Date of this Version
Erforschung biologischer Ressourcen der Mongolei (2016) band 13: 301-311. Results of the Mongolian-German Biological Expeditions since 1962, No. 337.
New materials of 10 Eagle owl Bubo bubo localities from Mongolia were analyzed. Feeding ecology of Long-eared owl Asio otus could be studied by investigation of pellets from 4 roosting or nesting places in S-Mongolia. All together in the prey of Bubo bubo were analysed 1098 vertebrates (1017 mammals, 39 birds, 41 reptiles 1 fish), involved about 22 mammal species. In the pellets were dominant Lagomorpha with 23.3 % in SW-Mongolia, Dipodidae in W-, SW- and S-Mongolia (37.3 %, 23.4 %, 30.2 %), Cricetidae in SW- and S-Mongolia (13.6 %, 17.6 %), Gerbillidae in W- and S-Mongolia (19 %, 32. 1%) and Arvicolidae in W- and SW-Mongolia (23.8%, 23.8%). The percentage of birds was registered between 3.2 and 4.5 %. Rests of evertebrates (Arachnida, Solifugae, Scorpiones, Coleoptera, Orthoptera) were noticed in rare cases. For Asio otus 747 vertebrates (726 mammals, 12 birds, 9 reptiles) as prey were determined. There were analysed about 13 mammal species. In the prey of the Longeard Owl are dominant the small Cricetidae species (Cricetulus and Phodopus with 50.5 %) as well as Gerbillidae (Meriones spec. 29 %) and the small Dipodidae (Salpingotus and Cardiocranius) with 12.3 %.
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