Supplement 1. Database of wood density for species naturally occurring in Central and in South America.

File List list-references.txt wood-density-file.txt Description The list-references.txt file contains the list of literature sources consulted to produce the wood-density-file.txt wood density dataset. All valid species names were checked against the Missouri Botanical Garden's website (06/2004). In file list-references.txt, c olumn names are as follows. (1) CODE - conventional code for the literature source (2) LOCMEAS - country of study (or region, if applicable) (3) NBSPP - number of valid species in the dataset (4) REFERENCE - literature source for the dataset (several sources if applicable) In file wood-density-file.txt, column names are as follows. (1) FAMILY - family name for the species (according to the revised Angiosperm Phylogeny Group's classification) (2) GENUS - genus name (3) SPECIES - species name (4) WSG - mean wood species gravity for the species (5) NB - total number of literature values for the species (6) to (68) -- one column per literature source. Column name corresponds to the CODE entry in file list-references.txt (69) MEANELEV - mean elevation of the voucher speciemen for the species (70) SDELEV - standard deviation of the mean elevation (71) to (79) -- presence-absence variables for the nine ecoregions as described in the main text (see Fig. 1)