engleski

Ishrana zimujućih malih ušara Asio otus u Županjskoj Posavini

The study presents the diet of the Long-eared Owl at wintering roosts in rural areas of Strošinci, Drenovci, Bošnjaci and Županja in Županjska Posavina. The total of 1, 073 pellets were collected during the winter of 2014/2015 ; they contained remains of 2, 473 specimens belonging to 13 species of small mammals and two bird species. The average number of prey per pellet was 2.36. The majority of small mammal species belonged to the Arvicolinae and Murinae subfamilies, with Common Vole Microtus arvalis being the most dominant species represented in the diet (76.1%). The food niche of the Long-eared Owl measured by standardized Levin’s index of niche breadth was the widest (0.07) in Strošinci, and the narrowest (0.02) in Bošnjaci. The Shannon–Wiener’s measure of diet niche breadth varied between 1.12 (Strošinci) and 0.58 (Bošnjaci). According to the Bray–Curtis index, the highest percentage overlap of prey composition (86.56%) was between Županja and Bošnjaci. Županjska Posavina was hit with catastrophic floods during the summer of 2014. A comparison among flooded and not flooded areas showed no statistically significant difference in the prey composition of the wintering Long-eared Owl in studied areas.

long-eared owl ; wintering ; diet

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