西泉眼水库春季浮游动物群落结构及其与水环境因子相关性分析

Community Structure of Zooplankton in Spring and Its Relationship with Water Environmental Factors in Xiquanyan Reservoir

摘要: 为了解西泉眼水库春季的水体浮游动物群落结构特征及其与水环境因子之间的关系，于2021年5月在水库内采用内陆水域大面积定点调查方法共设置了18个采样点，并进行浮游动物的采集和水体理化因子的测定。本文运用了优势种、生物多样性指数、RDA (冗余分析)等方法对浮游动物及水环境因子进行分析。结果共鉴定出浮游动物24种，其中轮虫最多为15种，占整个浮游动物群落的70.83%，原生动物7种，占整个浮游动物群落的29.16%，枝角类和桡足类均只发现1种；优势种主要包括团球领鞭虫(Sphaeroeca)、螺形龟甲轮虫(Keratella cochlearis)和无节幼体(Nauplii)3种；香农维纳指数平均值为1.04、均匀度指数平均值为0.73，评价结果显示春季西泉眼水库呈轻–中污染。冗余分析结果表明水温、TP、COD和PH是影响浮游动物群落变化的主要水环境因子。

Abstract: To understand the community structure characteristics of zooplankton and its relationship with water environmental factors in spring in Xiquanyan Reservoir, a large-scale survey was conducted in the inland waters of the reservoir in May 2021, and a total of 18 sampling sites were set up. Zoo-plankton were collected and chemical factors were measured. In this study, dominant species, bi-odiversity index and RDA (redundancy analysis) were used to analyze zooplankton and aquatic environmental factors. The results show that a total of 24 species of zooplankton were identified, including 15 species of rotifers (70.83%), 7 species of protozoa (29.16%), 1 species of cladicornis and 1 species of copepods. The dominant species were Sphaeroeca, Keratella cochlearis and Nauplii. The average shannon Wiener index is 1.04 and the average pielou index is 0.73. The evaluation results show that the Xiquanyan reservoir is light-medium polluted in spring. The results of re-dundancy analysis showed that water temperature,TP, COD and PH were the main water envi-ronmental factors affecting the changes of zooplankton community.