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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Post-fledging dispersal of Northern Goshawks Accipiter gentilis in an urban environment.
Auteurs :	Christian Rutz, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (124(2) 2003)
Article en page(s) :	93-101
Résumé :	Hamburg is one of the few cities with an urban population of Northern Goshawks. Breeding pairs use public parks, cemeteries, hospital grounds and private gardens for nesting. In 1997, both surviving juveniles (female, male) of one urban breeding pair were trapped during the post-fledging period, fitted with radio-transmitters and tracked on their post-fledging dispersal. Both hawks dispersed around the 25 July independently and in different directions. Neither of them was found at the natal nest site again during the monitoring period which lasted 8 and 5 months, respectively. For roosting and hunting, they used forests and parks at the periphery of the city as well as built-up areas with high levels of human activity in the city centre. Both individuals repeatedly returned to sites, which they had discovered at the very beginning of their dispersal, but continued exploring new urban and suburban areas of the city. From fledging age onward, both hawks showed a remarkable tolerance of human disturbance. Their behaviour was more secretive in forested suburban areas than in the city centre. They perched on electricity pylons and TV aerials, used buildings for cover while hunting and plucked kills on roofs and chimneys. Roost sites were located in suburban woods and urban back-yards. Night activity was recorded on five occasions. The male was found with a broken wing in a private garden in December 1997, and signal contact with the female was lost in March 1998. This is the first study investigating the dispersal of city-fledged Northern Goshawks. It demonstrates the behavioural flexibility of this species and gives some examples of how Goshawks adjust their behaviour in response to novel features of an urban environment.

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