Blar i forfatter "Lehmann, Moritz F"

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    • Biomarker and isotopic composition of seep carbonates record environmental conditions in two Arctic methane seeps 

      Yao, Haoyi; Panieri, Giuliana; Lehmann, Moritz F; Himmler, Tobias; Niemann, Helge (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-12)
      Present-day activity of cold-seeps in the ocean is evident from direct observations of methane emanating from the seafloor, the presence of chemosynthetic organisms, or the quantification of gas concentrations in the water column and pore water solutes. Verifying past cold seep activity and biogeochemical characteristics is more challenging but may be reconstructed from proxy records of authigenic ...

    • Chemosynthesis influences food web and community structure in high-Arctic benthos 

      Åström, Emmelie; Carroll, Michael; Sen, Arunima; Niemann, Helge; Ambrose Jr., William G.; Lehmann, Moritz F; Carroll, JoLynn (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-10-25)
      Cold seeps are locations where seafloor communities are influenced by the seepage of methane and other reduced compounds from the seabed. We examined macro-infaunal benthos through community analysis and trophic structure using stable isotope analysis at 3 seep locations in the Barents Sea. These seeps were characterized by high densities of the chemosymbiotic polychaetes Siboglinidae, clade Frenulata ...

    • Manganese/iron‐supported sulfate‐dependent anaerobic oxidation of methane by archaea in lake sediments 

      Su, Guangyi; Zopfi, Jakob; Yao, Haoyi; Steinle, Lea; Niemann, Helge; Lehmann, Moritz F (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-11-04)
      Anaerobic oxidation of methane (AOM) by methanotrophic archaea is an important sink of this greenhouse gas in marine sediments. However, evidence for AOM in freshwater habitats is rare, and little is known about the pathways, electron acceptors, and microbes involved. Here, we show that AOM occurs in anoxic sediments of a sulfate‐rich lake in southern Switzerland (Lake Cadagno). Combined AOM‐rate ...