中国淡水原生动物多样性及其所受威胁

概述了地球上原生动物多样性现状，指出它在生物学界中的地位及其对人类的作用。从生态学概念出发，把淡水原生动物作为一个集合类群，对其多样性和所受威胁进行了讨论。以武汉东湖为例，讨论了半个世纪来由于人类活动的影响引起湖泊富营养化后，原生动物丰度增长了10倍，优势种出现替代现象，并有明显的小型化倾向。以长江三峡地区为例，分析了工业污染能损伤70％原生动物种类。原生动物多样性指数变化表明：在有机污染影响下作为饮用水的汉江其水质已达临界边缘。对待开发的西南武陵山地区生物资源考察中，用原生动物多样性现状阐明该地区水生态系的稳定性。

The diversity status of freshwater protozoans and the pollution stress on protozoa in China

The present paper introduced a broad outline of the diversity of protozoa on the globe , the position in the biology and the relation to the human being. Considering that the protozoa in freshwater as an aggregate group ecologically , its diversity and stress could be discussed. The stress resulting from anthropogenic sources in an eutrophication lake —Donghu Lake in a period of half a century resulted in a ten2fold increase of protozoan density and a succession of dominant species. The industrial pollution from the bank of the Three2Gorges Area of the Yangtze River damaged at least 70 % species of protozoans. In the largest tributary of the Yangtze River , the Hanjiang River , a resource of drinking water , the protozoan diversity index indicated that water quality was in a critical status. In the unexploited Wuling Mountains Area in southwestern China , the protozoan diversity demonstrated that the aquatic ecosystem in this area was healthy and stable.