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Related Experiment Video

Updated: May 29, 2026

Methods for Image-based Surveys of Benthic Macroinvertebrates and Their Habitat Exemplified by the Drop Camera Survey for the Atlantic Sea Scallop
07:43

Methods for Image-based Surveys of Benthic Macroinvertebrates and Their Habitat Exemplified by the Drop Camera Survey for the Atlantic Sea Scallop

Published on: July 2, 2018

Sedimentation patterns caused by scallop dredging in a physically dynamic environment.

A C Dale1, P Boulcott, T J Sherwin

  • 1Scottish Association for Marine Science, Scottish Marine Institute, Oban, Argyll PA37 1QA, Scotland, UK. Andrew.Dale@sams.ac.uk

Marine Pollution Bulletin
|September 20, 2011
PubMed
Summary
This summary is machine-generated.

Scallop dredging may impact nearby rocky reefs through sediment disturbance. The primary risk comes from settling sand particles within tens of meters of dredge tracks, but overall impacts are minimal in this dispersive area.

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A Flow-through Exposure System for Evaluating Suspended Sediments Effects on Aquatic Life
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A Flow-through Exposure System for Evaluating Suspended Sediments Effects on Aquatic Life

Published on: January 9, 2017

Area of Science:

  • Marine ecology
  • Oceanography
  • Environmental science

Background:

  • Scallop dredging occurs near sensitive rocky reef habitats in the Firth of Lorn, Scotland.
  • Concerns exist regarding the potential impact of disturbed sediment on reef communities.

Purpose of the Study:

  • To model sediment transport and settling from scallop dredging.
  • To assess the risk posed to nearby reef habitats.

Main Methods:

  • A particle-tracking model was used to simulate sediment transport at near-field and far-field scales.
  • Near-field model focused on sand/gravel sediment under steady current.
  • Far-field model tracked silt particles in a regional, tidally-driven flow model.

Main Results:

  • The main sedimentary risk to reefs is from settling sand particles when dredging is within tens of meters.
  • Silt particles pose a lower risk due to their longer suspension and the environment's high dispersion.
  • Low-intensity dredging is unlikely to cause significant long-term impacts on suspended silt.

Conclusions:

  • Scallop dredging poses a localized sedimentary risk to reefs primarily from sand.
  • The highly dispersive nature of the Firth of Lorn mitigates widespread siltation impacts.
  • Current dredging intensities are unlikely to cause significant long-term harm to reef ecosystems.