Fig. 2

A Representation of the occupied environmental niche with plots showing the relationships among the variables that more strongly correlated with the three first principal factors obtained from a PCA built on 19 climate variables retrieved from Worldclim and altitude (Table 1). a Precipitation of Driest Quarter vs. Minimum Temperature of Coldest Month; b Precipitation of Driest Quarter vs. Altitude; c Minimum Temperature of Coldest Month vs. Altitude. Points in grey represent the global environmental conditions, blue points represent the occurrence records for the native areas, and red (empty) circles represents the occurrence records for the invaded areas. Temperature is in  °C, precipitation is in mm, and altitude is in m