| Titre : | The impact of food availability and food quality on the reproduction of the Eagle Owl Bubo bubo in south-western Lower Austria |
| Auteurs : | Christoph Leditznig, Auteur |
| Type de document : | Article |
| Dans : | Ornithologischer Anzeiger (44(2-3) DEC 2005) |
| Article en page(s) : | 123-136 |
| Résumé : | Whether eagle owls can breed Successfully, depends on a number of factors. The most significant factor is man's direct and indirect influence on the owls' breeding success. Studies of an eagle owl part population in south-western Lower Austria have shown that, apart from the influence of man, food and food availability also play a decisive role in breeding success. Using data of 26 eagle owl territories and of 189 broods from the last 20 years, an average yearly reproduction of 0.90 young could be determined. The average number of young per successful breeding was 1.92. There were, however, significant differences according to habitat types. In the Alpine foothills (Alpenvorland), eagle owls had a yearly reproduction of 1.56 young and 2.22 young per successful breeding due to good prey supply and availability. Alpine eagle owls, by way of comparison, had a yearly reproduction of 0.29 young and 1.25 young per successful breeding. They had to live on limited prey supply. Due to extensive forest areas and highly unfavourable climatic conditions, food availability was limited as well. In order to assess the chances for a successful breeding of eagle owls, three questions with regard to nutrition have to be answered:1. Is food supply sufficient for the eagle owls to breed successfully?2. Does the supply meet the energy demands of the whole eagle owl family and how much energy is used for prey-catching?3. Is the prey actually available to the eagle owls? |
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