Fig. 2 Pairwise compositional dissimilarity among plant
communities (turnover component, βturnover, based on
Simpson index) along the 3200-km environmental gradient. These results
were generated from the generalized dissimilarity model (GDM, for
details see methods) based on presence/absence data. (a) Relationship
between βturnover and environmental dissimilarity based
on all the environmental variables (MAP, MAT, altitude, soil N, and soil
P). (b) Relative importance of variables for explaining variation in
βturnover. (c-h) Partial ecological distances (i.e.
effects on βturnover) showing the individual effects of
each variable on βturnover for species with large (blue)
and small (yellow) genomes. The separation of plants into groups by
genome size was based on the global median genome size value of
terrestrial plants (2.5 pg/1C value) in the Kew database (seeMaterials and Methods ).
Results for separation into groups based on the median value of our
studied species (1.59 pg/1C value) are supplied in Fig. S3 .
Locations on each line associated with larger values on the y-axis
indicate an increased likelihood of observing that genome-size group at
that value along the x-axis, and higher maxima in curves indicate larger
effects associated with that variable overall.