Table 6: Results of logistic regression with forward selection for the occurrence of brown trout, brook trout, and bullhead in relation to environmental factors in 2004. Separate analyses were performed for 0+ and 1+ fish.

Variable S.E.Wald Nagelkerke

Brown trout 0+0.082
Macrophytes−0.0290.0144.2830.039
Constant0.5760.7200.6400.424
Brown trout 1+0.136
Particle size0.5560.2266.0430.014
Constant−0.7740.9260.6990.403
Brook trout 0+0.219
pH−1.8020.6767.1000.008
Velocity3.2601.5864.2230.040
Constant9.1934.5704.0470.044
Brook trout 1+0.189
pH−2.1370.7238.7330.003
Constant13.6884.8388.0060.005
Bullhead0.383
pH2.9941.0927.5130.006
Depth0.1360.0624.7720.029
Constant−21.7178.1277.1400.008