Table S3. GDM deviance in tree or fern species turnover between sample sites
explained by floristic dissimilarity in the other taxon, i.e., ferns or trees, respectively
(Biotic), selected climatic and soil variables combined (Envt), and geographical
distances (GD). Total deviance explained by all variables in the model is given in the
uppermost row. Variation partitioning was applied to calculate deviance explained by
each set of variables independently of the others vs. their intersections (values in
subsequent rows). Figs 2 b and f provide a visual summary of these fractions, referred
to by the letters A-G in parentheses.
Trees
Ferns
43 plots
43 plots
Total (Biotic  Envt  GD)
80.7
59.1
Biotic alone (A)
6.4
9.7
Envt alone (B)
12.9
5.9
GD alone (C)
1.1
0.2
Biotic and Envt, excl. GD (D)
28.9
29.6
Envt  GD, excl. Biotic (E)
9.4
0.1
GD  Biotic, excl. Envt (F)
0.1
0.7
Biotic  Envt  GD (G)
13.5
7.8