Appendix III. Multiple-regression models describing numerical density of over-20-cm trout (trout/km) 

 as a function of stream nabitat variables. 



1 . All 30 stations included (urban and controls) 



log trout/km = 15.289 + 1.77 log water velocity 



+ 0.153 log critical period flow/mean flow 



+ 0.317 log of solid overtiead cover 



- 0.3'»8 log max summer water temp 



+ 0.2't3 log vegetational substrate rating 



r = 0.8753, simple r^ - 0.763, adjusted r^* = 0.713 



Order 



or Adj. r F-values at step 



entry Variable at step log wtrvel log CPf/MF log cover log maxT log substi 



log wtrvel 

 log CPF/MF 

 log cover 

 log maxT 

 log substr. 



.5't2 



.670 

 .703 

 .713 



35.297 

 23.606 

 25.99't 

 30,856 

 25.552 



8.768 

 8.6'.7 

 If. 902 

 1.15't 



5.352 



6.12't 

 5.105 



3.8't5 

 5.902 



1.922 



2. Urban Stations Only 



log trout/km = - 64.255 - 0.762 log water velocity 



+ 0.905 log vegetational substrate rating 



+ 1.560 log NO -N 



+ 0.72't log annual streamflow variation 



+ 1.827 log max T 



+ l.O'i't log critical period flow/mean flow 



- 0.'«22 log % pool & turbulence cover 



+ 0.215 log % eroding bank 



r - 0.976, simple r 



Order 

 or 

 entry Variabl 



0.952, adjusted r 



Adj. r 



F-value at step 



at step log wtrvel log substr log NO log ASFV log maxT log CPF/MF log pool loger. bu- 



