Colonial wintering of Long-eared owl (Asio otus) in Botoșani County (N-E Romania)
DOI:
https://doi.org/10.24193/subbbiol.2020.1.07Keywords:
phenology, tree selection, anthropogenic impact.Abstract
This study explores the phenological aspects and distribution of long-eared owl (Asio otus) colonies in Botoșani county, N-E Romania. The anthropogenic impact was also evaluated and analyzed and the microhabitat where the colonies are located. Data was collected between November 2018 and February 2019. 9 settlements in Botoșani county, including the municipality of Botoșani, were investigated. Data about temperature, the size of the colony, the tree species where the colony is located and anthropogenic impact, were collected. 9 colonies were identified with a total of 340 individuals. Two short-eared owl (Asio flammeus) were identified in one of the colonies. The maximum number (51) of specimens is reached in the months of January and February, and the minimum number (30) in the months of November and December. It has been observed that when the temperatures tend to fall, the size of the colonies register significant growth. The preferred species of trees are gymnosperms (69%), the owls were found on angiosperms as well (31%). The preference for the coniferous species increases along with the drop in temperatures and the increase in rainfall or snowfall, as these types of trees offer better protection against the weather conditions. We noticed that the anthropogenic factor has a significant influence on the colonies of Asio otus, so we wanted to grade it with the help of a scale from 1 to 7. Grade 1 was given in only one locality (Știubieni), grade 2 was registered in 4 points (Dorohoi, Avrămeni, Botoșani, and Roma), grade 3 is found only in Bucecea, Corlăteni registers a grade of 4, while in Dobârceni the registered value is 5, grade 6 is met only in Săveni. Grade 7 represented the stage in which there is a decrease in the population of Asio otus, or the death of individuals for various reasons, a situation that has not been encountered.
References
Chiba, A., Onojima, M., & Tohru, K. (2005). Prey of the Long-eared Owl Asio otus in the suburbs of Niigata City, central Japan, as revealed by pellet analysis. Ornithol. Sci., 4, 169–172.
Cramp, S. (1985). The Birds of the Western Palearctic. Vol. 4. Ed. Oxford University Press Oxford.
Cramp, S., & Simmons, K. (1985). The Birds of the Western Palearctic. Vol. 4. Ed. Oxford University Press Oxford, pp. 970.
Galli, L., Baroni, D., Gelli, I., Launo, S., Puppo, C., & Rossi, R. (2015). Data about Long-eared owl Asio otus diet in a winter roost in Imperia (Western Liguria, North Italy) and notes on their daily activity cycle. Boll. Mus. Ist. Biol. Univ. Genova, 77, 72-83.
Gryz, J., & Gryz, D.K. (2015). Seasonal variability in the diet of the long-eared owl Asio otus in a mosaic of field and forest habitats in central Poland. Acta Zool. Cracov., 58(2), 173-180.
Ionescu, D.T., Hodor, C., & Sándor, A.D. (2017). Diet of Wintering Short-eared Owl Asio flammeus (Pontoppidan, 1763) (Strigiformes: Strigidae) in South-Eastern Romania. Acta Zool. Bulg., 69(2), 295-297.
König, C., & Weick, F. (2008). Owls of the World. Ed. Christopher Helm London, pp. 528.
Kucherenko, V., & Kalinovsky, P. (2018). Winter Roost Tree Selection and Phenology of the Long-Eared Owl (Asio otus) in Crimea. Diversity, 10(4), 105.
Laiu, L., Paşol, P., & Murariu, D. (2003). Winter food of the Long eared Owl (Asio otus otus L.) in the rural environment (Romania). Travaux du Muséum National d’Histoire naturelle "Grigore Antipa”, 45, 365 - 372.
Lövy, M., & Riegert, J. (2013). Home Range and Land Use of Urban Long-eared Owls. The Condor, 115(3), 551-557.
Marks, J.S., Evans, D.L., & Holt, D.W. (1994). Long-eared Owl (Asio otus), In: The Birds of North America, Poole, A., & Gill, F. (eds.), The Academy of Natural Sciences, Philadelphia and American Ornithologists’ Union, Washington D.C.
Mestecaneanu, A., & Gava, R. (2015). The evaluation of the strength of Long-eared Owl (Asio otus) that wintered in the Arges country (2014–2015). Curr. Trends Nat. Sci., 4: 56–65.
Mititelu, D., & Chifu, T. (1994). Flora și vegetația județului Botoșani. Stud. Comunic. Muz. Bacău, 13, 109-126.
Moga, C.I., David, A., Harteli, T., & Coroiu, I. (2005). Trophic spectrum of long-eared owl Asio otus during a winter lacking significant snow cover. Biota, 6: 43-48.
Møller, A.P., Fiedler, W., & Berthold P. (2010). Effects of Climate Change on Birds. Ed. Oxford University Press Oxford.
Nistreanu, V., & Postolachi, V. (2011). Trophic spectrum of long-eared owl (ASIO OTUS OTUS L.) in nesting period. Studii şi comunicări, Compl. Muz. Şt. Nat. Ion Borcea, Bacău, 24, 76 – 79.
Papp, T., & Sándor A.D. (2007). Arii de Importanţă Avifaunistică din România/ Important Bird Areas in Romania. Ed. Societatea Ornitologică Română & Asociaţia pentru Protecţia Păsărilor şi a Naturii „Grupul Milvus” Târgu Mureş, pp. 252.
Pirovano, A., Rubolini, D., & Michelis, S. (2000). Winter roost occupancy and behavior at evening departure of urban Long-eared Owls. Ital. J. Zool., 67(1), 63–66.
Rang, P.C. (2002). Studiul dinamicii unor comunități de păsări din bazinul mijlociu al râului Siret incluzând zonele lacurilor de acumulare. Ed. Societatea Ornitologică Română Cluj-Napoca, pp. 33-38.
Sharikov, A.V., Makarova, T.V., & Ganova, E.V. (2014). Long-term dynamics of Long-eared Owls Asio otus at a northern winter roost in European Russia. Ardea, 101(2), 171–176.
Varvara, M., & Apostol, E. (2008). Diversity and the main ecological requirements of the epigeic species of carabidae (COLEOPTERA, CARABIDAE) in the sun flower ecosystem, Broscăuţi (BOTOŞANI COUNTY). Analele Ştiinţifice ale Universităţii „Al. I. Cuza” Iaşi, s. Biologie Animală, 54, 81-89.
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