title

Characteristics of the diet of the western barn owl and the little owl in the Zakarpattia Oblast (Ukraine)

author(s)

Mykhailo Drebet (orcid: 0000-0002-7639-8815)
Leonid Pokrytiuk (orcid: 0000-0002-8525-6755)

affiliation

Podilski Tovtry National Nature Park (Kamianets-Podilskyi, Ukraine);
Institute of Ecological and Religious Studies (Beregove, Ukraine)

bibliography

Theriologia Ukrainica. 2025. Vol. 29: 105–114.

DOI

language

English, with Ukrainian summary, titles of tables, captures to figs

abstract

The article presents the results of an analysis of approximately 150 pellets (containing 178 food items) of the Little Owl (Athene noctua) and about 300 pellets (containing 1,268 food items) of the Barn Owl (Tyto alba) collected in the Berehove District, Zakarpattia Region, during 2006–2008. The analysis of owl pellets is a highly effective method for studying the composition of faunal communities and the structure of prey species assemblages. Pellet analysis serves as a reliable tool for monitoring programs and for identifying indicator species of small mammals. Among owl species common in Europe, the populations of the Barn Owl and, especially, the Little Owl are steadily declining, primarily due to ongoing urbanization, which increases bird mortality. The Barn Owl, in particular, suffers from the modernization and reconstruction of buildings, leading to the loss of traditional nesting sites. Small mammals constitute the primary prey of both owl species, comprising 99.8% of the Barn Owl’s diet and 90.4% of the Little Owl’s diet. The trophic niche breadth of the Barn Owl, based on Simpson’s index, is twice as wide as that of the Little Owl (5.2 vs. 2.0, respectively). The overlap of trophic niches between these predators, measured using Pianka’s index, is 70.5%. The greatest similarity in prey usage is observed in the consumption of secondary and supplementary food components (91.7–99.3%), whereas similarity in the use of the primary prey species (Microtus arvalis) is lower, at 71.1%. During periods of environmental degradation and reduced abundance of the primary prey, trophic niche overlap increases due to shared consumption of secondary and supplementary prey species. The Little Owl expands its trophic niche by including vertebrates from various taxonomic classes (birds, reptiles, amphibians, and fish), while the Barn Owl broadens its niche by incorporating a greater diversity of small mammal species. This niche expansion reduces interspecific competition. Despite the overall similarity in diet composition, the trophic niches of the Barn Owl and Little Owl in Zakarpattia do not completely overlap. The similarity in the use of the primary prey is approximately 70%, which facilitates their coexistence.

