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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Home range size, habitat use, activity patterns and hunting behaviour of urban-breeding Northern Goshawks Accipiter gentilis
Auteurs :	Christian Rutz, Auteur
Type de document :	Article
Dans :	Ardea (94(2) FAL 2006)
Article en page(s) :	185-202
Résumé :	The Northern Goshawk Accipiter gentilis typically prefers woodland habitat for nesting and hunting. In recent decades, however, the species has started colonising urban environments across Europe. Here I present the first study on the ranging behaviour of urban-breeding Goshawks. Each year from 1997 to 1999, 1 tracked a different adult male during the breeding season in the city of Hamburg, Germany (858 hours of total tracking time; n = 5364 radio-fixes). All corresponding pairs raised young in the year of data collection (3, 3 and 4 juveniles). Average home range size was 863 ha. (100% Minimum Convex Polygons). Males spent 88% of daylight hours in patches of urban green space (mainly parks) and made short but regular hunting excursions into the matrix of built-up habitat. Built-up habitat was used less frequently than expected from its percentage availability. However, 42% of all recorded kills (n = 143) were made in this habitat type, indicating that it offered good foraging opportunities. Hawks spent 9.7% of daylight hours in active flight (1.8% inter-perch flights, 7.9% soaring). Daily activity patterns were bimodal, with peaks in the early morning and in the evening. I observed one hawk hunting regularly after sunset under artificial light conditions. Goshawks hunted by perched hunting (49%), soaring (33%), and fast contour-hugging flights (11%; n = 220 hunts). Average hunting success was 16% (n = 176 directly observed attacks), or one kill every

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