为了解滴水湖水系轮虫群落状况及其与水质因子的关系,于2010年1-12月,每月1次对上海滴水湖水系轮虫群落和水质状况进行调查。引水河道和湖区分别设置6个和5个采样点。通过调查,共鉴定轮虫35种,隶属于7科19属。其中,针簇多肢轮虫(Polyarthra trigla)、暗小异尾轮虫(Trichocerca pusilla)和裂痕龟纹轮虫(Anuraeopsis fissa)为优势种。引水河道中轮虫年平均密度为821.31/L,生物量为600.97×10-3mg/L;湖区中轮虫年平均密度为434.98/L,生物量为317.74×10-3mg/L。引水河道和湖区中Margalef多样性指数年均值分别为1.87±0.19和1.14±0.23,Shannon-Wiener多样性指数年均值分别为1.58±0.25和1.21±0.76。引水河道中轮虫密度、生物量及多样性指数均较湖区中高。季节变化上,引水河道中轮虫密度、生物量分别与BOD5呈显著和极显著正相关;湖区轮虫密度、生物量分别与水温呈显著和极显著正相关。水平分布上,轮虫生物量与总溶解盐和pH值均呈显著负相关,与NO2-N呈显著正相关,与BOD5则呈极显著正相关。根据污染指示种、物种多样性指数,并结合水体理化性质对滴水湖水系水质进行初步评价,结果表明,2010年滴水湖湖区为轻富营养,引水河道总体处于轻富营养-中富营养水平。
In order to understand the status of rotifer community and the relationship with water quality, the rotifer community and water quality status in Dishui Lake river system of Shanghai were monthly studied from January to December in 2010. There were six and five sampling points in the priming river course and the lake area, respectively. 35 species of rotifers belonging to 7 families and 19 genera were identified. The dominant species were Polyarthra trigla, Trichocerca pusilla, and Anuraeopsis fissa. The uniform annual values of rotifer density and biomass in the priming river course were 821.31/L and 600.97×10-3mg/L, respectively; and the same values in the lake area were 434.98/L and 317.74×10-3mg/L, respectively. Annual means of Margalef diversity index in the priming river course and the lake area were 1.87±0.19 and 1.14±0.23, respectively. Annual means of Shannon-Wiener diversity index in the priming river course and the lake area were 1.58±0.25 and 1.21±0.76, respectively. Density, biomass, and diversity index of rotifers in the priming river course were higher than that in the lake area. Seasonally, rotifer density was significantly positively correlated with the value BOD5 and a most significantly positive correlation between rotifer biomass and BOD5 was also detected in the priming river course. There was a significantly positive correlation between the rotifer density and water temperature in the lake area and the correlation between the biomass and water temperature was most significantly positive. Horizontally, the annual mean of rotifer biomass was significantly negatively correlated with the total dissolved salt and pH, while it was significantly positively correlated with NO2-N, and also had a most significantly positive correlation with BOD5. Water quality of Dishui Lake river system was evaluated considering indicator organisms, species diversity index, and physicochemical factors of the water. The results show that lake area is in the light eutrophication level and priming river course is in the light-middle eutrophication level in the year of 2010.
