Micromammals in the diet of the Long-eared Owl ( Asio otus ) at the W.W.F.'s Oasi San Giuliano (Matera, South Italy)

摘要: Abstract The presence of small mammals in the winter diet a dormitory made up 5 specimens living at WWF's Oasi San Giuliano (province Matera) is analysed following study. data confirm mammals, Microtinae particular, as main prey Long-eared Owl. 1921 prey-individuals totalling 37695 grams biomass were found. Rodentia are dominant (86.93% biomass); Microtus savii particular importance and represents 61.06% total was found 60.42% pellets second most frequently hunted species Apodemus sp.: 24.06% biomass, 37.08% frequency. other preyed on ( Suncus etruscu s, Crocidura sp., Pipistrellus Vespertilius Rattus Moscardinus avellanarius ) little importance: 1.27% biomass. owls upon 9 11 present (the Talpa sp. Mus domesticus absent). Affinity among different periods, estimated through Sorensen's Index, to be medium-high (0.67-0.72). analysis confirms stenophagy Owl, this area that characterised by extensive cereal cultivation few shrubs trees. In comparison with Italian localities, greater number recorded (8 birds, 1 insect). Roost mainly Chiroptera (0.36% compared 0.1-0.2). Myotis capaccinii also Owl for first time Italy.