沂河轮虫多样性研究

Study on Rotifera Species Diversity in Yihe River

对沂河轮虫区系组成进行了研究,共鉴定轮虫12种,隶属2目、9属.沂河轮虫有明显的优势种,龟甲轮虫占的比例最大,占36.5%,其次是三肢轮虫和水轮虫,各占27.4%和24.3%,鞍甲轮虫为稀有种,仅占0.6%.轮虫多样性指数较低,为1.737,均匀性指数较高,为4.316,说明沂河轮虫物种较贫乏,种群结构不稳定.

The rotifera population structure in Yihe River has been investigated and the results revealed that 12 species, which belonged to 2 orders and 9 genuses, were found in Yihe River. Keratella, Filinia and Rotaria were dominant in all 12 rotiferia species and they counted for 36.5%, 27.4% and 24.3% of numbers of rotifera, respectively. The rotifera species diversity index of 1.737 was low, while the evenness index of 4.316 was high, which suggested that the rotifera species in Yihe river was few and the population structure was brittle.