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  • Breeding density and altitudinal distribution of the ural, trawny, and boreal owls in north Dinaric Alps (central Slovenia) = Densidad de anidamiento y distribución altitudinal de los buhos Ural, leonado y boreal en los Alpes Dinaricos del norte (Eslovenia central)
    Vrezec, Al
    Ural (Strix uralensis), Tawny (Strix aluco), and Boreal owl (Aegolius funereus) density and altitudinal distribution were determined using playback to census owls on Mt. Krim (North Dinaric Alps, ... central Slovenia). Survey points were selected proportionally by altitude according to the relief of thearea (820-1060 masl). Density of Ural Owls was estimated to be 2.2 territaries/10 km2; high relative to published data from Europe, while densities of Tawny (4.0 territories/10 km2) and Boreal owls (2.8 territories/ 10 km2) were in the range or fower than other European data. The Tawny Owis were found at signi6cantly lower altitudes (320-850 masl), while Boreal Owls were at higher altitudes (700-940 masl) than expected. I suggest that Ural Owlterritories were located in suboptimal habitat for Tawny Owls. The segregation of these owts by altitude in temperate-zone, continuous-montane forests is either a consequence of competitive exclusion or predation. The similarity in altitudinal distribution between Tawny and Boreal owls was low, suggesting that Tawny Owl territories are not suitable habitat for Boreal Owls. At high altitudes, harsh conditions prevent the Tawny Owl from competingwith the Ural Owl; an advantage for the Boreal Owt, which was capableof surviving harsh conditions within Ural Owl territories. Further studies are needed to determine competitive exclusion or predation interactions among these owls.
    Vir: The Journal of raptor research. - ISSN 0892-1016 (Letn. 37, št. 1, 2003, str. 55-62)
    Vrsta gradiva - članek, sestavni del
    Leto - 2003
    Jezik - angleški
    COBISS.SI-ID - 16181465

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