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Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod
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Ploughing the deep sea floor.

Pere Puig1, Miquel Canals, Joan B Company

  • 1Marine Sciences Institute, CSIC, E-08003 Barcelona, Spain. ppuig@icm.csic.es

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Summary

Bottom trawling reshapes deep seafloor landscapes, smoothing complex terrains over large areas. This fishing method is increasingly altering the deep sea floor

Area of Science:

  • Marine geology
  • Deep-sea ecology
  • Fisheries science

Background:

  • Bottom trawling is a widespread fishing method impacting marine ecosystems.
  • Previous research focused on direct biological effects and coastal seabed alterations.
  • The physical impacts of trawling on deep-sea environments remain less understood.

Purpose of the Study:

  • To investigate the large-scale physical modifications of the deep seafloor by bottom trawling.
  • To assess how trawling affects the morphology and complexity of the seabed on upper continental slopes.
  • To understand the role of industrial fishing in deep seascape evolution.

Main Methods:

  • Analysis of high-resolution seafloor relief maps.
  • Assessment of sediment displacement and removal in trawled areas.

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  • Comparison of seafloor morphology in fished versus unfished deep-sea regions.

    • Main Results:

    • Bottom trawling gradually smooths the deep seafloor morphology over large spatial scales.
    • Trawling leads to sediment displacement and removal, reducing seabed complexity.
    • The physical impact of trawling on deep-sea landscapes is significant and widespread.

    Conclusions:

    • Bottom trawling is a major driver of deep seascape evolution on upper continental slopes.
    • Industrialized fishing practices are significantly altering deep-sea environments globally.
    • The physical effects of deep-sea trawling may be comparable to agricultural ploughing on land.