Potential influence of wildfire in modulating climate-induced forest redistribution in a central Rocky Mountain landscape

Ecological Processes

Table 1 Climate predictor variables used to develop species climate niche models, using non-parametric multiplicative regression

Acronym	Definition
MAP^a	Mean annual precipitation (mm)—log transformed
GSP	Mean growing season precipitation (mm; April–September)—log transformed
MTCM	Mean temperature (C°) in the coldest month
MTWM	Mean temperature (C°) in the warmest month
MMINDD0^a	Mean degree-days <0 °C
DD5	Mean degree-days >5 °C
PRATIO	Precipitation ratio (GSP/MAP)
SDI^a	Summer dryness index—(√DD5_Apr-Sept)/GSP
ADI	Annual dryness index—(√DD5)/MAP

^aUsed also to delineate ecoregions in LANDIS-II model (see Additional file 1: Appendix 1).
See (Rehfeldt 2006) for methods used to develop these climate data. Climate variables are further described and data are available at http://charcoal.cnre.vt.edu/climate/