Frog community responses to recent American bullfrog invasions  

作　　者：Yiming LI Zhunwei KE Yihua WANG Tim M. BLACKBURN 

机构地区：[1]Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, The Chinese Academy of Sciences, Chao yang District, Beijing 100101, China [2]Graduate University of the Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100039, China [3]Institute of Zoology, ZSL, Regent's Park, London, NW1 4RY, United Kingdom

出　　处：《Current Zoology》2011年第1期83-92,共10页动物学报（英文版）

基　　金：Acknowledgements We thank Feng XU and Yanping WANG for helping a part of field works and Richard Duncan for comments on the manuscript. This work was supported by a grant from National Science foundation （No. 30870312） and by a grant from the ＂973＂ program （No. 2007CB411600）.

摘　　要：Native species may decline quickly when confronted with an exotic species to which they are not adapted. The extent of decline may depend on the abundance of an invader and the length of time since it first arrived in the community （residence time）, and the interaction between these two variables. We tested these effects using data on the effects of American bullfrog Lithobates catesbeianus invasion on native frog communities in 65 permanent lentic waters on islands in the Zhoushan Archipel- ago, China. We examined variation in native frog abundance and species richness in relation to features of the American bullfrog invasion, habitat disturbance, characteristics of the water body and fish communities and the presence of red swamp crayfish. Bullfrog invaded sites had lower native frog density and species richness, higher submerged vegetation cover and greater fre- quency of repairs to the water body than did non-invaded sites. The minimum adequate general linear mixed models showed that both native frog density and species richness were negatively related to post-metamorphosis bullfrog density, and that native frog species richness was also positively related to the vegetation cover. There was no effect on either native frog density or species richness of residence time or its interaction with bullfrog density, or of the abundance of bullfrog tadpoles. The results suggested that post-metamorphosis bullfrogs had impacts on native frog communities in the islands, and that the extents of these impacts are proportional to post-metamorphosis bullfrog density

关 键 词：Invader abundance Residence time Impact .American bullfrog Native frog decline 

分 类 号：S966.31[农业科学—水产养殖] S966.3[农业科学—水产科学]