Table 1. Description of factors included as predictor variables to model the effects of climate change on potential global distributions of the invasive P. clarkii.

Predictor Variable	Factor	Description
Climate	T max	Average (1950–2000) max temperature (°C) of warmest month for 2.5 arc-min map grid cell; data available at http://www.worldclim.org
	T min	Average (1950–2000) min temperature (°C) of coldest month for 2.5 arc-min map grid cell; data available at http://www.worldclim.org
	Prec dry	Average (1950–2000) precipitation (mm) of driest quarter for 2.5 arc-min map grid cell; data available at http://www.worldclim.org
	Prec wet	Average (1950–2000) precipitation (mm) of wettest quarter for 2.5 arc-min map grid cell; data available at http://www.worldclim.org
Future Climate	T max ,	Max temperature (°C) of the warmest month of the year 2050 provided by WorldClim for 2.5 arc-min map grid cell;
	T min	Min temperature (°C) of the coldest month of the year 2050 by WorldClim for 2.5 arc-min map grid cell;
	Prec dry	Precipitation (mm) of the driest quarter of the year 2050 provided by WorldClim for 2.5 arc-min map grid cell;
	Prec wet	Precipitation (mm) of the wettest quarter of the year 2050 provided by WorldClim for 2.5 arc-min map grid cell;
Topography	Altitude	Height (m) above sea level; data available at http://www.worldclim.org
Habitat	Land use	Land cover type: water habitat (1) or not (0) reclassified from the original land cover maps; available at http://bioval.jrc.ec.europa.eu/products/glc2000/glc2000.php
	NDVI	Average (1982–2000) normalized difference vegetation index for 12 months; available at http://edit.csic.es/Soil-Vegetation-LandCover.html
Human Impact	Human Footprint Index	Human footprint index value (0–100) map grid cell; (data available at http://www.ciesin.columbia.edu/wild_areas/)