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Peer-reviewedCC BYScience Advances

ANME-2a perform methane oxidation in brackish coastal sediments via multiple pathways

  • Robin Klomp1,2
  • Anna J. Wallenius1,3
  • Merijn A. W. Schutgens1
  • Theo van Alen1
  • Thomas Röckmann4
  • Mike S. M. Jetten1
  • Caroline P. Slomp1,2
4 affiliations
  1. 1Department of Microbiology, Radboud Institute for Biological and Environmental Sciences, Radboud University, Heyendaalseweg 135, 6525AJ Nijmegen, Netherlands.
  2. 2Department of Earth Sciences, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, Netherlands.
  3. 3Stockholm University Baltic Sea Center, Svante Arrheniusväg 20F, Stockholm, Sweden.
  4. 4Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Princetonplein 5, 3584CC Utrecht, Netherlands.
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Abstract

Methane is a powerful greenhouse gas. Typically, a large fraction of methane formed in coastal sediments is removed via anaerobic oxidation of methane (AOM). Here, we demonstrate the potential for a range of AOM pathways in brackish coastal sediments by ANME-2a archaea. At our study site, geochemical profiles indicate that AOM is primarily restricted to a shallow, metal oxide-rich sulfate-methane transition zone (SMTZ). ANME-2a were the sole methanotrophs detected, and metatranscriptomics showed the highest expression levels of the ANME-2a genes in the SMTZ. AOM activity was observed in sediment incubations with various electron acceptors, including sulfate, metal oxides, and the organic matter analog graphene oxide. Highest potential rates were observed in sediments from below the SMTZ, pointing toward fast stimulation of the deeper methanotrophic community when alleviating the electron acceptor limitation. The variety of AOM pathways and persistence of methanotrophs below the SMTZ likely contribute to the resilience of the microbial methane filter in brackish coastal sediments.

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Cite

BibTeXRIS
BibTeX
@article{klomp2026anme2a,
  title = {{ANME-2a perform methane oxidation in brackish coastal sediments via multiple pathways}},
  author = {Robin Klomp and Anna J. Wallenius and Merijn A. W. Schutgens and Theo van Alen and Thomas Röckmann and Mike S. M. Jetten and Caroline P. Slomp},
  journal = {Science Advances},
  year = {2026},
  month = oct,
  doi = {10.1126/sciadv.aei5868},
  url = {https://www.science.org/doi/abs/10.1126/sciadv.aei5868},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - ANME-2a perform methane oxidation in brackish coastal sediments via multiple pathways
AU  - Robin Klomp
AU  - Anna J. Wallenius
AU  - Merijn A. W. Schutgens
AU  - Theo van Alen
AU  - Thomas Röckmann
AU  - Mike S. M. Jetten
AU  - Caroline P. Slomp
PY  - 2026
DA  - 2026/10/30
JO  - Science Advances
DO  - 10.1126/sciadv.aei5868
UR  - https://www.science.org/doi/abs/10.1126/sciadv.aei5868
AB  - Methane is a powerful greenhouse gas. Typically, a large fraction of methane formed in coastal sediments is removed via anaerobic oxidation of methane (AOM). Here, we demonstrate the potential for a range of AOM pathways in brackish coastal sediments by ANME-2a archaea. At our study site, geochemical profiles indicate that AOM is primarily restricted to a shallow, metal oxide-rich sulfate-methane transition zone (SMTZ). ANME-2a were the sole methanotrophs detected, and metatranscriptomics showed the highest expression levels of the ANME-2a genes in the SMTZ. AOM activity was observed in sediment incubations with various electron acceptors, including sulfate, metal oxides, and the organic matter analog graphene oxide. Highest potential rates were observed in sediments from below the SMTZ, pointing toward fast stimulation of the deeper methanotrophic community when alleviating the electron acceptor limitation. The variety of AOM pathways and persistence of methanotrophs below the SMTZ likely contribute to the resilience of the microbial methane filter in brackish coastal sediments.
SN  - 2375-2548
ER  -