【摘要】 为了解重庆市云阳县彭溪河流域浮游动物群落结构及其与水体盐碱度的关系，于2023年6月开展了云阳县彭溪河浮游动物生物多样性研究，共鉴定出浮游动物4纲5类31种，包括22种枝角类、4种轮虫类、3种桡足类、1种昆虫类和1种寡毛类，总密度70.8～270 ind./L,总生物量1.13～4.02 mg/L,其中枝角类的物种数量最多，密度最大，物种多样性水平明显高于其他物种。各样点浮游动物的Shannon-Wiener多样性指数和Pielou均匀度指数分别为0.919～2.335和0.300～0.780,干流与支流河口位置对2类指数的影响较大。浮游动物优势种有7种，其中剑水蚤、猛水蚤与泥溞在生境选择上较为相似，生态位重叠度较高。整体而言，全盐量、总碱度和总磷是影响云阳澎溪河浮游动物群落结构变化的主要环境因子。水体营养盐在一定程度上减缓了盐碱度对浮游动物生长的限制。因此控制流域内盐类污染物的输入，对该流域浮游动物群落结构的稳定性至关重要。更多还原

【Abstract】 In order to investigate the structure of zooplankton community in Pengxi River basin, Yunyang County, Chongqing and clarify its correlation with saline-alkali of the water body, a study on zooplankton biodiversity was carried out in June 2023. The results showed that 31 species of zooplankton belonging to 4 classes were collected, including 22 species of Cladocera, 4 species of Rotifer, 3 species of Copepod, 1 species of insect, and 1 species of Oligochaeta. The total density was 70.8 ind./L to 270 ind./L, and the total biomass was 1.13 mg/L to 4.02 mg/L; among which Cladocera was the most abundant, and the level of species diversity was significantly higher than that of other species. The Shannon-Wiener diversity index and Pielou evenness index of zooplankton ranged from 0.919 to 2.335, and 0.300 to 0.780, respectively. 7 dominant species were found, among which Cyclops, Harpacticoida, and Daphnia vulgaris were similar in habitat selection and had higher niche overlap. The results of correlation analysis showed that total salinity, total alkalinity, and total phosphorus were the main environmental factors affecting the changes in zooplankton community structure. To some extent, the nutrients of water might mitigate the alkalinity and salinity constraints for some zooplankton. Therefore, controlling the input of salt pollutants in the basin was crucial to maintaining the stability of the zooplankton community structure in the basin.更多还原