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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Phenology, general behaviour, and breeding output of Cranes Grus grus in Denmark
Auteurs :	Jesper Tofft, Auteur
Type de document :	Article
Dans :	Dansk Ornitologisk Forenings Tidsskrift (101(4) 2007)
Article en page(s) :	102-108
Langues:	Anglais
Résumé :	The Danish Crane populationen increased from 4-5 pairs in 1990 to c. 60 pairs in 2006, and information on the breeding biology (habitat, behaviour, young production) were collected by the Danish Ornithological Society in parallel with annual monitoring work during 1998-2006. Three quarters of the population breed in two regions in opposite ends of the country, northern Jutland and Bornholm. In the former region Cranes breed in nutritient-poor, open areas, in other parts of the country in more closed habitats, often on richer soil. Spring arrival to southern Jutland and Bornholm is in early March, to northern Jutland c. 2 weeks later, but may vary 2 weeks in all regions depending on the weather. Egg laying usually occurs during the first weeks of April. Overall, young production in 280 pair-seasons was 0.93, and in 212 successful pair-seasons 1.58. However, pairs on Bornholm were considerably more productive than pairs in north Jutland (Table 2). In autumn, adult and immature Cranes congregate to spend the night at common roosts. Only one such roost is known in Denmark, Vejlerne in north Jutland, although two others apparently are in the process of becoming established. In Vejlerne up to 150 Cranes are seen before they leave the country in October-November. The Cranes on Bornholm already leave in mid-October.

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