Table 5: Results of logistic regression with forward selection for the occurrence of brown trout, brook trout, and bullhead in relation to environmental factors in 1994. Separate analyses were performed for 0+ and 1+ trout.

Variable S.E.Wald Nagelkerke

Brown trout 0+0.117
Depth CV7.4022.9876.1410.013
Constant−3.4091.2707.2090.007
Brown trout 1+0.267
Velocity CV6.6931.92512.0890.001
Constant−3.1961.1697.4810.006
Brook trout 0+0.599
pH−5.7451.40016.845<0.001
Constant36.1959.09515.836<0.001
Brook trout 1+0.461
pH−4.4311.10416.101<0.001
Constant28.3777.31515.048<0.001
Bullhead0.441
pH3.0551.0408.6360.011
Canopy cover−0.0820.0326.5570.003
Constant16.4246.4226.5410.010