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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Raptor populations in two survey areas in Southeast Denmark
Auteurs :	Hans Erik Jorgensen, Auteur
Type de document :	Article
Dans :	Dansk Ornitologisk Forenings Tidsskrift (92(4) 1998)
Article en page(s) :	307-316
Langues:	Anglais
Résumé :	Breeding birds of prey (pairs initiating nest building or repair) were recorded annually (Fig. 2, Appendix 1) in two 100 km2 areas in SE Denmark in 1977-97, and during the mid-1990s in two much larger areas (Tab. 1) which included the two 100 km2 areas. All census areas and subareas are shown in Fig. 1. Most of the larger subareas were also surveyed in some of the previous years (Tab. 2). For a translation from Danish to Latin names of raptor species, see Tab. 1. The Honey Buzzard Pernis apivorus had a rather small but remarkably stable population, whereas the proportion breeding successfully varied markedly between years. The Marsh Harrier Circus aeruginosus was numerous in the census areas which both were situated within the core area of the species in Denmark (cf. Jorgensen 1985). During the years prior to the present study, the harrier population in Denmark increased considerably (Jorgensen l.c.), and the increasing trend continued during the study, albeit at a moderate rate in most areas. Goshawk Accipiter gentilis numbers were stable during the study, and the same apparently held true for the Sparrowhawk A. nisus, although a thorough census of this species was confined to few years and areas only. The Buzzard Buteo buteo was by far the most common raptor species in most areas, and numbers generally increased during the study period. The Kestrel Falco tinnunculus, finally, was fairly common in most areas, and especially so in subarea B. Contrary to the other species the Kestrel population fluctuated markedly from year to year, reflecting the varying abundance of its staple prey, the short-tailed vole Microtus agrestis. A comparison with population densities in other large study areas (>100 km2) in Denmark and Germany is given in Tab. 3. Background information on the status of Danish raptors is given by Jorgensen (1989).

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