大夏河临夏段肉鞭虫群落结构特征及其与水质的相互关系

Community structure of Sarcomastigophora and its relationship with water quality in Linxia section of Daxia River

2005年2月—2007年3月对大夏河临夏段的肉鞭虫物种多样性和分布特征进行了研究。结果表明:大夏河临夏段的肉鞭虫共记录135种,隶属于5纲16目,其中优势类群为眼虫目(Euglenida)和变形目(Amoebida);大夏河临夏段同一水期不同采样点之间以及不同水期同一采样点之间群落相似性系数均较低,均表现出明显的空间异质性;肉鞭虫群落结构特征表明,大夏河临夏段水体已受到不同程度的污染,枯水期较丰水期污染严重。

The species diversity and distribution of Sarcomastigophora in Linxia section of Daxia River were studied from February 2005 to March 2007. A total of 135 species belonging to 16 orders of 5 classes were recorded, with the dominant of Euglenida and Amoebida. For different sampling sites in the same water period and for different water periods at the same sampling site, the Jaccard similarity index among Sarcomastigophora communities was all lower, suggesting an obvious spatial heterogeneity. Such a character of the community structure of Sarcomastigophora suggested that the water body of Linxia section of Daxia River had been polluted to some extent, and the pollution was heavier in low water period than in plentiful water period.