Trophic connections of the long-eared owl (Asio otus: Strigiformes) on the territory of south east of Ukraine
National Museum of Natural History at the NAS of Ukraine
15, Bohdan Khmelnitsky St., Kyiv 01601, Ukraine
Comparative analysis of composition and type of diet of two Long-eared owls' wintering groups in different geographical localities of southeastern Ukraine has been carried out. It has been shown, that on the territory of region-in-research it can be distinguished two main types of owls diet. On the Luganshina herbivorous micrommamals are prevail in owls diet, and main prey species ratio stay constant from year to year. In contrast, on the Donechchina seedvore micrommamals appears to be dominating group of nutrition in the owls diet, and main prey species ratio undergoes an observable annual fluctuations. It has been established, that first type of diet is normal for the Long-eared owl, and second one is caused by effects of difficult environments, notably by the dynamic of main owl's prey abundance – common vole. It has been revealed a regular changes of the Long-eared owl diet type when moving from North to South, which adequate to well known areas of harmfulness of voles.
Keywords: owls, diet selectivity, ecological groups, area of harmfulness