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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	The reproduction of the Common Crane Grus grus in Germany
Auteurs :	Wolfgang Mewes, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (120(5-6) 1999)
Article en page(s) :	251-259
Résumé :	One of the reasons for the spectacular population increase of the Crane in Germany is the relatively high rate of reproduction in this country. Clutches contained on average 1.95 eggs (average of 1978-1998; n = 674). The hatching rate was 1.92 juveniles per nest. The number of juveniles lost after hatching was relatively high, about 0.7-0.8 per clutch. The average breeding success was 0.90 juveniles per breeding pair. This represents a slight decline compared to the end of the 1980s, when breeding success was 1.0 juvenile per clutch. Reasons for this decline are discussed. Between counties with breeding Cranes, breeding success ranged from 0.79 to 0.92 juveniles per breeding pair. Very little comparative material from other European countries is available. Some notes, drawn from a few random samples, indicate that breeding success in Sweden is considerably lower than in Germany. Differences in breeding habitat are considered to be the main reason. In Sweden most breeding habitats lack any undergrowth. In Germany, in contrast, most cranes breed in swampy forests. The breeding success in these territories is above average. The earlier average date of clutch initiation in Germany allows, in the case of early brood losses, for subsequent relaying (in about 50% of cases). A replacement brood is not possible in Sweden because of the late spring.

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