Table 2. Percentage of deviance explained by distance to the motorway (2006 data). The best-fitting model was determined by comparing the AICc values of the simple linear regression, log-linear regression (distance to Highway 401 was log-transformed) 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 log-linear 50.4
Wood Frog log-linear 41.8
Western Chorus Frog piecewise 34.3
Spring Peeper piecewise 31.5
Leopard Frog log-linear 23.5
American Toad piecewise 25.5
Gray Treefrog log-linear 14.2
Green Frog log-linear 11.2