Fig. 2 (a) Relatedness is a poor predictor of
negative plant–soil feedbacks. Metaregression
of 329 experimental plant–soil
feedback effects against phylogenetic
distance between interacting species pairs
(total species = 133). There was also no
relationship between relatedness and plantsoil
feedbacks for closely related species
interacting within two major families in our
data set, (b) Poaceae and (c) Asteraceae.
Unlike the estimates shown in the text, the
plotted regression slope and 95% intervals
assume a fixed model with no hierarchical
dependence.