La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	The breeding population of the Hobby in Derbyshire
Auteurs :	Anthony Messenger, Auteur ; Martin Roome, Auteur
Type de document :	Article
Dans :	British Birds (100(10) OCT 2007)
Article en page(s) :	594-608
Résumé :	The breeding density and nesting success of the Hobby Falco subbuteo were studied in 412 km(2) of lowland farmland in Derbyshire between 1992 and 200 1, along with nest-site choice, spacing and occupancy rate. During the. study period, the number of breeding pairs ranged between seven and 18, giving a mean breeding density of 3.06 pairs per 100 km(2). At least 35% of nesting ranges were occupied every year. A mean of 2.44 young fledged from successful nests and, of 126 breeding attempts only seven failed. The main reason for the high level of success may be the greater availability of invertebrate prey (perhaps reflecting climate change).The species also had few predators in the study area and was tolerant of humans in vehicles and thus able to breed undisturbed on modern, highly mechanised farms, as well as close to roads. The main factors preventing success being even higher appeared to be occasional unintentional human disturbance and hazardous materials used by crows (Corvidae) for building nests.

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