Seasonal variation of small mammals in the diet of the barn owl ( Tyto alba ) in the Drinos River valley, southern Albania

摘要: The small mammal composition in the diet of barn owls from Drinos River valley, southern Albania, was studied over period 1 year (September 2010-September 2011). A total 662 pellets collected and analyzed, 1951 prey items were identified. Fourteen different species identified (5 insectivores 9 rodents), among which Microtus thomasi (frequency, F = 32.9%; biomass, B 45.5%), Crocidura suaveolens (F 23.5%; 9.4%), Mus macedonicus 17.8%; 16.3%) most abundant. In winter, Rattus rattus increased significantly consumed biomass (18.1%), while spring Apodemus sylvaticus (9.4%) ranked third common species. Neomys anomalus more frequent autumn winter than summer. Suncus etruscus had low percentages owl diet, but preyed upon during all seasons, confirming presence valley. Significant seasonal variations mammals detected. Environmental index (i/r) values indicate that valley is mainly an agrocenosis nonintensive land-use practices.