The present paper embodies two studies: faunal analysis of aquatic oligochaeta in Zhongshan, South China, and environment gradient analyses of zoobenthos in 13 Yangtze shallow lakes.

• 本研究对广东中山淡水寡毛类进行了区系调查,对长江中下游13个阻隔湖泊和通江湖泊进行了底栖动物群落环境梯度分析,初步构建了环境指示函数。