La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Ospreys Pandion haliaetus in Estonia: A historical perspective
Auteurs :	Asko Lohmus, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (122(3-4) 2001)
Article en page(s) :	167-171
Résumé :	Population dynamics, productivity and mortality of Osprey in Estonia were analysed based on published information, archive material and original monitoring data. In the past 100 years, there were two periods of decline, one at the beginning of the 20th century and one in the 1970s. These were obviously due to persecution and pesticide poisoning, respectively. During the last sixteen years the situation has improved, with 45-50 breeding territories in Estonia in 1999. The species disappeared from western parts of the country probably because of poorer feeding conditions and nowadays inhabits the areas with highest fish densities. After a depression in the 1970s, productivity is presently very high (on average 1.90 young per occupied nest in 1985-1999). Egg and nestling mortality is low, indicating that pesticides or food limitation have no significant impact. Probably at least one third of Osprey deaths are due to poaching. As natural nests are short-lived (on average 1.86+-0.52 years), many have been replaced by artificial nests. The evidence for higher productivity in artificial nests is discussed.

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