基于NMDS和RDA方法分析贵州百花水库后生浮游动物群落结构动态

为探究百花水库后生浮游动物群落结构特征，于2014年8月-2015年4月采用NMDS（非度量多维尺度分析）和RDA（冗余分析）方法，分析了水库后生浮游动物组成、季节演替规律及其群落与环境因子的相关性.结果表明:①百花水库共监测到后生浮游动物41种.其中，轮虫类28种，枝角类8种，桡足类5种；优势种为曲腿龟甲轮虫（Keratella valga）、螺形龟甲轮虫（Keratella cochlearis）、角突臂尾轮虫（Brachionus angularis）、圆筒异尾轮虫（Trichocerca cylindrica）、红多肢轮虫（Polyarthra remata）、中剑水蚤（Mesocyclops）、长额象鼻溞（Bosmina longirostris）.②NMDS结果显示，后生浮游动物群落结构呈明显的季节性差异.将群落结构演替划分为3个类群，即Ⅰ组（夏季、秋季组，以螺形龟甲轮虫、圆筒异尾轮虫等为优势种，共计8种）、Ⅱ组（冬季组，以螺形龟甲轮虫、长额象鼻溞等为优势种，共计7种）、Ⅲ组（春季组，以沟痕泡轮虫和红多肢轮虫等为优势种，共计7种）.③RDA结果表明，百花水库后生浮游动物群落结构变化受水环境因子影响较为明显，整体上WT（水温）、pH、ρ（TP）和ρ（NO₃--N）是影响百花水库后生浮游动物群落结构变化的主要因素.研究显示，根据后生浮游动物优势种及现存量（丰度、生物量）大小，可以判定百花水库后生浮游动物群落结构具有明显的季节性差异. 

Analysis of Structure and Dynamics of Metazooplankton Community in Baihua Reservoir of Guizhou Province based on NMDS and RDA

To study the dynamic characteristics of metazooplankton community in Baihua Reservoir, the composition, seasonal succession, community and environmental factors of metazooplankton were analyzed from August 2014 to April 2015 with the non-metric multidimensional scaling measurement (NMDS) and Redundancy analysis (RDA). A total of 41 metazooplankton species were identified, including 28 species of rotifers, 8 species of cladocerans and 5 species of copepod. According to the abundance and occurrence, Keratella valga, Keratella cochlearis, Brachionus angularis, Trichocerca cylindrical, Polyarthra remata, Mesocyclops, Bosmina longirostris were the dominant species. NMDS measurement demonstrated that seasonal community structure of zooplankton was significant different. The community structure succession was divided into three groups, Group Ⅰ (summer and autumn group, the dominant species were Keratella cochlearis and Trichocerca cylindrica, among a total of 8 species), Group Ⅱ (winter group, the main species were Keratella cochlearis and Bosmina longirostris, among a total of 7 species), Group Ⅲ (spring group, the dominant species were Pompholyx sulcata and Polyarthra remata, among a total of 7 species). RDA analysis illustrated that WT, TP and NO₃--N were the main factors influencing the community structure of metazooplankton in Baihua Reservoir. The results showed that the dominant species of metazooplankton and the size of existing stocks (abundance and biomass), it revealed that the structure of metazooplankton in Baihua Reservoir has significant seasonal differences.