独龙江流域冬季鱼类多样性及其分布特点

Fish Biodiversity and Its Distributional Characters During Winter in the Dulong River Basin, Yunnan, China

摘要: 2004年10—11月，对独龙江的鱼类资源进行了调查，根据不同的海拔及生境在整个独龙江流域共计设置了26个采样点，采集鱼类标本883号。对各采集点渔获物的统计分析的结果显示：(1)独龙江干流、支流的鱼类生物量、物种多样性，随海拔的上升呈下降趋势；(2)干流的Shannon-Wiener指数、物种均匀性指数均高于支流；(3)除了独龙裂腹鱼、大鳍异齿yan在整个独龙江流域均有分布外，其余5种鱼类的分布与海拔因子的变化有明显的关系。

Abstract: The authors investigated the fish resources in the Dulong River, Irrawaddy basin from October to November, 2004. Twenty six sampling sites were established and 883 fish specimens were collected in different altitudes and habitats. The analysis revealed that: (1) the fish biomass in both the main stream and its tributaries descend when the altitude ascends; (2) fish species diversity descends when the altitude ascends. The Shannon-Wiener index and the species evenness in the main stream are higher than those in the tributaries; (3) except for Schizothorax (Schizothorax) dulongensis and Oreoglanis macropterus, the occurrences of all the other five species are significantly related to the changes in altitude.