赤水河秋季浮游动物群落结构及其与环境因子关系

Community Structure of Zooplankton in Chishui River in Autumn and Its Relationship with Environmental Factors

[目的]研究赤水河流域浮游动物群落结构及其与环境因子的关系。[方法]于2018年9月对赤水河流域11个采样断面进行浮游动物采集和水环境因子测定。[结果]赤水河部分断面TN超标。赤水河共有浮游动物52种,轮虫种类最多(33种),原生动物11种,桡足类6种,枝角类最少(3种)。浮游动物优势种共7种,褐砂壳虫(Difflugia avellana)优势度指数最高,为0.204,枝角类不构成优势种。浮游动物密度、生物量、Margalef丰富度指数、Pielou′s均匀度指数和Shannon Wiener多样性指数平均值分别为34.61个/L、27.11μg/L、4.56、0.82和2.13。浮游动物群落结构空间差异显著。冗余分析结果显示,TN和SS是影响赤水河浮游动物群落结构的主要环境因子。[结论]该研究为赤水河流域健康管理提供数据补充。

[Objective]To study the community structure of zooplankton in Chishui River Basin and its relationship with environmental factors.[Method]In September 2018,the zooplankton collection and the determination of water environmental factors were carried out on 11 sampling sections of the Chishui River Basin.[Result]The concentration of TN exceeded the standard part of sections in Chishui River Basin.A total of 52 species of zooplankton were identified in the study area,most of them were rotiferas(33 species)having the highest abundance,of which 11 species as protozoa,6 species as copepoda,and only 3 of them as cladocera.7 dominant species were determined in Autumn,the most dominant species in protozoa was Difflugia avellana(Y=0.204),cladocera do not constitute a dominant species.The average values of zooplankton density,biomass,Margalef richness index,Pielou's evenness index and Shannon Wiener diversity index were 34.61 ind/L,27.11μg/L,4.56,0.82 and 2.13,respectively.There were significant spatial differences of zooplankton community structure in Chishui River Basin.The redundancy analysis showed that the most critical environmental factors affecting zooplankton community structure were total nitrogen and conductivity in autumn of Chishui River Basin.[Conclusion]The research provided data supplement for the health management of the Chishui River Basin.