Fig. S1. Linear regression relationship between the mean number of herb species per transect and the three factors included in the analysis. Graphs without trend lines lack significant relationships.

Fig. S2. Linear regression relationships between the mean values of beta diversity and the three factors included in the analysis. True beta diversity (following Tuomisto 2010) was calculated as: qDβ=qDγ/qDα.Graphs without trend lines lack significant relationships.

All beta / Fern beta / Monocotyledons beta / Dicotyledons beta
OLS / SAR / OLS / SAR / OLS / SAR / OLS / SAR
Annual Precipitation (mm) / 3462.80** / 3464.49** / -0.32* / -0.33*** / 0.22* / - / - / -0.63***
Precipiation of driest month (mm) / - / - / - / 0.26* / -0.55*** / -0.53** / - / -
PC1 / - / - / - / -0.22* / - / - / - / -
Continent / - / - / - / 0.38** / -0.05*** / -0.05** / - / 0.20***
R² / 0.12* / 0.13 / 0.18** / 0.28* / 0.15* / 0.18 / 0.21** / 0.43***
AIC / 290 / 292 / 337 / 334 / 374 / 374 / 451 / 440
Delta AIC / 3.63 / 2.62 / 0.82 / 1.96
Moran's I / -0.03 / 0 / -0.07 / -0.05 / -0.06 / 0.01 / -0.08 / -0.02
All transect / Fern transect / Monocotyledons transect / Dicotyledons transect
OLS / SAR / OLS / SAR / OLS / SAR / OLS / SAR
Annual Precipitation (mm) / -0.23* / - / - / 0.28** / -0.385*** / -0.26* / -0.47*** / -0.42***
Precipiation of driest month (mm) / 0.51** / - / 0.40*** / - / 0.51*** / 0.40** / - / -
PC1 / 0.60*** / 0.56*** / 0.76*** / 0.7*** / - / _ / 0.36*** / 0.37***
Continent / - / - / 0.28* / 0.32* / 0.61** / _ / -0.4* / -
R² / 0.4*** / 0.46* / 0.66*** / 0.71** / 0.3*** / 0.34* / 0.42*** / 0.43
AIC / 659 / 656 / 553 / 544 / 520 / 519 / 453 / 545
Delta AIC / 0 / 0.31 / 0.64 / 1.96
Moran's I / 0.09* / 0.02 / 0.16* / 0 / 0.1* / 0.1 / 0.04 / 0.01

Tab. S1 SAR and OLS results for Beta diversity and transects.