滆湖轮虫群落结构与水质生态学评价

The Community Structure of Rotifer and Ecological Assessment of Water Quality of Lake Gehu

研究了浅水湖泊——滆湖的轮虫群落结构,并用轮虫污染指示种类、E/O值、QB/T值和生物多样性指数评价滆湖的水质和营养状况。在两周年的研究中,共发现轮虫69种,污染指示轮虫39种。优势种为萼花臂尾轮虫(Brachionus calyciflorus)、前节晶囊轮虫(Asplanchna priodonta)、针簇多肢轮虫(Polyarthra trigla)、长三肢轮虫(Filinialongiseta)和裂足臂尾轮虫(B.diversicornis)。轮虫密度年平均值为1584ind./L,生物量年平均值为5.9821mg/L。密度秋季最高,生物量夏季较高。轮虫物种多样性较低,多样性指数与其密度及生物量正相关。滆湖三个生态功能区轮虫的种类相似;湖区北部与中部的轮虫现存量差异不显著,与南部的差异显著,中部与南部间差异极显著。根据指示生物法、生物指数法和多样性指数法评价滆湖水质及营养类型,滆湖为富营养型。

The community structure of rotifer and ecological assessment of water quality, including E/O, QB/T index and the biodiversity index, were studied in Lake Gehu, Jiangsu Province. After two-year monitoring in situ, 69 species of rotifer were identified, 39 species were pollution indicator species.The dominant species were Brachionus calyciflorus, Asplanchna priodonta, Polyarthra trigla, Filinia longiseta and B. diversicornis. The average annual density was 1 584 ind ./L and the average annual biomass was 5.982 1 mg/L. The total density reached the maximum in autumn and biomass was highest in summer. The species biodiversity was positively related to the density and biomass. Rotifer species were similar in three zones of lake Gehu. There were no significant differences between the north area and the middle area, but there were significant differences between the north and the south area. Biological assessment of water pollution and trophic condition were evaluated by species indicators, biotic index of E/O, QB/T and species biodiversity index. The trophic type of Lake C, ehu could be regarded as eutrophic.