keywords

barn owl, little owl, food, trophic niche, Transcarpathia

references

Appak, B. A. 2001. On the sightings of rare bird species in Crimea. Berkut, 10 (2): 152. [Russian]
Atamas, N. 2004. Features of studying micromammal fauna through the analysis of raptor pellets. Visnyk of the Lviv University. Biological Series, 38: 133–136. [Ukrainian]
Atamas, N., M. M. Tovpinets. 2006. Mammals in the diet of birds of prey in the Luhansk region: a general overview of data. Proceedings of the Theriological School, 7: 260–267. [Ukrainian]
Bashta, A.-T. V. 2009. Current status of owls (Strigiformes) in the western part of Ukraine. Zoological Science in Modern Society: Materials of the All-Ukrainian Scientific Conference. Phytosociocenter, Kyiv, 55–58. [Ukrainian]
BirdLife... 2021. Athene noctua (Europe assessment). The IUCN Red List of Threatened Species 2021: e.T22689328A166226777. https://doi.org/10.2305/IUCN.UK.2021-3.RLTS.T22689328A166226777.en
BirdLife ... 2021. Tyto alba (Europe assessment). The IUCN Red List of Threatened Species 2021: e.T22688504A166222469. https://doi.org/10.2305/IUCN.UK.2021-3.RLTS.T22688504A166222469.en
Bokotey, A. A., N. V. Dziubenko, I. M. Horban, I. V. Kuchynska, A.-T. V. Bashta, [et al.]. 2010. Breeding Bird Fauna of the Upper Dnister Basin. Lviv, 1–400. [Ukrainian]
Bon, M., E. Ratti, A. Sartor. 2001. Seasonal variation in the diet of the Little Owl Athene noctua (Scopoli, 1769) in a tilled site on the edge of the Venice Lagoon. Bollettino del Museo civico di storia naturale di Venezia, 52: 193–212.
Bontzorlos, V., S. Peris, C. Vlachos, D. Bakaloudis. 2005. The diet of the Barn Owl in the agricultural landscapes of central Greece. Folia Zoologica, 54: 99–110.
Cherkashchenko, M. I. 1970. Materials on the biology of the Little Owl in the conditions of the Rivne region. Materials of the 4th Scientific Conference of Zoologists from Pedagogical Institutes. Gorky, 401–402. [Ukrainian]
Conti, A., A. Brugnoli, L. Fornasari, G. Bonelli. 2020. Forty years of Barn Owl (Tyto alba) pellet analysis in a rural area of Northern Italy. Ardeola, 68(2), 129–144. https://doi.org/10.1163/15707563-00000127
Contoli, L. 1981. Ruolo dei micromammiferi nella nicchia trofica del Barbagianni (Tyto alba) nell`Italia centro-meridionale. Avocetta, 5: 49–64.
Crescia, P., V. Ferri, S. Celletti, C. Soccini, C. Battisti.  2024. An unusually high prey richness of small mammals in Tawny owl (Strix aluco) pellets: a comparison with Italian data-sets suggests a role of habitat heterogeneity when controlling for sample size. Atti della società Toscana di Scienze Naturali, Memorie, Serie B, 130: 25–30. https://doi: 10.2424/ASTSN.M.B.2023.03
Domashevsky, S. V. 1993. The barn owl (Tyto alba) in Crimea. Vestnik zoologii, (4): 55. [Russian]
Drebet, M. 2022. Monitoring of the mammal fauna by studying owl pellets: a case of small mammals in protected areas of Podillia. Theriologia Ukrainica, 24: 16–27. https://doi.org/10.15407/TU2404
Fattorini, S. 1999. Role of the beetles in raptor diets from a Mediterranean urban area (Coleoptera). Fragmenta Entomologica, 31: 57–69.
Fesenko, H. V., A. A. Bokotey. 2002. Birds of the Fauna of Ukraine: Field Guide. Kyiv, 1–416. [Ukrainian]
Geographical... 1990. Geographical Encyclopedia of Ukraine. Volume 1. Kyiv, 82. [Ukrainian]
Georgiev, D. G. 2005. Food niche of Athene noctua (Scopoli, 1769) and Tyto alba (Scopoli, 1769) (Aves: Strigiformes) co-existing in one region of the upper Tracian valley (South Bulgaria). In: Animalia. — Scientific studies — biology. University of Plovdiv «Paisii Hilendarski», 41: 115–122.
Godovanets, B. Y. 2009. Current status and conservation of owls in the Ukrainian Carpathians. In: Zoological Science in Modern Society. Materials of the All-Ukrainian Scientific Conference. Phytosociocenter, Kyiv, 117–121. [Ukrainian]
Gotta, A., G. Pigozzi. 1997. Trophic niche of the barn owl and little owl in a rice field habitat in northern Italy. Italian journal of zoology, 64 (1): 55–59. https://doi.org/10.1080/11250009709356172
Goutner, V., H. Alivizatos. 2003. Diet of the barn owl (Tyto alba) and the Little Owl (Athene noctua) in wetlands of northeastern Greece. Belgian Journal of Zoology, 133: 15–22.
Hindmarch, S., E.A. Krebs, J. Elliott, D. J. Green. 2014. Urban development reduces the fledgling success of Barn Owls in British Columbia, Canada. The Condor: Ornithological Applications, 116 (4): 507–517. https://doi.org/10.1650/CONDOR-13-052.1
Kapelyukh, Y. I. 1999. A record of the Barn Owl near the Medobory Reserve. Berkut, 8 (1): 117. [Ukrainian]
