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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	The development of Common Crane Grus grus resting and the influence of agriculture in the Rugen-Bock region in northeast Germany
Auteurs :	Guenter Nowald, Auteur ; Norman Donner, Auteur ; Michael Modrow, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (131(2) 2010)
Article en page(s) :	123-128
Résumé :	The number of Common Cranes resting during autumn migration in the Rugen-Bock region (Mecklenburg-Western Pomerania, NE Germany) has continued to rise steadily since the first census in 1965. With up to 70,000 individuals at peak occurrence in October the region is among the most important resting sites for cranes in Europe. The increase in numbers reflects the positive trend in population development in Sweden and Norway. To a lesser extent, cranes from Finland, the Baltic States and Poland are migrating through the region. Due to the use of more effective machines in modern agriculture harvest residuals like barley, wheat and maize have become rare on stubble fields. Besides, the acreage for maize decreased from 1983 to 2009 by more than 50%, while the area under cultivation with rape, which has no nutritional relevance for cranes and many other species, has doubled. If suitable stubble fields are not available as feeding grounds, cranes are more likely to move to fields with sprouted cereal seedlings, where they may cause partial damage to these plants. The use of artificial feeding sites has already been effective at preventing damage to seedlings and has achieved positive effects with respect to visitor direction.

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