湖北四湖泊营养类型与轮虫群落的关系

Relationship between the Trophication Classification and the Community Structure of Rotifers in Four Lakes

对湖北梁子湖水系不同营养类型 (中营养型、富营养型 ) 4个湖泊中轮虫的群落结构和物种多样性进行了周年研究 ,分析比较了不同营养类型湖泊的轮虫种类组成、分布、优势种组成、密度、生物量和多样性指数。结果表明 :轮虫的种类数、物种多样性与营养水平呈负相关关系 ,轮虫密度大体上随营养水平提高而增大 ,富营养化引起轮虫空间异质性降低 ,受污染湖泊与非污染湖泊轮虫种类数、寡污性种类数及分布差异尤为明显。用多样性指数评价湖泊营养状态与TLIc方法一致。

The community structure and biodiversity of rotifers were studied and compared over a period of one year in four lakes with different trophic state (mesotrophic and eutrophic). After analyzed the species composition, dominant species, abundance, biomass and diversity index of rotifers, it is found that the higher trophic status of lake, the smaller the number of species and biodiversity (measured as Margalef index, Shannon-Wiener index, K-dominant curves), and that rotifer density increased with the improvement of lake eutrophication. There were significant differences in number of oligosaprobity and rotifer species and their distribution between non-pollutted and pollutted lakes. There was a negative correlation among trophic status index, Margalef index and Shannon-Wiener index. The evaluation from comprehensive trophic level index is consistent with the results from biodiversity index.