Hydrobiologia

, Volume 441, Issue 1, pp 173–183

Seabed photography, environmental assessment and evidence for deep-water trawling on the continental margin west of the Hebrides

  • J. M. Roberts
  • S. M. Harvey
  • P. A. Lamont
  • J. D. Gage
  • J. D. Humphery
Article

Abstract

A photographic survey in 1998 of the seabed along depth transects from 700 to 1300 m across the N.E. Atlantic continental slope off north-west Scotland shows clear depth-related change in sediment type and megabenthic community in an environment where biological communities and species distributions are poorly known. Small-scale features, such as trawl marks and dense fields of xenophyophores, were resolved that may have remained unknown using conventional sampling or lower resolution imaging techniques. Because xenophyophores accumulate barite, a constituent of some drilling muds, their local-scale occurrences will be important to baseline environmental survey prior to hydrocarbon prospecting in deep water. Our results indicate that deep-sea trawling is physically impacting the seabed to depths of more than 1000 m. The persistence and biological consequence of this impact is unknown, but may depend on sediment type and natural physical disturbance. Comparison with similar seabed photographs taken from a neighbouring area in 1988, which show a high incidence of trawl marks, indicates that such impacts have been taking place over at least 10 years.

shelf edge hydrocarbon exploration environmental impact assessment trawl scars xenophyophores Atlantic Frontier fishing impacts 

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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • J. M. Roberts
    • 1
  • S. M. Harvey
    • 2
  • P. A. Lamont
    • 1
  • J. D. Gage
    • 1
  • J. D. Humphery
    • 3
  1. 1.Dunstaffnage Marine LaboratoryScottish Association for Marine ScienceOban, ArgyllU.K.
  2. 2.Dunstaffnage Marine LaboratoryCentre for Coastal and Marine SciencesOban, ArgyllU.K.
  3. 3.Proudman Oceanographic Laboratory, Bidston ObservatoryCentre for Coastal and Marine SciencesBirkenhead, WirralU.K.

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