La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Population and range expansion of forest boreal owls (Glaucidium passerinum, Aegolius funereus, Strix uralensis, Strix nebulosa) in East-Central Europe
Auteurs :	Grzegorz Kopij, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (132(4) 2011)
Article en page(s) :	207-214
Résumé :	There are four European owl species restricted basically to the boreal zone (taiga and mountain coniferous forests): Pygmy Owl Glaucidium passerinum, Ural Owl Strix uralensis, Great Grey Owl Strix nebulosa and Tengmalm's Owl Aegolius funereus. They are confined to the north (mostly to Belarus, Lithuania and Latvia) and to the south (mainly Sudety and Carpathians mountains) in East-Central Europe. All these species were regarded as rare until the end of the 1980s. During the years 1990-2007 their numbers have increased substantially in many regions. It is not known to what extend these changes reflect a real population increase or the increase of ornithologists' activities in owl research. The increasing tendency is however evident for all four species in smaller sample plots distributed over whole East-Central Europe and in well-studied larger areas. These changes can be explained as a result of possible decline of their potential competitors and/or as a consequence of population expansion of these owl species from their Fennoscandian and Russian strongholds.

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