浙江两类饮用水源地浮游动物种类组成及其类群相关性分析

于2009年7月至2010年4月,在浙江省选取了10个水库和10个河网饮用水源地,进行4个季节的浮游动物采样调查。记录浮游动物101种(轮虫60,枝角类24和桡足类17种)。水库和河网轮虫的优势种分别为角突臂尾轮虫(Brachionusangularis)和针簇多肢轮虫(Polyarthra trigla),枝角类分别为颈沟基合溞(Bosminopsis deitersi)和长额象鼻溞(Bosminalongirostris),桡足类均为温剑水蚤(Thermocyclops)。水库中有一些能指示良好生态或水质的指示性种类。水库枝角类与桡足类群落之间周年在丰度和生物量上均有极显著的正相关关系(P<0.01),轮虫与桡足类类群之间的相关性最弱;河网枝角类与桡足类在夏、秋、冬季有显著的正相关性(P<0.05)。浮游动物类群之间的相关性程度,以水库的秋季与河网的夏季为最高。轮虫与浮游甲壳动物的种类丰富度随着饮用水源水体透明度的变化呈现相反的变化趋势。

Comparison of species composition and assemblage concordance of zooplankton between two types of drinking water sources in Zhejiang province

Zooplankton from two types of drinking water sources(10 reservoirs and 10 rivers) in Zhejiang province were sampled during four seasons from July,2009 to April,2010.101 species of zooplankton(60 Rotifera,24 Cladocera and 17 Copepoda) were found.Brachionus angularis(Rotifera) and Bosminopsis deitersi(Cladocera) dominated in reservoirs,whereas Polyarthra trigla(Rotifera) and Bosmina longirostris(Cladocera) dominated in the rivers,Thermocyclops(Copepoda) dominated both in reservoirs and rivers.Highest assemblage concordance was observed between cladocerans and copepods in the reservoirs with higher water transparency across one yea(r P<0.01),while the lowest level of concordance was detected between copepods and rotifers.In summer,autumn and winter,there had positively relationships between cladocerans and copepods in the rivers with lower water transparency(P<0.05).Strong relationships among zooplankton groups were found in Autumn for the reservoirs and in Summer for the rivers.There were opposite variations in the species diversity both rotifers and crustaceans underlying the transparency gradient of the drinking water sources.