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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Prey of Goshawks outside the breeding season.
Auteurs :	Jan Tottrup Nielsen, Auteur
Type de document :	Article
Dans :	Dansk Ornitologisk Forenings Tidsskrift (97(2) 2003)
Article en page(s) :	193-198
Langues:	Anglais
Résumé :	The diet af Goshawks Accipiter gentilis in Vendsyssel was determined from prey remains collected at plucking sites in autumn (September-November) and winter (December-February) 1977-2001. A total of 1826 prey animals, representing 45 bird species and 3 mammals, were identified. The results elucidate both the geographical and temporal variation within the study area where Pheasants have been released in increasing numbers by gamekeepers, especially after the mid-1990s. For six of the seven most frequent prey species, their importance (proportion of total prey numbers) differed significantly between the sub-areas of the study area, the exception being the Jay. The differences between sub-areas reflect differences in the occurrence and abundance of prey species in the sub-areas; for Mallard and Pheasant these differences are mainly a result of local releases. The four most important species exhibit a marked temporal variation. For all sub-areas combined, the porportion of Pheasant increased from less than 10% to about 30%, while the proportion of domestic pigeon peaked at more than 35% in the late 1980s and then decreased to less than 10% by the end of the study. Black-headed Gull and Woodpigeon fluctuated without any clear tendency. A correction for the uneven contribution to the total by the various sub-areas through the study period did not change these conclusions, except that the Woodpigeon now showed a statistically significant increase. It is concluded that the Goshawk is an opportunistic hunter, primarily taking the most available prey species of size from thrushes to Pheasant. Where gamebirds and ducks are released for shooting purposes, these become important prey species for the Goshawk. Most often, the result will be persecution of the Goshawk locally near release sites, and sometimes over a wider area.

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