春、秋季武湖浮游动物群落特征及其与环境因子的关系

2007年和2008年春(5月)、秋(11月)季对武湖浮游动物进行了4次调查,共检出浮游动物133种,其中原生动物61种,轮虫63种,枝角类6种,桡足类3种。浮游动物物种数春季较多,2007年和2008年分别为86种和85种;秋季较少,分别为73种和72种。2007年春季浮游动物总丰度最高,为49605个/L;2007年秋季和2008年春、秋季浮游动物总丰度较低;原生动物和轮虫的丰度是武湖浮游动物丰度的主体。浮游动物丰度和环境因子的典型对应分析(CCA)表明,叶绿素a、总磷、总氮、化学需氧量、溶解氧、水温和透明度是与武湖浮游动物群落相关性较强的环境因子(P<0.05),且相关性较强的环境因子在各季节是不同的,表明武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。

Characteristics of Zooplankton Community and Its Relation to Environmental Factors in Lake Wuhu in Spring and Autumn

Investigations of zooplankton were carried out during four surveys of Lake Wuhu in spring (May) and autumn (November) of 2007 and 2008. Totally, 133 species of zooplankton including 61 species of protozoa, 63 species of rotifers, 6 species of cladocerans, and 3 species of copepods were found. The number of zooplankton species of spring (86 and 85) were higher than autumn (73 and 72). The density of zooplankton was the highest in spring of 2007 (49605 ind./L); autumn of 2007, spring and autumn of 2008 had low density of zooplankton, and the abundance of protozoa and rotifer were on predominance. The zooplankton community were analyzed in relation to water quality parameters by canonical correspondence analysis (CCA). Temperature, transparency and the concentrations of Chl a, TP, TN, COD and DO were strongly correlated with the zooplankton community. The parameters that demonstrated a strong correlation to the zooplankton community differed among seasons, suggesting that the seasonal variations of zooplankton community structure was related closely to the water trophic status.