南岭南部北江源地鱼类区系及东洋区北侧界的划分

STUDIES ON THE FISH FAUNA AND DIVIDING LINE AT THE NORTH OF ORIENTAL REGION IN THE SOURCE OF BEI-JIANG RIVER ON THE SOUTH OF NAN-LING

在浈水上游北江源地亚历河采集到鱼类 4 0种和亚种 ,分隶于 5目 13科 31属。以骨鳔类为主 ,其中鲤形目种类占 6 7.5 % ,鲤科占鲤形目的 70 .4 9% ,既有老第三纪原始类群的后裔种类 ,又有南亚暖水性鱼类。东陂拟腹吸鳅 ,侧条光唇鱼 ,宽鳍鱼鼠等适应山溪急流生活的生态类群占明显优势 ,亚历河的鱼类区系东洋区的特征比较明显 ;根据鱼巴亚科占鲤科类 31.5 8% ,以及东洋区鱼类占全部种类的 36 .2 4 % ,而鳊、鲴、鱼句、鲢、雅罗鱼五亚科种类仅占2 6 .33%等特征 ,认为将南岭作为全北区与东洋区的分界线更符合客观事实。鱼类数量呈明显下降趋势 ,人工繁育开发新水产品种是重要的保护措施之一。

Fourty species (sub-species) fishs which belong to 5 orders, 13 families and 31 jenus are collected from source of Bei-jiang River on upper reaches of Zhen River,Cypriniformes is 67.5%, Cyprinidae is 70.49% in Cypriniformes.Characters of Oriental Region in the fauna of Ya-Li River are reported. Based on the data collected from the compositions of fishes in the area, the fact shows that the dividing line of Oriental Region and Holarictic Region should be in Nan-Ling Mountains range but not Qin-ling Moumtain range.