La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Do territorial and non-breeding Australian Magpies Gymnorhina tibicen influence the local movements of rural birds in New Zealand?
Auteurs :	D. Morgan, Auteur ; J. R. Waas, Auteur ; J. Innes, Auteur
Type de document :	Article
Dans :	Ibis (148(2) APR 2006)
Article en page(s) :	330-342
Résumé :	Australian Magpies Gymnorhina tibicen sometimes attack and kill other birds in New Zealand. Here we assess how Australian Magpies influence the local distribution of other birds in New Zealand and identify the members of an Australian Magpie population that display the most agonistic acts. We conducted regular observations on six territorial breeding groups and three non-breeding flocks of Australian Magpies for 1 year to determine (1) if other birds avoid flying or foraging close to Australian Magpies, (2) the proportion of passing birds that are attacked and (3) which social subunits of the Australian Magpie population are most aggressive. In comparison with adjacent Magpie-free control areas, significantly fewer birds of a range of species (e.g. Common Blackbird Turdus merula, Skylark Alauda arvensis, Yellowhammer Emberiza citrinella) foraged close (i.e.

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