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The metazoan plankton along a meridional North Sea transect between 54° and 62°N was sampled in winter 1991, and spring and late summer 1994. Depth-integrated abundances of 65 taxa were derived per station. The effective number of species ranged between 1 and 10, indicating that the North Sea has only a few abundant metazooplankton species. Biodiversity was highest in spring and showed little difference...