La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Osprey Pandion haliaetus management in Vestfold county, SE-Norway 1984-98
Auteurs :	Odd Frydenlund Steen, Auteur ; Gunnar Hansen, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (122(3-4) 2001)
Article en page(s) :	223-226
Résumé :	In Vestfold county (2.200 km2) in SE-Norway, a small group of ornithologists have monitored Osprey nests annually since 1984 (Project Osprey Vestfold). The investigations were supported by the local administration for wildlife management. Being aware of the Osprey's severe problems with nest building due to scarcity of suitable nesting trees, construction of artificial nests was initiated in autumn 1984. So far 37 natural looking nests have been erected in pines of which 19 have been accepted by Ospreys for breeding purposes. After the construction of artificial nests the population increased considerably. The production of young has fluctuated with a peak in 1991. As a result of decreased appearance of the main prey species the number of Osprey pairs in northern Vestfold decreased after 1994. The population in Vestfold which peaked at approximately 25 pairs in 1992-93 was estimated at 18-20 pairs in 1998. Overall breeding success is slightly lower than in other populations in Fennoscandia.

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