上海崇明岛明珠湖轮虫群落结构

根据2008年1—12月上海市崇明岛明珠湖的综合调查资料，分析了明珠湖轮虫的数量分布、群落特征、种类组成、优势种及物种多样性.结果表明：本次调查共鉴定出轮虫27种，隶属于8科11属，优势种包括刺簇多肢轮虫、暗小异尾轮虫、萼花臂尾轮虫、未定名的旋轮属1种和剪形臂尾轮虫；轮虫生物密度的年均值为（1505.42±1304.63） ind·L^-1，生物量年均值为（2.012±2.146） mg·L^-1；明珠湖轮虫的Shannon-Wiener多样性指数、丰富度指数和均匀度指数均较低，优势种的优势度指数较大，反映出明珠湖轮虫群落结构不稳定；其富营养种数/贫营养种数（E/O）的比值为1.61±1.46，臂尾轮虫属（B）种数和异尾轮虫属（T）种数的比值（Q_B/T）为1.23±0.84.影响明珠湖轮虫生态特征分布的主要因子是水温；目前明珠湖水质呈轻度富营养化.

Community structure of rotifer in Mingzhu Lake of Chongming Island, Shanghai

A comprehensive survey on the quantitative distribution, community structure, species composition, dominant species, and species diversity of rotifer was conducted in the Mingzhu Lake of Chongming Island, Shanghai in January -December, 2008. There were 27 species of rotifer in the Lake, belonging to 8 families and 11 genera. The dominant species were Polyarthra trigla, Trichocerca pusilla, Brachionus calyciflorus, Brachionus forficula, and Philodina sp. The rotifer had an average annual density of ( 1505.42 ± 1304. 63 ) ind · L~(-1) , and an average annual biomass of (2. 012 ±2. 146) mg · L~(-1). The Shannon-Wiener diversity index, evenness index, and richness index of rotifer community in the Lake were relatively low, while the dominance index was rather high, indicating that the community structure of the rotifer was unstable. The E/O value wes 1.61±1.46 on average, and the Q_(B/T) values wes 1.23 ± 0. 84 on average. Water temperature was the main factor affecting the rotifer distribution. Biological assessment of water quality suggested that the Mingzhu Lake was on eutrophication.