Count regression models explaining species richness (an averaged model based on three plausible models) of red-listed epiphytic lichens on 52 ancient oaks.

*The parameter estimates and confidence limits of the models are back-transformed: estimated values express the proportional change in species abundance per unit increase in the explanatory variable. For example. 1.05 and 0.95 express 5% increase and 5% decrease, respectively, in species abundance per unit increase in the explanatory variable.