Fig. 3

Generalized additive models of the relationship between harvest year and a forest influence and b perimeter-to-area ratio in ARN coupes. Shaded areas indicate the 95% confidence interval. Perimeter-to-area ratio was log-transformed prior to modelling. d² is the proportion of the null deviance explained by the model. p values indicate the approximate significance of the single smooth term, while edf is the estimated degrees of freedom for the smooth term