关键词: 多溴二苯醚(PBDEs), 毒理效应, 环境暴露, 生物积累

Abstract: To understand the spatiotemporal variations of the food composition of wintering  Asio otus  in the urban and suburban areas of Beijing, the diets were collected monthly in the wintertime 2003-2006, with their composition analyzed. Among the three main preys in the urban and suburban areas of Beijing, bats occupied 41.6% and 43.0%, rodents occupied 27.5% and 39.4%, and birds occupied 30.7% and 18.9%, respectively. There were significant differences in the prey composition of A. otus  between the urban and suburban areas in the wintertime 2004-2005 and 2005-2006, and between early winter and late winter. In the same areas, the prey composition also showed significant differences among years and among wintering periods. It was suggested that the difference in the predation rates of prey species by the wintering A. otus   was related to the availability of prey resources in the habitats.

Key words: Polybrominated diphenyl ethers (PBDEs), Toxicological effect, Environmental exposure, Bioaccumulation