巢湖流域河流鱼类群落的时空分布

基于2013年4月和10月对巢湖流域66个河道样点的调查数据,初步研究了巢湖流域河流鱼类群落的时空变化特征。主要研究结果显示,鱼类多样性无显著性的水系间、生态分区间的变化,但随季节和河流级别显著变化:10月份的个体数显著高于4月份,2级河流的物种数和个体数均显著大于1级、3级和4级河流。鱼类群落结构的季节动态显著,随生态分区显著变化,但不受水系、河流级别的显著影响。在二级生态分区水平上,仅西南森林生态亚区的鱼类群落结构与其他5个生态亚区的显著差异;宽鳍鱲、吻虾虎鱼等在西南森林生态亚区具有更高多度,而鲫、鰐、鲤等物种在其他生态亚区多度更高。

SPATIAL AND TEMPORAL PATTERNS OF FISH ASSEMBLAGES IN THE RIVERS OF CHAOHU BASIN

Based on the data collected from 66 sampling sites within the rivers of the Chaohu basin during April and October, 2013, the spatio-temporal variations in fish assemblages were examined in this study. Our results showed that fish species diversity did not vary among rivers and ecoregions but differed significantly across seasons and stream orders. Fish abundance collected in October was more than that in April. The highest species richness and fish abundance were observed in the second-order streams, significantly higher than that in the first-, third- and fourth-order streams. Fish assemblage structures showed significant difference across seasons and ecoregions, respectively, but did not differ significantly among rivers and stream orders. When looking at the sub-ecoregion scale, significant difference in fish assemblage structures was only observed between the West-southern Forest Sub-ecoregion and the other five sub-ecoregions, while that among the other five sub-ecoregions showed no significant variation. Zacco platypus and Ctenogobius spp. were more abundant and frequent in the West-southern Forest Sub-ecoregion, while Carassius auratus, Hemiculter leucisculus and Cyprinus carpio were more abundant and frequent in other sub-ecoregions.