La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Impact of imprinting and pair-bond on first breeding of tree-nesting Peregrines Falco peregrinus
Auteurs :	Paul Soemmer, Auteur ; Wolfgang Kirmse, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (134(2) 2013)
Article en page(s) :	137-141
Résumé :	A project of the "Arbeitskreis Wanderfalkenschutz", aimed at the reintroduction of tree-nesting Peregrines, was run over 20 years and led to 34 occupied tree-nesting territories until 2012 within the lowland forests of north-eastern Germany. Systematic checks of individual codes and colour rings with telescopes at most of the breeding sites revealed the strong influence of imprinting of Peregrines on a certain nest type and explains their later choice of own nest-site type for breeding, especially concerning tree-nesting. Peregrines having fledged from cliffs and buildings never chose nest-sites on trees unless they were attracted by a mate fledged from and imprinted on a tree-nest. This happened in four cases, what in general may occur only in close contact to a tree-nesting population. The nest-type chosen at the first breeding attempt is maintained life-long. Individuals fledged on tree-nests with contact to Peregrines on buildings and cliffs tended to change the nest-site type at a rate of 41%, but only 2% of birds fledged from cliffs and buildings chose tree-nests. This asymmetry hinders a faster spread of tree-nesting over the lowland forests, especially when nest-boxes on high buildings attract individuals.

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