Food niche overlap in co-existing Barn Owl Tyto alba (Scopoli 1769) and Great Horned Owl Bubo virginianus Gmelin 1788 in intensively used farmland

• Autorzy: Kopij G.
• Języki publikacji: EN

Abstrakty

EN

The study was conducted at a site where the Great Horned Owl and the Barn Owl nested in a close proximity to each other in an intesivelly managed farmland in north-eastern Oregon. By the means of pellet content analysis it has been shown that food niches of both species almost totally overlapped. Their main diet was composed of Microtus voles (numerically: 79% in Great Horned Owl and 86% in Barn Owl) which were probably superabundant in this site.

Słowa kluczowe

EN

food niche overlap; Great Horned Owl; Bubo virginianus; Barn Owl; Tyto alba; farmland; Oregon; diet composition

• Wydawca: -
• Czasopismo: Polish Journal of Ecology
• Rocznik: 2013
• Tom: 61
• Numer: 1
• Opis fizyczny: p.179-181,ref.

Twórcy

autor

Kopij G.

• Department of Vertebrate Ecology, Wroclaw University of Environmental and Life Sciences, Kozuchowska 5b, 51-631 Wroclaw, Poland

Bibliografia

• Begon M., Harper J.L., Townsend C.R . 1990 – Ecology – Individuals, populations and communities – Blackwell Scientific Publ., London, UK, 2nd edition. Chapter 4.
• Herrera C.M., Hiraldo F. 1976 – Food-niche and trophic relationships among European owls – Ornis scand. 7: 29 –41.
• Houston C.S., Smith D.G., Rohn C. 1998 – Great Horned Owl (Bubo virginianus) – Birds of North America, 372 – Philadelphia, Academy of Natural Sciences.
• Johnsgard P.A. 2002 – North American owls: biology and natural history, 2nd ed. – Washington, Smithonian Institution Press.
• Konig C., Weick R . 2008 – Owls of the world – London, Christopher Helm.
• Kopij G. 2006 – The structure of assemblages and dietary relationships in birds in south african grasslands – Wrocław, Wydawnictwo Akademii Rolniczej we Wrocławiu.
• Marti 1974 – Feeding ecology of four sympatric owls – Condor, 76: 45 –61.
• Maser C., Storm R.M. 1970 – A key to Microtinae of the Pacific North-West – O.S.U. Book Stores Inc., Corvallis, OR.
• Mikkola H. 1983 – Owls of Europe – Poyser, Calton.
• Rudolph S.G. 1978 – Predation ecology of coexisting Great Horned and Barn owls – Wilson Bul. 90: 134 –137.
• Shannon C.E., Weaver W. 1949 – The mathematical theory of communication – Univ. Illinois Press, Urbana.
• Tylor I. 1994 – Barn Owls: predator-prey relationships and conservation – Cambridge (UK), Cambridge University Press.
• Yalden D.W. 2009 – The analysis of owl pellets – Carronades (U.K.) – The Mammal Society.
• Verts B.J., Carraway L.N. 1998 – Land mammals of Oregon – University of California Press, Berkeley.
• Woodward G., Hildrew A.G. 2002 – Bodysize determinants of niche overlap and intraguild predation within a complex food web – J. Animal Ecol. 71: 1063–1074