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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Goshawks and Pheasants: experience from experimental trapping and transport away of hawks from Pheasant release sites
Auteurs :	Jan Tottrup Nielsen, Auteur
Type de document :	Article
Dans :	Dansk Ornitologisk Forenings Tidsskrift (105(3) 2011)
Article en page(s) :	167-178
Langues:	Anglais
Résumé :	Goshawks and Pheasants: experience from experimental trapping and transport away of hawks from Pheasant release sitesThe practice of releasing Pheasants for hunting purposes has often led to "regulation" of predators. When large-scale release of Pheasants started in Vendsyssel (northern Jutland in Denmark) in the 19905, the population of Goshawks was very high. This quickly led to (illegal) trapping and shooting of the Goshawks, leading to a marked decrease of Goshawk numbers near release sites (Table 1).At the time, the local Goshawks had been under study by the author through many years, in a 2417 km(2) study area in Vendsyssel. Beginning in 1998, a parallel study was initiated, aiming at reducing the conflicts between Pheasant releasing and Goshawks. In cooperation with Pheasant releasers, Goshawks were trapped and later released several kilometers away from the site where trapped, in order to find out if they returned to the site of capture (and so continued to pose a threat to the Pheasants).During 1998-2009, 165 Goshawks were captured at Pheasant release sites. All but 11 of the birds were subsequently released away from the site after being ringed (if necessary many were ringed already). A total of 18 (12%) of the birds were subsequently retrapped at a Pheasant release site in Vendsyssel, half of them at the same locality as the first time and half at another release site (Table 4). Of the 18 retraps, 16 were subsequently released, but none were captured a third time, so a total of 170 releases led to 18 retraps (11%). A large majority (163 of the 183 captures) were young birds (1st calendar year, 1K), and most (99 of 183, P = 0.07) were males. Weights and measures suggest that the (originally) unringed birds, like the ringed ones, were of local origin, not migrants from the north.

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