| Titre : | Some breeding habits of the Ural Owl Strix uralensis in Slovenia |
| Auteurs : | Al Vrezec, Auteur ; Ksenja Kohek, Auteur |
| Type de document : | Article |
| Dans : | Acrocephalus (23(115) 2002) |
| Article en page(s) : | 179-183 |
| Résumé : | The Ural Owl Strix uralensis breeding phenology, use of nest-site types, clutch and brood size are presented for Slovenia. The data from 33 nests were analysed. The most common nest-site types are tree holes, semi-holes, and tree stumps, which are usually 8 in high from the ground mostly on the beech Fagus sylvatica. Only exceptionally, Ural Owls bred on the ground, in a raised hide or in a nest box, which suggests that there are sufficient natural nest-sites still available in Slovenian forests. The mean clutch size was 2.4 eggs per nest, which is quite low according to other European data. There are two possible explanations for that: (1) high breeding density which usually means lower breeding success; and (2) low food availability in the prebreeding period, which decreases the clutch size. Fat Dormouse Glis glis seems to be the Ural Owl's main prey in Slovenia, and it reaches its population maximum as late as in July and August. The brood size (2.0 fledglings per brood) is within the range of other European data, suggesting high survival rate of the young. In Slovenia, the Ural Owl starts to breed very late according to data from other countries in Europe; nests with eggs were found between April 1(st) and June 11(th), and the last nonflying fledglings outside their nest in August. One of the explanations for such late breeding of the Ural Owl can be the so-called 11 waiting strategy hypothesis", according to which the female postpones egg laying in anticipation of better food conditions, in Slovenia until the occurrence of Fat Dormouse in the summer. |
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