In: Threatened Biodiversity in the German North and Baltic Seas: Sensitivities towards Human Activities and the Effects of Climate Change. , ed. by Narberhaus, I., Krause, J. and Bernitt, U. Naturschutz und Biologische Vielfalt, 116 . Federal Agency for Nature Conservation, Bonn, Germany, pp. 27-41. ISBN 978-3-7843-4017-3