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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Breeding season food limitation drives population decline of the Little Owl Athene noctua in Denmark
Auteurs :	Kasper Thorup, Auteur ; Peter Sunde, Auteur ; Lars B. Jacobsen, Auteur ; Carsten Rahbek, Auteur
Type de document :	Article
Dans :	Ibis (152(4) OCT 2010)
Article en page(s) :	803-814
Résumé :	Many farmland bird species have declined markedly in Europe in recent decades because of changes in agricultural practice. The specific causes vary and are poorly known for many species. The Little Owl, which feeds extensively on large invertebrates and is strongly associated with the agricultural landscape, has declined over most of northwestern Europe, including Denmark. We investigated the likely reasons for the population decline in Denmark by identifying patterns of local extinction (scale, 5 x 5 km2) and estimating demographic parameters affecting local survival, focusing on changes over time and their relationship to habitat characteristics. The distribution of the Little Owl in Denmark contracted considerably between 1972-74 and 1993-96. The extent of contraction varied across the country, and the only habitat correlate was that local disappearance was associated with smaller amounts of agricultural land. Analyses of ring recovery data suggested a constant annual adult survival rate of 61% from 1920 to 2002, which is similar to estimates from countries with stable populations. First-year annual survival rates were much lower than values previously reported. From the 1970s into the 21st century, the mean number of fledglings declined from around 3 to

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