Breeding Distribution and Nest Site Diversity of Barn Owl (Tyto Alba) in the Context of Restoration of Agricultural Sector in Central South Bulgaria


The Barn Owl (Tyto alba) bred in 15 UTM squares (75%, n = 20) of the Kazanlak Valley (central south Bulgaria) at 33 localities (55% confirmed, 12% probable and 33% possible breeding). Its distribution in the Valley was found to be five times larger and its population size ten times greater during our study period than previously thought. Evidence of one to five breeding localities (mean 2.2±1.3) was detected in each occupied UTM square. A breeding density of 4.1 bp/100 km2 was close to the average in Central Europe. Nests inside or on metal frames and ducts were typical in the region and gave possibility for its successful breeding in most of the habitable buildings. The Barn Owls were breeding mainly in poorly maintained and abandoned buildings whose supply has not decreased markedly since the agricultural restoration started in Bulgaria after it joined the European Union and intensive industrial agriculture has resumed with EU support. Currently, it appears that Barn Owl is not threatened by a ‘housing shortageʼ over the next decade.

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  • Boev, Z., Milchev, B. & Popov, V. 2007. Fauna, zoogeography, and ecology of birds in Bulgaria. − In: Fet, V. & Popov, A. (eds.) Biogeography and ecology of Bulgaria. − Springer Publishers, D., pp. 39−84.

  • Borda-de-Águaa, L., Grilob, C. & Pereira, H. 2014. Modeling the impact of road mortality on Barn Owl (Tyto alba) populations using age-structured models. − Ecological Modelling 276: 29-37. DOI 10.1016/j.ecolmodel.2013.12.022

  • BirdLife International 2004. Birds in Europe: population estimates, trends and conservation status. − Cambridge, UK: BirdLife International. (BirdLife Conservation Series No. 12). de Bruijn, O. 1994. Population ecology and conservation of the Barn Owl Tyto alba in farmland habitats in Liemers and Achterhoek (the Netherlands). − Ardea 82: 1−109.

  • Georgiew, V. 1998. Erste Angaben über hybride Schleiereulen Tyto alba in Bulgarien [First details on hybrid Barn Owls Tyto alba in Bulgaria]. − Ornithologische Mitteilungen 50: 219−220. (in German) Glutz von Blotzheim, U. & Bauer, K. 1994. Handbuch der Vögel Mitteleuropas [Handbook of the birds of Central Europe]. Bd. 9. − Akademische Verlagsgesellschaft, Wiesbaden Golawski, A. & Kasprzykowski, Z. 2006. Habitat use of the Barn Owl Tyto alba and the Little Owl Athene noctua in Central-eastern Poland. − Biological Letters 43: 33−39.

  • Golawski, A., Kasprzykowski, Z. & Kowalski, M. 2003. The occurrence of the Barn Owl Tyto alba in sacred buildings in Central-eastern Poland. − Ornis Hungarica 12−13: 275−278.

  • Golemanski, V. (ed.) 2011. Red Data Book of the Republic of Bulgaria. Vol. 2. Animals. IBEI − BAS & MOEW. Sofia, Bg., pp. 383

  • Hagemeijer, E. & Blair, M. (eds.) 1997. The EBCC Atlas of European breeding birds: Their Distribution and Abundance. − T & AD Poyser, London, pp. 923

  • Hindmarch, S., Krebs, E., Elliott, J. & Green, D. 2012. Do landscape features predict the presence of Barn Owls in a changing agricultural landscape? − Landscape and Urban Planning 107: 255−262.

  • Iankov, P. (ed.) 2007. Atlas of breeding birds in Bulgaria. − BSPB, Conservation Series Book 10, Sofia, Bg. IUCN, 2013. IUCN Red List of Threatened Species. Version 2013.2. . Downloaded on 09 February 2014.

  • Kopralev, I. (ed.) 2002. Geography of Bulgaria. − Bulgarian Academy of Science, Sofia, Bg. (in Bulgarian with English Summary) Martin, J., Branch, L., Raid, R. & Beyeler, S. 2010.

  • Temporal instability of agricultural habitat reduces reproductive success of Barn Owls (Tyto alba). - The Auk 127: 909−916.

  • Martínez, J. & Zuberogoitia, Í. 2004. Habitat preferences and causes of population decline for Barn Owls Tyto alba: a multi-scale approach. − Ardeola 51: 303−317.

  • Mebs, T. & Scherzinger, W. 2000. Die Eulen Europas [Owls of Europe]. − Franckh-Kosmos Verlag, Stuttgart, D., pp. 396 (in German) Milchev, B. 2012. New localities of small mammals (Mammalia: Eulipotyphla, Rodentia) from the Barn Owl (Tyto alba) diet in the Kazanlak Valley (Central South Bulgaria). − Forestry Ideas 18: 203−208.

  • Milchev, B. 2013. Barn Owl Tyto alba rock nest close to Eagle Owls Bubo bubo in Bulgaria. − Vogelwelt 134: 75−82.

  • Milchev, B., Boev, Z. & Kodjabashev, N. 2006. Breeding distribution and diet composition of the Barn Owl (Tyto alba Scopoli, 1769) (Aves: Strigiformes) in the North-Western Upper Thracian Plane (Bulgaria). − Acta Zoologica Bulgarica 58: 83−92. References

  • Miltschev, B., Georgiev, V. & Kovatschev, A. 2002. Brutbestand und Brutplatzwahl der Scleiereule (Tyto alba) in Südost-Bulgarien [Breeding status and nest site selection of the Barn Owl (Tyto alba) in South-eastern Bulgaria]. − Egretta 45: 115−121. (in German with English Summary)

  • Miltschev, B., Boev, Z. & Georgiev, V. 2004. Die Nahrung der Schleiereule (Tyto alba) in Südost- Bulgarien [Food of the Barn Owl (Tyto alba) in South-eastern Bulgaria]. − Egretta 47: 66−77. (in German with English Summary) MOSW. 2013. Project ‘Information system for protected zones of the Bulgarian Natura 2000 networkʼ. − Available at http://www.natura2000.moew.government. bg [last accessed 24 February 2014] Nankinov, D. (ed.) 2004. Breeding totals of the ornithofauna in Bulgaria. − Green Balkans, Plovdiv, Bg.

  • Simeonov, S., Michev, T. & Nankinov, D. 1990. Fauna Bulgarica. Vol. 20. Aves. Part. I. − BAS, Sofia, Bg. (in Bulgarian with English Summary) Taylor, I. 1994. Barn Owls: predator-prey relationships and conservation. − Cambridge University Press, Cambridge, pp. 324


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