Figure S1 Spatial distribution of Forest Inventory and Analysis plots.

Figure S2 Fifteen subregions of the study area divided according to terrestrial ecoregions.

Figure S3 Moran's I spatial autocorrelograms of the decomposed variation in different analyses.

Figure S4 Estimated variation in the local species relative abundance explained by different effects in different analyses.

Figure S5 Reduced trait space of a principal components analysis of the nine traits studied and the loading of all studied tree species in the reduced trait space.

Table S1 Species list and their abundances in different metacommunities for the tree species used in the analyses.

Table S2 Functional traits used in the analysis.

Table S3 Summary of the estimated variation explained by different effects in different analyses.

Appendix S1 Additional details on the methods used in this study, and additional references.

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