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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Colour marking and radio tracking of Common Cranes Grus grus in Germany and Europe - an overview
Auteurs :	Guenter Nowald, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (131(2) 2010)
Article en page(s) :	111-116
Résumé :	In Europe, a total of 3,067 Common Cranes was marked with tricoloured individual ring codes in accordance with the European Crane Banding Group. In addition, another 35 country codes were used. The new ELSA rings are even more effective for resightings of older birds. Based on the observation of colour markings the oldest bird aged 19.7 years. Besides, issues on the reproduction biology, choice of resting sites and stopover length are investigated by the help of resightings of colour-ringed and radio-tagged birds. Some results are presented in this review.For example, from the end of June until the beginning of August, crane families from Mecklenburg-Western Pomerania utilized territories with an average size of 69.7 ha (at maximum 131.8 ha; Core-Convex-Polygon-method). The choice of resting sites corresponds to the course of the flyway and the stopover length which usually lasts much longer in autumn than in spring (i. e. Laguna de Gallocanta, NE Spain, in average 12.7 days in autumn and 3.9 days in spring). Information about the preference of flyways in relation to the origin of single cranes and the choice and tradition using habitats during winter is compiled, in particular regarding marked cranes from Estonia, which are using all three flyways.

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