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

DOI Web Site 5 Citations
  • Joerg S. Deutzmann
    Department of Biology, University of Constance, D-78457 Constance, Germany;
  • Peter Stief
    Microsensor Group, Max Planck Institute for Marine Microbiology, D-28359 Bremen, Germany; and
  • Josephin Brandes
    Department of Biology, University of Constance, D-78457 Constance, Germany;
  • Bernhard Schink
    Department of Biology, University of Constance, D-78457 Constance, Germany;

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Published
2014-12-03
DOI
  • 10.1073/pnas.1411617111
Publisher
Proceedings of the National Academy of Sciences

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<jats:title>Significance</jats:title> <jats:p>Evidence whether the recently discovered denitrification-dependent methane oxidation (nitrate/nitrite-dependent anaerobic methane oxidation, n-damo) represents a major methane sink or an insignificant side aspect in the global methane cycle is scarce. High-resolution microprofiles measured in intact sediment cores close to in situ conditions, anoxic incubations of intact sediments, and quantification of the responsible microorganisms with molecular techniques proved n-damo to be the major methane sink in Lake Constance, one of the best-studied freshwater lakes. The n-damo process has long been overlooked because of the close proximity of aerobic and anaerobic activities. Our study documents that a large part of methane previously thought to be oxidized aerobically is in fact oxidized anaerobically by physiologically entirely different organisms.</jats:p>

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