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Winter Diets of Long-Eared Owl (Asio otus) in Thrace, Turkey

Beskardes Vedat, Bacak Ergun, Keten Akif, Arslangundogdu Zeynel

Polish Journal of Ecology

2020

Vol. 68, nr 3

242--250

Long-eared owls (Asio otus) are common avian predators in Turkey. Their diet consists primarily of small mammals, but they also feed on bats, birds, amphibians, reptiles, insects, and fish. Limited research has been conducted on long-eared owl diets and pellet characteristics in Turkey, yet this knowledge would improve our understanding of their ecological role in the environment. We investigated prey items in pellets at winter sites of Asio otus in Edirne, Kirklareli, Tekirdag, and Istanbul. We collected 2143 pellets from winter sites and counted 3458 prey items. We identified 30 taxa including 16 mammals, 12 birds and 2 insects. Asio otus primarily consumed small mammal species (97.9%) which consisted mainly of rodents (89.6%, including Cricetidae 45.95%, Muridae 43.7%), Eulipotyphla (1.2%), and unidentified mammals (7.1%). A small proportion of birds (1.9%) and insects (0.2%) also were consumed. Asio otus inhabited small coniferous woodlands at edge of farmlands during winter, but their diet varied with location. Muridae were primarily consumed in Istanbul and Tekirdag, whereas Cricetidae were mostly consumed in Kırklareli and Edirne. Our study shows that Asio otus feeding habits shift depending on prey abundance and that they are not specialists for Microtus species only.

Small Mammals in an Urban Area : Habitat Preferences and Urban-Rural Gradient in Nitra City, Slovakia

Klimant P., Klimantová A., Baláž I., Jakab I., Tulis F., Rybanský L., Vadel L., Krumpálová Z.

Polish Journal of Ecology

2017

Vol. 65, nr 1

144--157

The small mammal species were investigated in the urbanized environment of Nitra city (Slovakia) in a multiscale-approach: at habitat level and at landscape level (urban-rural gradient). Continuous comprehensive rodent samplings from 2012 to 2015 were conducted in ten study sites, classified into three urban zones (landscape level). The total effort comprised 1,250 specimens of 13 species (Microtus arvalis, Apodemus sylvaticus, A. flavicollis, A. uralensis, Clethrionomys (Myodes) glareolus, M. subterraneus, Micromys minutes, Mus spicilegus, M. musculus, Crocidura suaveolens, C. leucodon, Sorex araneus, S. minutus) gathered in 14950 trapxnights. Environmental variables (habitat level) at each site were processed in the Geographical Information System as a proportion of landscape units around the trapping line and by a phytosociological survey. At the habitat level, we found a relationship between the landscape habitat structure and each species of small mammals. Diversity, species richness and relative abundance of small mammals decreased with the density of the built-up area. At landscape level, urban zones had a significant influence on species diversity, richness and relative abundance of small mammal populations. On the other hand, the presence of small mammal species precisely determined the urban zones, where we identified seven indicative species.