文章基本信息

标题：Diet Overlap between the Endemic Fish Anabarilius grahami (Cyprinidae) and the Exotic Noodlefish Neosalanx taihuensis (Salangidae) in Lake Fuxian, China
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作者：Jianhui Qin ; Jun Xu ; Ping Xie 等
期刊名称：Journal of Freshwater Ecology
印刷版ISSN：0270-5060
电子版ISSN：2156-6941
出版年度：2007
卷号：22
期号：3
页码：365-370
DOI：10.1080/02705060.2007.9664165
出版社：Taylor & Francis
摘要：We studied diet composition and overlap of the exotic noodlefish (Neosalanx taihuensis) and the endemic fish Anabarilius grahami in a deep, oligotrophic lake in the Yunnan Plateau. A. grahami dominated the fish community in Lake Fuxian before the invasion of N. taihuensis in 1982, but it is now in the process of extinction, corresponding with an explosive increase in N. taihuensis population. Schoener's index ( =0.773) indicate that N. taihuensis and A. grahami have significant diet overlap, with both fish feeding mainly on zooplankton. An increased proportion of littoral prey, such as Procladius spp., Coleoptera, and epiphytes, in the diet of A. grahami indicated that this endemic fish shifted its main habitat from the off-shore zone in the late 1980s to the littoral zone at the present. A difference in reproduction between the two fishes, along with the overfishing, may have exacerbated the occupation of A. grahami's pelagic niche by N. taihuensis. The endemic species has shown large competitive disadvantage for food and space in the presence of N. taihuensis.