Epibenthic biodiversity in the North Sea

Ruth Zuhlke, John Alvsvag, Ingeborg De Boois, John Cotter, Alex Ford, Hilmar Hinz, Astrid Jarre-Teichmann, Simon Jennings, Ingrid Kroncke, John Lancaster, Gerjan Piet, Philip Prince

Research output: Chapter in Book/Report/Conference proceedingChapter (peer-reviewed)peer-review


In 1999 the epibenthic fauna of the North Sea was investigated using the 3rd quarter ‘International Bottom Trawl Survey’ of five European countries. Altogether 241 stations were sampled covering 143 ICES rectangles.

The objectives of the project were (i) to analyse epibenthic diversity patterns in the North Sea, (ii) to identify the spatial distribution of faunal communities and (iii) to relate environmental factors as well as fishing effort to species diversity.

Epibenthic fauna was clearly divided between the southern North Sea and the central-northern North Sea, roughly along the 50 m depth line. The separation was based on an overall higher number of species in the central and northern North Sea and a change in the species composition from north to south.

Sessile fauna including erect, branching species like bryozoans and hydrozoans were particularly diverse along a corridor in the central-northern North Sea between 56° and 58°N, coinciding with the area between the 50 m and 100 m depth line. Cluster analysis, based on the structure of the community, confirmed the north-south gradient found for species diversity. Separation of clusters was driven to a great extent by species occurring predominantly or exclusively north of the 50 m contour line. Few species were exclusive to the south, but a number of scavenging species were found here more frequently and in higher numbers.

Depth was positively correlated with the diversity of free-living fauna, whereas the type of sediment showed no significant relationship with variations in numbers of species. Beam-trawling effort was negatively correlated with the diversity of sessile fauna.
Original languageEnglish
Title of host publicationBurning issues of North Sea ecology
Subtitle of host publicationThe 14th International Senckenberg Conference "North Sea 2000". Wilhelmshaven, Germany, 8-12 May 2000
EditorsI. Kroncke, M. Turkay, J. Sundermann
Place of PublicationStuttgart, Germany
PublisherSchweizerbart Science Publishers
ISBN (Print)9783510613281
Publication statusPublished - 2002


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