FIGURE 3 Ordination plot of the principal component analysis
(PCA) of sampling sites based on habitat conditions between impoundments
and free-flowing segments. Black and hollow circle represent
impoundments and free-flowing segments, respectively. WW , wetted
width; WD , water depth; WT , water temperature; SH ,
substrate heterogeneity; SC , substrate coarseness; DO ,
dissolved oxygen; CV , current velocity