Composition of the epibenthic decapod crustacean megafauna of the German Exclusive Economic Zone: comparison and analysis of past and recent surveys

in Crustaceana
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This study comprises and compares epibenthic samples of the marine crustacean decapod megafauna, taken with a beam trawl at numerous stations in the German Exclusive Economic Zone of the North Sea in the years 1987, 1990, 2007 and 2013. All decapod crustacean species were recorded quantitatively. An overview of the decapod faunal composition with respect to changes in space, species and abundance with time is given. A time-dependent decrease of rare and often northern species at the research area is obvious, as a result of an increase of some dominant species concentrating in coastal areas. In 2013, a more uniform species composition seems to have developed. Decapod species and abundance depletions may be influenced by many factors, among them also climate change and fisheries.

Composition of the epibenthic decapod crustacean megafauna of the German Exclusive Economic Zone: comparison and analysis of past and recent surveys

in Crustaceana

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References

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Figures

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    Research area in the German Exclusive Economic Zone. Above, the stations of the 1987 and 1990 cruises are shown. The stations of the cruises 2007 and 2013 are depicted below.

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    Abundance (individuals per station) of the pink shrimp Crangon allmanni Kinahan, 1860 in the research area in relation to sampling years. The years 1987 and 1990 were combined due to temporal proximity and different spatial coverage of sampling stations. Maps were generated with ArcGIS 10.1.

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    Species numbers (decapods only) per station within the research area in relation to sampling years. The years 1987 and 1990 were put together due to temporal proximity and different spatial coverage of sampling stations. Maps were generated with ArcGIS 10.1.

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    MDS plot based on the Bray-Curtis similarity measure. Points and circles depict samples. Distances based on the 2nd root transformed abundance data of decapod crustaceans in each sample are shown.

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    MDS plot of 1987/90: square-root transformed decapod abundances analysed with Bray-Curtis similarity measure, assigning clusters 1 and 2 to the station map.

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    MDS plot of 2007: square-root transformed decapod abundances analysed with Bray-Curtis similarity measure, assigning clusters 1 and 2 to the station map.

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    MDS plot of 2013: square-root transformed decapod abundances analysed with Bray-Curtis similarity measure. No obvious clusters.

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