La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Interspecific brood parasitism at Common Crane Grus grus nests
Auteurs :	Wolfgang Mewes, Auteur ; Michael Modrow, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (131(2) 2010)
Article en page(s) :	103-106
Résumé :	During routine control of Common Crane nest, mixed clutches with eggs of Greyleg Geese and Mallards were found occasionally. A first case of interspecific brook parasitism at crane nests became evident in 1987. Between 2003 and 2008 we observed three crane clutches containing. Mallard eggs and another three crane clutches consisting of Greyleg Goose eggs in the Mecklenburg Western Pomerania (NE Germany). Here we describe these incidents and present photographic documentations. In 2009 another crane clutch with one egg of a Greyleg Goose was reported in the district of Bad Doberan. It is still unknown how alien eggs get into crane nests. Usually cranes are incubating parasitic eggs and fostering the chicks, but the chicks rarely survive until fledging. In one care a crane pain incubated two Mallard eggs until hatching without having an own egg in the nest.

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