La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Winter diet of the Long-eared Owl Asio otus in Denmark
Auteurs :	Annelise Jensen, Auteur ; Birger Jensen, Auteur
Type de document :	Article
Dans :	Dansk Ornitologisk Forenings Tidsskrift (92(4) 1998)
Article en page(s) :	333-338
Langues:	Anglais
Résumé :	A survey is given on the winter diet of the Long-eared owl in Denmark, based on a total of 17972 prey specimens from pellets collected during November-March at 20 localities (Fig. 1). This composite material was put together from the literature, personal communication with colleagues and the authors' own investigations. The percentage by number of prey species/groups is shown in Fig. 2 and 3. Voles Microtus agrestis and M. arvalis dominated (Fig. 2 and 3A), followed by wood mice Apodemus sylvaticus and/or A. flavicollis (Fig. 3A). Other vote species found were bank vole Clethrionomys glareolus and a few water votes Arvicola terrestris (Fig. 3B). Among other mice species (Fig. 3B), a number of harvest mice Micromys minutus and a few house mice Mus musculus and brown rats Rattus norvegicus were found. Birds occurred regularly but mostly in small numbers (Fig. 3C), while shrews (Sorex araneus, S. minutus and very few Neomysfodiens) generally constituted less than 1% of the prey (Fig. 3D). The variation in the composition of the diet between different winter seasons and localities is discussed, also in relation to the possibility of using owl pellets for monitoring small mammals.

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