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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Predation on passerine nests in hedges: the impact of nest placement, hedge structure, season and predators.
Auteurs :	Andreas Barkow, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (126(4) 2005)
Article en page(s) :	346-352
Résumé :	In a field study in Germany, predation caused 54% of songbird cup nest losses in hedges. The predation rate remained almost constant among three years. In Blackbird, Song Thrush and Dunnock nest losses were three times higher than in Chiffchaff, Common Whitethroat and Garden Warbler. Species that placed nests higher in hedges suffered more from predation. In the Yellowhammer, late broods were more successful compared to the first breeding attempt, when 50% of the nests were built on the ground. Most nests (58%) were found in May, and 67% of all depredated nests were recorded in this month. The rate of nest predation decreased from April to mid June, but increased again afterwards. In wide hedges artificial nests baited with quail eggs suffered less from predation than nests in smaller hedges. Predation rate increased with the height of hedges and surrounding vegetation as well as with the density of woods in the hedges. Magpie (62% of all nests with camera in April and May) and Jay (52% in June and July) were identified as the main predators. Losses of artificial nests were neither correlated with breeding bird density nor with nesting of Magpies in a particular hedge. Habitat selection and foraging behaviour of Magpie and Jay are discussed with respect to the observed patterns of predation.

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