La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	The Eurasian Hobby Falco subbuteo in the region of Lake Ammersee. Distribution and population trend from 2000 to 2014
Auteurs :	Ursula Wink, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (54(1) AUG 2015)
Article en page(s) :	41-48
Résumé :	In the region of Ammersee the population of the Eurasian Hobby was studied from 2000 to 2005 in an area of 100 km(2), from 2006 to 2014 in 200 km(2). Twenty four territories with at least one breeding in 15 years were located. In total fifty successfull breeding pairs were found.Ten nests, build by crows, were found, nine on spruce, one on a poplar. Most of them stand in little 1 ha great woods.Most breeding areas of the Hobby lie in vicinity to farm houses, where swallows breed and near litter meadows, which are rich of insects.Most broods were found in years with warm weather in May and June. Were those month cold and wet, breeding success increased.Population size and breeding success varied between years. No trend up or down of the population was continuous, but breeding success decreased from 2010.Typically 3 or 4 broods were found per year. A maximum of 10 territories were occupied in 2011. No breeding occurred only once in 2013, with very cold and wet weather in May and June. This showed the influence of weather on nutrition. All swallows could not feed there young ones, because insects got rare, and cause to that the Hobby had not enough food for his brood.

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