Bylicka, Marta; Wikar, Dominik; Ciach, Michał; Bylicka, Małgorata
December 2007
Acta Zoologica Lituanica;Dec2007, Vol. 17 Issue 4, p286
Academic Journal
Surveys of the Common Buzzard (Buteo buteo) were regularly carried out on three permanent transects in the Kotlina Orawsko-Nowotarska valley in the middle and at the end of each month of the 2002/03-2004/05 seasons lasting from October to March. During surveys information about the Common Buzzard's behavior was collected. Data were classified into four meteorological periods: autumn, early winter, winter and early spring. The Common Buzzard's density varied from 0.6 to 18.4 ind./10 km. At the end of autumn migration, bird density decreased and at the beginning of spring migration it increased. The Kotlina Orawsko-Nowotarska valley does not offer favourable wintering conditions. However, the density minimums recorded during winter show that some Buzzards do stay in the area despite extremely severe weather conditions. The Common Buzzard's hunting behaviour differed significantly during these metereological periods. Perching was the main hunting behaviour of the Common Buzzard during early winter and winter. The proportion of soaring increased significantly during autumn and early spring. The frequency of patrol flights is constant and independent of meteorological periods. Probably, perching as a hunting method allows birds to save energy. The higher frequency of soaring during autumn and early spring could be the result of using this flight for migration. It is also related to some breeding and territorial behaviour patterns during early spring.


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