Table 2. Percentage of deviance explained by distance to the motorway (2006 data). The bestfitting model was determined by comparing the AICc values of the simple linear regression, loglinear regression (distance to Highway 401 was logtransformed) and piecewise regression models (Table 3) for each species and for species richness.


Species 
Best fitting regression model 
Percent of deviance explained by distance to
motorway 

Species Richness 
loglinear 
50.4 
Wood Frog 
loglinear 
41.8 
Western Chorus Frog 
piecewise 
34.3 
Spring Peeper 
piecewise 
31.5 
Leopard Frog 
loglinear 
23.5 
American Toad 
piecewise 
25.5 
Gray Treefrog 
loglinear 
14.2 
Green Frog 
loglinear 
11.2 


