| Titre : | Preliminary results on competition for nest-sites and predation between Eurasian Goshawks (Accipiter gentilis) and Eagle Owls (Bubo bubo) in northern Germany. |
| Auteurs : | Guenther Busche, Auteur ; Hans-Juergen Raddatz, Auteur ; Achim Kostrzewa, Auteur |
| Type de document : | Article |
| Dans : | Vogelwarte (42(3) Februar 2004) |
| Article en page(s) : | 169-177 |
| Résumé : | Since the re-introduction of Eagle Owls in the early 1980's and the establishment of a breeding population since 1984 numbers of Goshawks were declining in northern Germany. During 15 years we monitored 43 breeding attempts in Eagle Owls and 180 breeding attempts in Goshawks. In our area in south-west Holstein the first pair of Eagle Owls started breeding in 1988. Two years later a significant decline of Goshawks started and ended up with one third of the number of Goshawk pairs in 2000. Eagle Owls have occupied most of the Goshawk territories. Also 500 m around Eagle Owl nests no Goshawk was able to establish a nest. Above 500 m distance Goshawks were able to breed successfully during the time of low Eagle Owl density. Later on and in short distance to newly established Eagle Owl nests, Goshawks success was highly affected by intraguild predation from Eagle Owls. Our findings are consistent with Wiens' (1989) six criteria for interspecific competition. The most important are (a) on the population level: one species - the Eagle Owl - reduces the density of an other - the Goshawk and (b) on the level of individual pairs: Goshawks suffer from close breeding owls by a significant reduction of breeding success. This is also consistent with the concept of intraguild predation (Polis et al. 1989). |
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