Abstract
Some ecological methods of evaluation of water pollution, including biotic indicesand correspondence analysis, which is a kind of multivariate analysis, were comparedusing diatoms and benthic invertebrates as indicator organisms. Though diversityindices have been used for environmental evaluation in some previous works, the present work showed their relatively poor ability of indicating water pollution. The biotic indices or the sample scores of correspondence analysis showed intermediatecorrelation (0.35<r<0.75) with chemical oxygen demand (COD) or electric conductivety (EC). When both COD and EC were taken into a multiple regression model, large multiple correlation coefficients were observed (0.71<R<0.91). As for benthicinvertebrates, the effect of river bed materials was also detectable.
