关键词: 长耳鸮, 越冬期, 鼠类, 北京市

Abstract: Objective Analyzing the prey rodent species components of wintering Asio otus and evaluating the special-temporal dynamics of the predation rates on these species.Methods The food pellets of the wintering Asio otus were collected from urban parks and suburb area of Beijing from 2003 to 2006.The content of the pellets were observed directly and the rodent species and numbers were identified and recorded.Results Totally 7 rodent species were found as prey of the wintering Asio otus.There were no differences for the species components between urban and suburb samples,and among 3 time periods.The predation rates of the Norway rat,house mouse and striped field mouse changed with time,of which the form two species were the main prey.Conclusion The wintering Asio otus took Norway rat and house mouse as main food.The dynamics of predation rates for rodents concordant with the special-temporal changes of wild rodents at urban and suburb area.