南京市5座中型水库浮游动物群落结构及其与环境因子的关系

Community structures of zooplankton and its relation to environmental factors in five medium reservoirs in Nanjing City

于2010年5月—2011年2月,对南京市5座中型湖泊型水库浮游动物群落结构进行每季度一次的调查采样,同时测定总氮、总磷、透明度等理化因子及浮游植物等生物因子.共鉴定到浮游动物17科28属,优势种为盔形溞(Daphnia galeata)、象鼻溞(Bosmina spp.)、汤匙华哲水蚤(Sinocalanus dorrii)、多肢轮虫(Trichocerca spp.)、异尾轮虫(Polyarthra spp.)等.5座水库浮游动物年均密度变化范围为72~1401 ind./L,其中河王水库密度显著大于其他水库,而4个季节间浮游动物密度无显著差异.5座水库浮游动物年均生物量变化范围为102~339μg/L,季节间、水库间浮游动物生物量均无显著性差异.浮游动物群落结构与环境因子的典范对应分析表明,影响5座水库浮游动物群落结构的环境因子主要为营养盐、水温、透明度和浮游植物密度.

We quarterly investigated zooplankton community in five medium-lake shaped reservoirs in Nanjing during 2010- 2011 and analyzed their relations to environmental factors. Totally 28 genera of zooplankton belonging to 17 families were recorded. The dominant species were Daphnia galeata, Bosmina spp., Sinocalanus dorrii, Trichocerca spp. and Polyarthra spp.. The annual average abundance of zooplankton in five reservoirs ranged from 72 ind./L to 1401 ind./L. Zooplankton abundance was significantly higher in Hewang Reservoir than in other reservoirs while there was no significant difference among four seasons. The annual average biomass of the zooplankton in five reservoirs ranged from 102 μg/L to 339 μg/L and there was no significant differences in both five reservoirs and in four seasons. The structures of zooplankton community were analyzed in relation to environmental parameters by canonical correspondence analysis. The results showed that the nutrient level, water temperature, water transparency and phytoplankton abundance strongly regulated the zooplankton communities in five reservoirs in Nanjing Ctiy.