Fig 7. Relationship between seasonal temperature difference and precipitation balance defined for each ponderosa pine variety.

Relationship between summer-winter mean temperature difference and summer-spring precipitation balance (ratio) derived from the ponderosa pine variety presence point locations (“x” symbols) and associated haplotype sampled locations (circles). A linear model and power model were fit to the 1961–1990 climate data associated with the P. p. var. ponderosa and var. scopulorum locations, respectively, to demonstrate the relative strength of these contrasting climate relationships. Three outlier locations were removed for var. scopulorum (Haplotype 2).