Table 2 Average (∆CS_av) and net changes in fish compositional similarity (∆CS %), maximum taxonomic homogenization or differentiation (Max TH/TD), and percentage of watersheds with no variation in compositional similarity (∆CS = 0) between watersheds within biotic units (U1-U6). Significant probabilities (p < 0.05) supporting evidence for ∆CS (ANOSIM) and TH versus TD are in italics

U1

−13

32.1

66.0

14.3/−23.3

2

0.245

<0.001

TD: 0.010

U2

−18

26.3

71.4

12.4/−25.0

2

0.343

<0.001

TD: 0.030

U3

−6

22.4

73.9

23.0/−31.5

4

0.527

<0.001

TD: 0.090

U4

−7

16.1

83.0

14.0/−31.7

1

0.176

0.176

TD: 0.001

U5

−1.5

40.4

57.0

37.3/−40.7

3

0.380

<0.001

TD: 0.150

U6

−0.6

42.9

49.9

27.3/−39.5

7

0.228

0.001

TD: 0.080