Fig. 1. Normality test and frequency analysis for the individual abundance of Baetis fuscatus; Note octaves mean
Fig. 2. Normality test and frequency analysis for the individual abundance of Dugesia japonica.
Fig. 3. Result of TWINSPAN based on adjustment individual abundance of benthic macroinvertebrates (*: Division level, **: Eigenvalue of division level).
Fig. 4. Distribution patterns of physical factors according to each TWINSPAN group (a) stream order, (b) catchment area, (c) stream width, (d) altitude, (e) slope, (f) depth, (g) current velocity, (h) fraction of fine particles in substrates.
Fig. 5. Distribution patterns of chemical factors according to each TWINSPAN group (a) water temperature, (b) dissolved oxygen, (c) turbidity, (d) BOD5, (e) T-N, (f) T-P.
Fig. 6. Normality test for the environmental factors and factors following normality (a) stream order, (b) slope, (c) current velocity, (d) fraction of fine particles in substrates, (e) water temperature, (f) dissolved oxygen.
Fig. 7. Normality test for the environmental factors and physical factors not following normality (a) catchment area, (b) stream width, (c) altitude, (d) depth.
Fig. 8. Normality test for the environmental factors and chemical factors not following normality (a) turbidity, (b) BOD5, (c) T-N, (d) T-P.
Fig. 9. Distribution patterns of 6 groups of benthic macroinvertebrates based on canonical discriminant function 1 and 2.
Table 1. Summary of environmental factors in the sampling sites
Table 2. Environmental factors used in discriminant analysis
Table 3. Eigenvalues, Wilks' Lambda and significance of each discriminant function
Table 4. Five canonical discriminant functions using six discriminant variables
Table 5. Classification of results based on discriminant analysis
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