Sex and Age Biased Mobility in Hawk Owls Surnia ulula

Sex and Age Biased Mobility in Hawk Owls Surnia ulula

The distribution of sex and age classes of Hawk Owls in Norway outside the breeding season was analysed from 79 fresh birds and museum specimens. The tendency to move from the breeding range down to the lowlands was most pronounced in adult females, less so in juvenile males, and least in adult male...

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Veröffentlicht in:Ornis Scandinavica 1986-12, Vol.17 (4), p.306-308
Hauptverfasser: Byrkjedal, Ingvar, Langhelle, Gunnar
Format: Artikel
Sprache:eng
Schlagworte:
Age discrimination
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Autoecology
Aviculture
Biological and medical sciences
Birds of prey
Breeding
Female animals
Fundamental and applied biological sciences. Psychology
Hawks
Male animals
Nesting sites
Owls
Vertebrata
Young animals
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Beschreibung
Zusammenfassung:The distribution of sex and age classes of Hawk Owls in Norway outside the breeding season was analysed from 79 fresh birds and museum specimens. The tendency to move from the breeding range down to the lowlands was most pronounced in adult females, less so in juvenile males, and least in adult males and juvenile females. A combination of social dominance and competition for breeding territories may account for this distribution pattern.
ISSN:0030-5693
DOI:10.2307/3676818