Table 1.

List of variables used in the model

Sn	Variables	Descriptions
1	Species richness	Number of threatened species found in each elevational band
2	Null model	Species richness predicted for each elevational band from the mid-domain effect null model
3	Elevation	Elevation band along an altitudinal gradient (100–4900 m asl)
4	Range size	The difference between lower and upper distributional limits of a species in an altitudinal gradient
5	Population density	Human population density estimated for each elevational band