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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Moult of primaries and secondaries in the Common Crane Grus grus
Auteurs :	Eberhard Henne, Auteur ; Beate Blahy-Henne, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (131(2) 2010)
Article en page(s) :	107-110
Résumé :	In Common Crane, the moult of primaries and secondaries is supposed to be a hormonal process regulated by external factors which lead to the complete loss of all wing feathers within some hours (two days at maximum). According to our observations, moult of immature birds starts between the end of April and the first decade of May, with chick-guarding adults following from the second decade of May onwards (sometimes until the third decade of June). The two birds of a breeding pair rarely moult simultaneously. Out of 20 immature birds, 14 moulted wing feathers every third year, whereas four did so every two and two every four years. Half of the birds moulting after two years showed incomplete moult, i. e. some of the old flight feathers remained. It is assumed that loss or damage of feathers may induce advanced moult. The social behaviour of moulting cranes changes completely. They become very shy and the dominance structure within the group changes as well. Within five to six weeks the new flight feathers are fully grown. The birds reach their ability to fly one or two weeks after completed growth of the wing quills.During the phase of moulting the cranes on average lose a quarter of their body weight. Nearly 15% of moulting birds get lost due to predation, diseases or parasites. The strict protection of moulting places, silence, and undisturbed surroundings are highly important.

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