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Area of Science:

  • Deep-sea ecology
  • Marine biology
  • Environmental science

Background:

  • Abyssal polymetallic nodule exploitation is imminent, raising concerns about ecosystem impacts.
  • Deep-sea ecosystems, particularly nodule-sediment interfaces, host high biodiversity but remain poorly understood.
  • The long-term effects and recovery potential of mining disturbances on these remote habitats are unclear.

Purpose of the Study:

  • To assess the long-term effects of simulated mining disturbance on abyssal megabenthos.
  • To understand the timescale of ecosystem recovery following deep-sea mining impacts.
  • To infer potential consequences of polymetallic nodule mining in the Clarion-Clipperton Zone based on experimental data.

Main Methods:

  • Analysis of seafloor photo-mosaics from the DISturbance and reCOLonization experiment (DISCOL) in the Peru Basin.
  • Long-term monitoring (26 years post-disturbance) of megabenthos community structure.
  • Comparison of disturbed versus undisturbed areas to evaluate ecological changes.

Main Results:

  • Simulated mining impacts were still evident 26 years after the DISCOL experiment.
  • Suspension-feeder abundance remained significantly reduced in disturbed areas.
  • Deposit-feeder presence normalized, but heterogeneity diversity was lower, and faunal composition differed significantly across disturbance levels.

Conclusions:

  • Deep-sea mining disturbances can have lasting impacts on abyssal ecosystems, persisting for over two decades.
  • Recovery of some faunal groups may occur, but overall ecosystem function and biodiversity may be irreversibly altered.
  • Potential impacts of polymetallic nodule mining in the Clarion-Clipperton Zone could be severe and long-lasting, potentially exceeding current expectations.