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Titre :	Defence behaviour of meadow birds against avian predators
Auteurs :	Jann Wuebbenhorst, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (121(1) 2000)
Article en page(s) :	39-44
Résumé :	The defence behaviour of meadow birds against avian predators was investigated in a pasture area in Lower Saxony, NW-Germany, where meadow birds (especially Lapwing Vanellus vanellus. Black-tailed Godwit Limosa limosa and Redshank Tringa totantus) are comparatively abundant. During the nesting period, when most of the birds were incubating or caring for their offspring, the defence flights usually were very aggressive and successful. The predators (Carrion Crows Corvus corone and Marsh Harriers Circus aeruginosus) were chased away from the vicinity of the nests in 92% of the observed cases. Black-tailed Godwit and Lapwing were especially bold defenders. The attacks were usually carried out by at least two birds at the same time. In nearly half of the cases there were more than 3 birds, and in one third of the cases at least two species were involved. The intensity of defence reactions decreased rapidly after most of the breeding pairs had lost their clutches or young (many clutches were trampled by the cattle). It is suggested that there might be a relation between abundance of meadow birds in an area and the intensity of their defence behaviour. The frequency of Carrion Crows in the habitat of meadow birds and the effects of defence behaviour on breeding success (of the active defenders and other species) are discussed.

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