Supplement 1. Relative abundances, functional traits, and environmental context of understory herbs along an altitudinal gradient in Arizona, USA.

File List Observed relative abundance.txt Species names codes and trait values.txt Environmental measurements.txt Description Observed relative abundance.txt contains a matrix of observed relative abundances (from visual cover estimates) of each of 79 understory species in each of 96 1 × 1 m2 quadrats along an altitudinal gradient in Arizona (USA). Full names for the species codes are in Species names codes and trait values.txt. Checksum values are: col#1 = 4656, col#2 = 1.207001, col#3 = 0.054945, and last col = 0.110042 Species names codes and trait values.txt contains a matrix of functional traits measured on each of the 79 species. Each value is a species mean. Column (trait) names are self-explanatory; more details of these traits can be found in the original publication. Checksum values are: col#3 (c3grass) = 88, col#4 (C4grass) = 87, col#5 (“perennial”) = 143, and last col = 3649.274 Environmental measurements.txt contains a matrix of environmental variables measured in each of the 96 quadrats. Column (environmental variable) names are self-explanatory; more details of these traits can be found in the original publication. Checksum values are: col#1 = 4856, col#2 = 1734.266662, col#3 = 173.544977, and last col = 39.892 There are no missing values in any of the data files.