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Reactive oxygen species affect the potential for mineralization processes in permeable intertidal flats

Author

Listed:
  • Marit R. Erk

    (Max Planck Institute for Marine Microbiology
    Utrecht University)

  • Olivia M. Bourceau

    (Max Planck Institute for Marine Microbiology)

  • Chyrene Moncada

    (Max Planck Institute for Marine Microbiology)

  • Subhajit Basu

    (Max Planck Institute for Marine Microbiology
    University of Petroleum and Energy Studies (UPES))

  • Colleen M. Hansel

    (Woods Hole Oceanographic Institution)

  • Dirk Beer

    (Max Planck Institute for Marine Microbiology)

Abstract

Intertidal permeable sediments are crucial sites of organic matter remineralization. These sediments likely have a large capacity to produce reactive oxygen species (ROS) because of shifting oxic-anoxic interfaces and intense iron-sulfur cycling. Here, we show that high concentrations of the ROS hydrogen peroxide are present in intertidal sediments using microsensors, and chemiluminescent analysis on extracted porewater. We furthermore investigate the effect of ROS on potential rates of microbial degradation processes in intertidal surface sediments after transient oxygenation, using slurries that transitioned from oxic to anoxic conditions. Enzymatic removal of ROS strongly increases rates of aerobic respiration, sulfate reduction and hydrogen accumulation. We conclude that ROS are formed in sediments, and subsequently moderate microbial mineralization process rates. Although sulfate reduction is completely inhibited in the oxic period, it resumes immediately upon anoxia. This study demonstrates the strong effects of ROS and transient oxygenation on the biogeochemistry of intertidal sediments.

Suggested Citation

  • Marit R. Erk & Olivia M. Bourceau & Chyrene Moncada & Subhajit Basu & Colleen M. Hansel & Dirk Beer, 2023. "Reactive oxygen species affect the potential for mineralization processes in permeable intertidal flats," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-35818-4
    DOI: 10.1038/s41467-023-35818-4
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