乌鲁木齐市区越冬期长耳鸮的食性分析

2009～2011年间,利用食团分析法对乌鲁木齐市越冬长耳鸮(Asio otus)的食性进行分析。3年累计收集长耳鸮食团683份,辨认出1 132只猎物。分析结果表明,长耳鸮在冬季共捕食小型哺乳类6种,鸟类2种。小家鼠(Mus musculus)是最常见的食物,占总捕食量的53.45%。小型哺乳类是长耳鸮的主要食物,它在食物组成中出现的总频率为88.16%,以生物量计,小型哺乳类占食物构成的95.13%。长耳鸮的食物组成年度间差异显著,与当地猎物资源多样性和可获得性密切相关,表明长耳鸮可能采用机会主义者的捕食策略。

Winter Diet Analysis of Long-eared Owl (Asio otus) in Urumqi City

The diet of Long-eared Owl (Asio otus) was studied by checking pellets collected in Urumqi City, Xinjiang Uygur Autonomous Region, China. Total of 1 132 prey items were identified from 683 pellets in 3 winters of 2009 to 2011. Six small mammals and two species of bird were preyed. By checking the frequency of each food composition in pellet samples, we found that small mammals were the main food items, Mus musculus constituted 53.45% of the food items and was the most common species of prey. Small mammals accounted for 88.16% of food composition and contributed 95.13% biomass of in pellets. There were significant differences in the prey composition among years. It indicated that the difference of food items and predation rate of prey species were related to the availability of prey resources in the habitat and Long-eared Owls was an opportunism predator.