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Microbial methane cycling in a landfill on a decadal time scale

Author

Listed:
  • Daniel S. Grégoire

    (University of Waterloo
    Carleton University)

  • Nikhil A. George

    (University of Waterloo)

  • Laura A. Hug

    (University of Waterloo)

Abstract

Landfills generate outsized environmental footprints due to microbial degradation of organic matter in municipal solid waste, which produces the potent greenhouse gas methane. With global solid waste production predicted to increase substantially in the next few decades, there is a pressing need to better understand the temporal dynamics of biogeochemical processes that control methane cycling in landfills. Here, we use metagenomic approaches to characterize microbial methane cycling in waste that was landfilled over 39 years. Our analyses indicate that newer waste supports more diverse communities with similar composition compared to older waste, which contains lower diversity and more varied communities. Older waste contains primarily autotrophic organisms with versatile redox metabolisms, whereas newer waste is dominated by anaerobic fermenters. Methane-producing microbes are more abundant, diverse, and metabolically versatile in new waste compared to old waste. Our findings indicate that predictive models for methane emission in landfills overlook methane oxidation in the absence of oxygen, as well as certain microbial lineages that can potentially contribute to methane sinks in diverse habitats.

Suggested Citation

  • Daniel S. Grégoire & Nikhil A. George & Laura A. Hug, 2023. "Microbial methane cycling in a landfill on a decadal time scale," Nature Communications, Nature, vol. 14(1), pages 1-18, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-43129-x
    DOI: 10.1038/s41467-023-43129-x
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    References listed on IDEAS

    as
    1. Mohamed F. Haroon & Shihu Hu & Ying Shi & Michael Imelfort & Jurg Keller & Philip Hugenholtz & Zhiguo Yuan & Gene W. Tyson, 2013. "Anaerobic oxidation of methane coupled to nitrate reduction in a novel archaeal lineage," Nature, Nature, vol. 500(7464), pages 567-570, August.
    2. Mohamed F. Haroon & Shihu Hu & Ying Shi & Michael Imelfort & Jurg Keller & Philip Hugenholtz & Zhiguo Yuan & Gene W. Tyson, 2013. "Erratum: Anaerobic oxidation of methane coupled to nitrate reduction in a novel archaeal lineage," Nature, Nature, vol. 501(7468), pages 578-578, September.
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