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Macroinvertebrates as a biological indicator of aquatic health condition plays an important role in the protection and man⁃ agement of water ecological environment. Macroinvertebrates and water quality were investigated on the basis of samples collected at 33 sampling sites in the North Canal River Basin in May 2015. The community structure of macroinvertebrates was analyzed. The comprehensive water quality identification index and Biotic Index of macroinvertebrates were used to assess the water quality in the North Canal River Basin. The results obtained by using these two methods were compared each other by using the Kolmogorov⁃ Smirnov test and Pearson correlation analysis. In this study, a total of 23 species of macroinvertebrates belonging to 3 phylum, 4 class, 6 order, 11 family and 11 genera were identified in the North Canal River Basin, which mainly represented by aquatic in⁃ sects and molluscs. The community structure of macroinvertebrates in the whole basin was simple. The result of Biotic Index showed that 72% of the sampling sites were moderately(IV) or seriously(V) polluted and comprehensive water quality identification index showed that more than 57% of the sampling sites were worse than Class IV. The K⁃S test showed that the results were confirmed to normal distribution and Pearson correlation analysis exhibited that the results of these two methods had a significant positive correla⁃ tion. The two results had the same tendency generally. Depending on the results, the water quality in the North Canal River Basin

Macroinvertebrates community structure and water quality assessment in the North Canal River Basin, Beijing, China