Habitat-Specific Effects of Fishing Disturbance on Benthic Species Richness in Marine Soft Sediments

P.D. van Denderen, N.T. Hintzen, A.D. Rijnsdorp, P. Ruardij, T. van Kooten

Research output: Contribution to journalArticleAcademicpeer-review

28 Citations (Scopus)

Abstract

Around the globe, marine soft sediments on continental shelves are affected by bottom trawl fisheries. In this study, we explore the effect of this widespread anthropogenic disturbance on the species richness of a benthic ecosystem, along a gradient of bottom trawling intensities. We use data from 80 annually sampled benthic stations in the Dutch part of the North Sea, over a period of 6 years. Trawl disturbance intensity at each sampled location was reconstructed from satellite tracking of fishing vessels. Using a structural equation model, we studied how trawl disturbance intensity relates to benthic species richness, and how the relationship is mediated by total benthic biomass, primary productivity, water depth, and median sediment grain size. Our results show a negative relationship between trawling intensity and species richness. Richness is also negatively related to sediment grain size and primary productivity, and positively related to biomass. Further analysis of our data shows that the negative effects of trawling on richness are limited to relatively species-rich, deep areas with fine sediments. We find no effect of bottom trawling on species richness in shallow areas with coarse bottoms. These condition-dependent effects of trawling suggest that protection of benthic richness might best be achieved by reducing trawling intensity in a strategically chosen fraction of space.
Original languageEnglish
Pages (from-to)1216-1226
JournalEcosystems
Volume17
Issue number7
DOIs
Publication statusPublished - 2014

Keywords

  • pleuronectes-platessa l.
  • southern north-sea
  • sole solea-solea
  • trawl disturbance
  • ecosystem-model
  • productivity
  • diversity
  • communities
  • bottom
  • hypothesis

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