La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Chick shelters did not prevent raptor predation on chicks in a mixed Common Tern Sterna hirundo and Black-headed Gull Larus ridibundus colony in Slovenia
Auteurs :	Damijan Denac, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (127(3) 2006)
Article en page(s) :	187-191
Résumé :	Predation is a serious threat to colonial waterbirds, especially colonies for conservation of threatened species. While the effectiveness of a simple antipredator measure, the placing of chick shelters, has been tested against gulls, there are few studies on their effectiveness against raptor predation. The quantified protective effect of chick shelters against raptor predation in a mixed Common Tern and Black-headed Gull colony is now reported. Three identical artificial breeding rafts were equipped with different numbers of chick shelters. All chicks were observed to be subject to predation by Goshawk Accipiter gentilis, with an intensity independent of the presence or number of chick shelters, indicating that they offered no protective function. More sophisticated protective measures are thus needed to control raptor predation in an managed colony.

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