Different bottom trawl fisheries have a differential impact on the status of the North Sea seafloor habitats

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  • A.D. Rijnsdorp
    Wageningen University
  • Jan Geert Hiddink
  • P.D. van Dendren
    Technical University of Denmark, Lyngby
  • N.T. Hintzen
    Wageningen University
  • O.R. Eigaard
    Technical University of Denmark, Lyngby
  • S. Valanko
    International Council for the Exploration of the Sea, Copenhagen
  • F. Bastardie
    Technical University of Denmark, Lyngby
  • S.G. Bolam
    Cefas, Marine Climate Change Centre
  • P. Boulcott
    Marine Scotland, Marine Laboratory, Aberdeen
  • J. Egekvist
    Technical University of Denmark, Lyngby
  • C. Garcia
    Cefas, Marine Climate Change Centre
  • G. van Hoey
    ILVO, Oostende
  • P. Jonsson
    Swedish University of Agricultural Sciences
  • P. Laffargue
    Institut français de recherche pour l’exploitation de la mer (IFREMER)
  • J.R. Nielsen
    Technical University of Denmark, Lyngby
  • G.J. Piet
    Wageningen University
  • M. Skold
    Swedish University of Agricultural Sciences
  • T. van Kooten
    Wageningen University
Fisheries using bottom trawls are the most widespread source of anthropogenic physical disturbance to seafloor habitats. To mitigate such disturbances, the development of fisheries-, conservation-, and ecosystem-based management strategies requires the assessment of the impact of bottom trawling on the state of benthic biota. We explore a quantitative and mechanistic framework to assess trawling impact. Pressure and impact indicators that provide a continuous pressure–response curve are estimated at a spatial resolution of 11 min latitude and longitude (2km2) using three methods: L1 estimates the proportion of the community with a life span exceeding the time interval between trawling events; L2 estimates the decrease in median longevity in response to trawling; and population dynamic (PD) estimates the decrease in biomass in response to trawling and the recovery time. Although impact scores are correlated, PD has the best performance over a broad range of trawling intensities. Using the framework in a trawling impact assessment of ten me´tiers in the North Sea shows that muddy habitats are impacted the most and coarse habitats are impacted the least. Otter trawling for crustaceans has the highest impact, followed by otter trawling for demersal fish and beam trawling for flatfish and flyshooting. Beam trawling for brown shrimps, otter trawling for industrial fish, and dredging for molluscs have the lowest impact. Trawling is highly aggregated in core fishing grounds where the status of the seafloor is low but the catch per unit of effort (CPUE) per unit of impact is high, in contrast to peripheral grounds, where CPUE per unit of impact is low

Allweddeiriau

Iaith wreiddiolSaesneg
Tudalennau (o-i)1772-1786
CyfnodolynICES Journal of Marine Science
Cyfrol77
Rhif y cyfnodolyn5
Dyddiad ar-lein cynnar24 Ebr 2020
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - Medi 2020

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