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A supplement to the amphipod (Crustacea) species inventory of Helgoland (German Bight, North Sea): indication of rapid recent change

Published online by Cambridge University Press:  12 May 2011

Jan Beermann  and
Heinz-Dieter Franke
Jan Beermann*
Affiliation:
Alfred Wegener Institute for Polar and Marine Research, Biologische Anstalt Helgoland, PO Box 180, 27483 Helgoland, Germany
Heinz-Dieter Franke
Affiliation:
Alfred Wegener Institute for Polar and Marine Research, Biologische Anstalt Helgoland, PO Box 180, 27483 Helgoland, Germany
*
Correspondence should be addressed to: J. Beermann, Alfred Wegener Institute for Polar and Marine Research, Biologische Anstalt Helgoland, PO Box 180, 27483 Helgoland, Germany email: Jan.Beermann@awi.de
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Abstract

The surroundings of the rocky island of Helgoland (German Bight, south-western North Sea) are one of the best-studied sites in European seas with species occurrence data available for nearly 150 years. As the area is strongly affected by global change (e.g. increase in mean sea surface temperature at Helgoland by 1.67°C since 1962), ecosystem structure and function are expected to change more than those of average marine systems. The paper presents a supplement to the local amphipod species inventory (5 nautical miles around the island). At least seven species of this ecologically important taxon seem to have newly established themselves at Helgoland since the late 1980s: Ampelisca typica, Amphilochus brunneus, Caprella mutica, Cheirocratus assimilis, Monocorophium acherusicum, Orchestia mediterranea and Orchomenella crenata. Most of them are not only new for the Helgoland area, but also for the German Bight; and two species (Amphilochus brunneus and Orchomenella crenata) are even new to the North Sea as a whole. Out of the seven new species, one (Caprella mutica) is a neozoon from the north-western Pacific. The other six species show clear warm water affinities (oceanic–Lusitanian species) which suggest a recent range expansion in the context of climate warming. The establishment of an increasing number of species formerly probably absent from the area does not seem to be compensated by losses of species, so that local species diversity is expected to increase.

Keywords

AmphipodaHelgolandGerman BightNorth Seaclimate warmingnon-indigenous species
Type
Research Article
Information
Marine Biodiversity Records , Volume 4 , December 2011 , e41
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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