Kapelyukh, Y. I. 2008. Diurnal birds of prey and owls of the Medobory Nature Reserve. In: Recent Studies of Falcons and Owls. Materials of the 3rd International Conference. Kryvyi Rih, 139–145. [Ukrainian]
Khlebosolov, E. I. 2002. Theory of the ecological niche: history and current state. Russian Journal of Ornithology, 203: 1019–1037. [Russian]
Kiyko, A. O., O. I. Yakubenya. 1995. Species composition, distribution, and feeding of owls in the Lviv region. In: Problems of Study and Conservation of Birds. Materials of the 6th Meeting of Ornithologists of Western Ukraine. Lviv, Chernivtsi, 61–63. [Ukrainian]
Koshelev, A. I., I. D. Belashkov. 2002. First record of the barn owl (Tyto alba alba) in the Melitopol region in winter 2002. Branta, 5: 146–149. [Russian]
Kotsyuruba, V. V., V. I. Strygunov. 2003. On the finding of the barn owl (Tyto alba guttata) in Kryvyi Rih. Branta, 6: 201–202. [Russian]
Petrovych, Z. O., K. O. Redinov. 2010. Records of the barn owl in the Mykolaiv region. Berkut, 19 (1–2): 107. [Ukrainian]
Pidoplichko, I. H. 1935. On owl pellets. Bulletin of the Kyiv Plant Protection Station, (3): 14–19. [Ukrainian]
Pokrytyuk, L. V., A. E. Lugovoy. 2009. On the biology of the barn owl in the Transcarpathian plain. In: Volkov, S. V. [et al.] (eds). Owls of Northern Eurasia: Ecology, Spatial and Biotopic Distribution. Moscow, 172–176. [Russian]
Poluda, A. M. (ed.). 2021. Breeding Bird Atlas of Ukraine. Ukrainian Society for the Protection of Birds, Kyiv, 1–296. [Ukrainian]
Potish, L. 2009. Birds of Zakarpattia Oblast (annotated list). Lviv, 1–52. [Ukrainian]
Priklonsky, S. G. 2001. Birds of Russia and neighboring countries: the Little Owl Athene noctua (Scopoli, 1769). Russian Ornithological Journal, 158: 763–779. [Russian]
Prokopenko, S. P., M. M. Beskaravainy. 2009. New data on the distribution of the barn owl Tyto alba (Scop.) in Crimea. Branta, 12: 167–169. [Russian]
Romanowski, J., D. Altenburg, M. Zmihorski. 2013. Seasonal variation in the diet of the little owl, Athene noctua, in the agricultural landscape of Central Poland. North-Western Journal of Zoology, 9 (2): 310–318 (article No. 131603). URL
Pucek, Z. (ed.). 1984. Klucz do oznaczania ssakow Polski. Panstw. Wyd. Nauk., Warszawa, 1–388.
Salek M., M. Lovy. 2012. Spatial ecology and habitat selection of Little Owl Athene noctua during the breeding season in Central European farmland. Bird Conservation International, 22 (3): 328–338. https://doi.org/10.1017/S0959270911000268
Sara, M. 1999. Ecological niche of Strigiformes Strix aluco, Tyto alba, Athene noctua, Asio otus, Otus scops in Sicily, Italy. Naturalista Siciliano, 14: 109–122.
Shtegman, B. K. 1960. On the biology of the Little Owl in the southern Pri-Balkhash region. Ornithology, 3: 315–318. [Ukrainian]
Skilskyi, I., L. Khlys, L. Meleshchuk, N. Smirnov. 2007. Trophic relationships of the Little Owl in the Prut-Dnister interfluve of Ukraine and adjacent territories of the Bukovinian Carpathians. Bulletin of the Vasyl Stefanyk Precarpathian National University. Biology Series, 7–8: 151–154. [Ukrainian]
Strautman, F. I. 1954. Birds of the Soviet Carpathians. Academy of Sciences of the Ukrainian SSR, Kyiv, 1–332. [Russian]
Talposh, V. S. 1964. The Barn Owl in Zakarpattia and its role in controlling harmful rodents in urban conditions. Report of the Scientific Conference of the Kremenets Pedagogical Institute (1963). Kremenets, 55–57. [Ukrainian]
Tatarinov, K. A. 1960. Feeding of the Barn Owl, Tyto alba (Scop.), in the northern regions of the Pannonian lowland. Proceedings of the Problem and Thematic Meeting, IX. Leningrad, Moscow, 230–232. [Russian]
Tatarinov, K. A. 1973. Vertebrate Fauna of Western Ukraine. Lviv, 1–324. [Ukrainian]
Vetrov, V. V., A. Y. Remizov, A. P. Shkrabalyuk. 2008. On the nesting of the barn owl (Tyto alba (Scop.)) in Crimea. In: Recent Studies of Falcons and Owls. Materials of the 3rd International Scientific Conference. Kryvyi Rih, 55–58. [Ukrainian]
Voronetsky, V.N., Demyanchik, V.T. 1989. Artificial nests for owls. In: Methods of Studying and Protecting Birds of Prey (Methodical Recommendations). Moscow, 270–295. [Russian]
Wiacek, J., M. Niedzwiedz, S. Kowalchuk, M. Piskorski. 2009. Sklad pokormu plomykowki Tyto alba na wybranych stanowiskach w dolinie Wieprza I jego doplywow. In: Wiacek, J. [et al.]. (red.). Ptaki. Srodowisko. Zagrozenia. Ochrona. Wybrane aspekty ekologii ptakow LTO, Lublin, 105–114.
Zahorodnyi I., L. Romaniuk, O. Hnatyna, L. Pokrytiuk, I. Dykyy. 2021. Diet of the little Athene noctua (Scopoli, 1769) on the territory of Berehovo district (Transcarpathian region). Studia Biologica, 15 (4): 71–86. https://doi.org/10.30970/sbi.1504.670