滴水湖浮游动物群落结构及其与环境因子的关系

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 滴水湖浮游动物群落结构及其与环境因子的关系 DOI: 10.5846/stxb201303010332 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: Zooplankton community structure and its relationship with environmental factors in Dishui Lake Author: Affiliation: Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:为研究上海市滴水湖浮游动物群落结构及其与环境因子的关系,于2012年1-12月对滴水湖进行了一年调查采样。共检出浮游动物33属61种,其中轮虫22属45种,枝角类4属7种,桡足类7属9种。优势种包括10种轮虫,桡足类为中华窄腹剑水蚤(Limnoithona sinensis)和无节幼体,枝角类不形成优势种。浮游动物年均密度为1200个/L,年均生物量为1.67mg/L,种类数、密度和生物量均为春夏两季相对较高。Shannon-Wiener多样性指数H'和Margalef丰富度指数D年均值分别为1.61和1.01,多样性季节差异显著而各样点间差异不显著。相关性分析和多元回归分析显示,水温是影响滴水湖浮游动物群落结构变化的决定性因子,冗余分析(RDA)显示TN、TP、叶绿素a和pH也是影响浮游动物群落变化的重要因素,表明滴水湖浮游动物群落结构的季节变化与水体营养状况密切相关。综合运用水质理化因子、综合营养状态指数、多样性指数及浮游动物优势种对滴水湖进行水质污染水平和富营养化评价,得出2012年滴水湖水质状况属于α-中污型,营养程度为中富营养水平。 Abstract:Dishui Lake is the largest artificial lake in Shanghai, China. Water in the lake comes from the Huangpu River via the Dazhi River through surrounding river networks, accepts surface runoff and passes through a sluice into the East China Sea. The lake is important for flood control, drainage, water replacement and other functions, and is critical to the Lin'gang New District's landscape and to Shanghai's eco-city construction. It is a newly formed lake with a fragile ecosystem and could easily be affected by external pollutant sources. Zooplankton play an important role in lake ecosystems and biological productivity at the base of the food chain since they eat phytoplankton, bacteria and detritus and provide food for fish and other aquatic organisms. Filter-feeding fish were put into the lake in recent years to control phytoplankton numbers, but a growing filter-feeding fish population could harm the zooplankton community. Consequently, long-term monitoring of variation in the zooplankton community is vital to the health of Dishui Lake. In order to explore the relationship between zooplankton community structure and environmental factors in Dishui Lake, we investigated the species composition, density and biomass distribution, dominant species of zooplankton and water quality parameters in Dishui Lake. We used eight sampling sites and took samples monthly from January to December, 2012. We identified 61 species belonging to 33 genera, including 45 Rotifera belonging to 22 genera, 7 Cladocera belonging to 4 genera and 9 Copepoda belonging to 7 genera., Dominant species included Copepoda species Limnoithona sinensis and nauplii, ten Rotifera species, while Cladocera had no dominant species. Dominant species were different in each season. The annual average density of zooplankton was 1200 ind./L and the annual average biomass was 1.67mg/L. Zooplankton species number, density and biomass were all higher in spring and summer than in autumn and winter. The annual average of Shannon-Wiener and Margalef diversity indices were 1.61 and 1.01 respectively. Both of these diversity indices were significantly different in different seasons, but not significantly different between the eight sampling sites. Pearson Correlation analysis, Multiple Regression Analysis and Redundancy analysis (RDA) of species number, density and biomass of zooplankton and environmental factors displayed a significant relationship between zooplankton community and environmental factors. This indicated that the seasonal variation of zooplankton community structures in Dishui Lake was closely related to the water eutrophication status. Water temperature was a key factor in variation in the zooplankton community structure, and chlorophyll a, pH, total nitrogen (TN) and total phosphorus (TP) were also important factors. Zooplankton species number, density and biomass increased with a rise in water temperature and a decline in pH. TN increased the density and biomass, but excess TP tended to reduce the number of species present. Several methods were used to assess the water quality and eutrophication levels. Results showed that the water quality status of Dishui Lake in 2012 could be classified as α-mesosaprobic and its eutrophication level was at semi-eutrophic levels under a comprehensive application of the water quality index, trophic level index (TLI) and diversity indices assessment methods. 参考文献 相似文献 引证文献