Table 1. Parameters from linear regression analyses relating climatic distance from optimal growing temperature to mean annual temperature (MAT) at seed source origin for black spruce and jack pine.

Species	Intercept		Slope		P	R2	N	Optimum MATa
	Value	S.E.	Value	S.E.				Mean	S.E.
Black spruce	3.27	0.17	−0.90	0.05	<0.0001	0.92	39	3.56	0.10
Jack pine	4.32	0.15	−0.82	0.04	<0.0001	0.98	55	4.93	0.07

^aMean and standard error of the population-specific optimum MAT values for each species.