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Fig. 5

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Effects of environmental factors on antioxidant enzyme activities in E. danicae. (A) Effect of changes in NO3 during the investigation period on GPx activity at the investigated localities on the Skrapež River. The solid line represents the linear fit of the data (R = 0.868, P < 0.001). (B) Effect of changes in DO during the investigation period on SOD activity at the investigated localities on the Skrapež River. The solid line represents the linear fit of the data (R = −0.678, P = 0.004). (C) Effect of changes in Nt during the investigation period on SOD activity at the investigated localities on the Skrapež River. The solid line represents the linear fit of the data (R = 0.771, F = 20.5, P < 0.001).