Effect of time since deglaciation (tsd) on vascular plant presence (a) and vascular plant cover (b) at inland glaciers modelled using Bayesian Inference. Effects on introduced and native species are represented in red and blue, respectively. Points are the mean effects of tsd on the logit scale. Intervals represent the Bayesian 95% credible intervals. The vertical dotted lines correspond to the null hypothesis (effect is zero).