4 DISCUSSION
The model’s performance in interpreting the AUC values (Šimundić, 2009)
should be considered as good for S. gigantea and very good forS. canadensis , despite the relatively limited number of
explanatory variables retained after the model’s simplification.
Moreover, in the case of species with broad environmental tolerance,
such as the studied Solidago , the model’s performance is usually
lower than it is in comparing with specialist species, both plants and
animals (Guisan et al., 2007; Regos, Gagne, Alcaraz-Segura, Honrado, &
Domínguez, 2019). The model’s performance is improved by variables that
can be interpreted as proxies of P, A, B factors (see discussion below);
however, the importance of the variables differed considerably between
particular P, A, and B factors, as well as species studied.