methane oxidation coupled to denitrification is the dominant methane sink in a deep lake. In: Proceedings of the National Academy of Sciences of the United States of America. 111(51), pp. 18273-18278. ISSN 0027-8424. eISSN 1091-6490

@article{Deutzmann2014Anaer-29534, title={Anaerobic methane oxidation coupled to denitrification is the dominant methane sink in a deep lake}, year={2014}, doi={10.1073/pnas.1411617111}, number={51}, volume={111}, issn={0027-8424}, journal={Proceedings of the National Academy of Sciences of the United States of America}, pages={18273--18278}, author={Deutzmann, Joerg S. and Stief, Peter and Brandes, Josephin and Schink, Bernhard} }

Schink, Bernhard Anaerobic methane oxidation coupled to denitrification is the dominant methane sink in a deep lake Stief, Peter 2015-01-16T15:34:36Z Deutzmann, Joerg S. Anaerobic methane oxidation coupled to denitrification, also known as “nitrate/nitrite-dependent anaerobic methane oxidation” (n-damo), was discovered in 2006. Since then, only a few studies have identified this process and the associated microorganisms in natural environments. In aquatic sediments, the close proximity of oxygen- and nitrate-consumption zones can mask n-damo as aerobic methane oxidation. We therefore investigated the vertical distribution and the abundance of denitrifying methanotrophs related to Candidatus Methylomirabilis oxyfera with cultivation-independent molecular techniques in the sediments of Lake Constance. Additionally, the vertical distribution of methane oxidation and nitrate consumption zones was inferred from high-resolution microsensor profiles in undisturbed sediment cores. M. oxyfera-like bacteria were virtually absent at shallow-water sites (littoral sediment) and were very abundant at deep-water sites (profundal sediment). In profundal sediment, the vertical distribution of M. oxyfera-like bacteria showed a distinct peak in anoxic layers that coincided with the zone of methane oxidation and nitrate consumption, a strong indication for n-damo carried out by M. oxyfera-like bacteria. Both potential n-damo rates calculated from cell densities (660–4,890 µmol CH4⋅m<sup>−2</sup>⋅d<sup>−1</sup>) and actual rates calculated from microsensor profiles (31–437 µmol CH4⋅m<sup>−2</sup>⋅d<sup>−1</sup>) were sufficiently high to prevent methane release from profundal sediment solely by this process. Additionally, when nitrate was added to sediment cores exposed to anoxic conditions, the n-damo zone reestablished well below the sediment surface, completely preventing methane release from the sediment. We conclude that the previously overlooked n-damo process can be the major methane sink in stable freshwater environments if nitrate is available in anoxic zones. Deutzmann, Joerg S. Brandes, Josephin 2014 Stief, Peter Brandes, Josephin 2015-01-16T15:34:36Z eng Schink, Bernhard

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