La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Diet composition of Common Kestrels Falco tinnunculus and Long-eared Owls Asio otus coexisting in an urban environment (2009)
Auteurs :	Jan Riegert, Auteur ; Matej Loevy, Auteur ; Drahomira Fainova, Auteur
Type de document :	Article
Dans :	Ornis Fennica (86(4) 2009)
Article en page(s) :	123-130
Langues:	Anglais
Résumé :	We studied the dietary composition of urban populations of Common Kestrels (Falco tinnunculus) and Long-eared Owls (Asio otus) under fluctuating vole abundance in Ceske Budejovice during 2002-2005. Common Voles were the dominant prey. In poor vole years, the dietary proportion of alternative prey increased in both species. Long-eared Owls fed more on mice and related rodents, whereas the Common Kestrels' diet shifted to insects. The different alternative diets may be due to species-specific daily activity, hunting techniques and/or hunting habitats. Furthemore, we examined the possible relationship between the distance from a nest to the city centre and the proportion of voles in the diet. The Kestrel diet was not markedly influenced by distance, but for Long-eared Owls an increasing distance was associated with an increasing dietary proportion of voles.

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