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Bioturbation in the hadal zone

Author

Listed:
  • Jussi Hovikoski

    (Geological Survey of Finland (GTK))

  • Joonas J. Virtasalo

    (Geological Survey of Finland (GTK))

  • Andreas Wetzel

    (Universität Basel)

  • Mishelle Muthre

    (University of Innsbruck)

  • Michael Strasser

    (University of Innsbruck)

  • Jean-Noel Proust

    (University of Rennes)

  • Ken Ikehara

    (Tsukuba Central 7)

Abstract

The hadal zone, >6 km deep, remains one of the least understood ecosystems on Earth. We address bioturbational structures in sediment cores from depths exceeding 7.5 km, collected during the IODP Expedition 386 in the Japan Trench. Micro-CT imaging on 20 core sections allowed to identify biogenic sedimentary structures (incipient trace fossils) and their colonization successions within gravity flow deposits. Their frequency, and consequent changes in substrate consistency, oxygenation and organic matter delivery and remineralization controlled the endobenthic colonization. The gravity-flow beds show recurring bioturbation successions: The initial colonization is characterized by deposit-feeding structures such as Phycosiphon, Nereites and Artichnus generating typically 20 cm thick intensively bioturbated fabrics. The final colonization stage comprises slender spiral, lobate and deeply penetrating straight and ramifying burrow systems such as Gyrolithes, Pilichnus and Trichichnus, interpreted to include burrows of microbe farming and chemosymbiotic invertebrates. The main factor precluding colonization is soupy substrate. Organic matter degradation and post-event upward expansion of the anoxic zone drive the change from deposit feeding to microbe-dependent feeding strategies.

Suggested Citation

  • Jussi Hovikoski & Joonas J. Virtasalo & Andreas Wetzel & Mishelle Muthre & Michael Strasser & Jean-Noel Proust & Ken Ikehara, 2025. "Bioturbation in the hadal zone," Nature Communications, Nature, vol. 16(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-56627-x
    DOI: 10.1038/s41467-025-56627-x
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    References listed on IDEAS

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    4. Rui Bao & Michael Strasser & Ann P. McNichol & Negar Haghipour & Cameron McIntyre & Gerold Wefer & Timothy I. Eglinton, 2018. "Tectonically-triggered sediment and carbon export to the Hadal zone," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
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