Stimmanalyse beim Uhu Bubo bubo - eine Möglichkeit zur Individualerkennung.

Ornithol. Anzeiger 44: 91-97.

Volltext (PDF) 

Zusammenfassung:

Die Wiedererkennung von Individuen spielt bei sehr vielen Tierarten eine wichtige biologische Rolle. Denn für die meisten Vorgänge, an denen ein oder mehrere Individuen beteiligt sind, ist es notwendig, dass diese sich gegenseitig individuell erkennen können. Wenn also derartige individuell charakteristische Signale oft biologisch eine sehr wichtige Rolle spielen, können sie gleichermaßen für einen menschlichen Beobachter interessant sein. Denn sie erlauben es ihm, ein Individuum aus der Entfernung zu identifizieren, ohne es einfangen zu müssen. Die Auswertung der bei dieser Studie erhaltenen Daten zeigt, dass es möglich ist, Uhus sehr präzise anhand ihrer Rufe zu identifizieren. Denn der Uhu hat eine individuelle, charakteristische Stimme, die sich von einem Jahr zum anderen nicht ändert.

lengage-biblio

Breeding success, dispersal, and long-term changes in a population of Eagle Owls Bubo bubo in southeastern Sweden 1952–1996.

Ornis Svecica 7(2): 49-60.

Abstract:

In 1950 when the Eagle Owl became legally protected in Sweden, the species was nearly extinct in most parts of the country and survived only with a small population in the southeastern part of the country, along the Baltic Sea coast. This population has been studied in 1952–1996. Recoveries of birds ringed in the study area demonstrated that dispersal was limited; post-fledging dispersal was on average 56.8 km in the first year of life. In birds older than one year the mean distance from the hatching site to the site of recovery was 47.7 km. The mean brood size in successful nests was 1.47 young. However, the mean reproductive success calculated for all occupied territories was only 0.68 young per pair and year. Among all pairs, 43.7% bred successfully and 24.7% failed. Thus, each year 31.6% of the pairs stayed in the territory without breeding. For an extended part of this long term study, reproduction seems to have been just enough to maintain a stable population size in the study area. Only in the years 1986–90, there seemed to be a surplus of young produced in the study population resulting in new breeding pairs, predominantly outside the old study area. From a national project with captive breeding, 2,759 young Eagle Owls have been released in nearly all parts of Sweden. Around 1982, the number of pairs originating from the released birds was in equilibrium with the original "wild" population, and in 1995 the released birds and their descendants were about twice as many. In recent years probably many pairs are of mixed origin, and the mixing of the two populations is likely to increase in the future. In total, there were about 400 territories occupied by Eagle Owls in Sweden in 1996.

olsson-biblio