La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Population status and breeding success of Osprey Pandion haliaetus in Sweden, 1971-1998
Auteurs :	Tjelvar Odsjo, Auteur ; Jan Sondell, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (122(3-4) 2001)
Article en page(s) :	155-166
Résumé :	The breeding Osprey populations in six areas in South and Central Sweden were monitored eight times in the period 1971-1998. The aims were to determine population size and assess numerical trends over the study period and to find out the reproductive success in lake and forest habitats. The population has slowly grown during the last quarter of the century despite the negative influence from human activities such as pollution with pesticides, forestry and disturbance and despite increased predation by Pine Martens. The mean breeding success per year varied from 1.30 to 1.92 young per nest. A mean of 2.58 eggs plus newly hatched young was recorded at the first nest visit and 1.56 young, 4-5 weeks old, at the second. The production of young is obviously more than enough to maintain the slow increase recorded and there are some indications that the Swedish surplus supports other newly established or expanding European Osprey populations.

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