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ICES Journal of Marine Science: Journal du Conseil 1994 51(4):355-358; doi:10.1006/jmsc.1994.1037
© 1994 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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The 1989 German Bight invasion of Muggiaea atlantica

Wulf Greve

Biologische Anstalt Helgoland Notkestraße 31, D-22607 Hamburg, Germany

In July 1989 a population of Muggiaea atlantica invaded the German Bight where it reached abundances of up to 500 colonies m–3, becoming a key population of great impact on the ecosystem. Predation on small copepods caused a lowering in the grazing pressure on phytoplankton, enabling the growth of the algal populations and a reduction of phosphates.

Keywords: Siphonophore, invasion, predator control, top-down control, Helgoland Roads, German Bight, North Sea, systems ecology

Received 24 January 1994; accepted 3 June 1994.


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