Table S1 List of black spruce populations and their geographical and local climatic parameters.

Table S2 Genotypic data of each individual for candidate and control gene SNPs.

Table S3 Sequences and gene nomenclature of the adaptive gene SNPs identified.

Table S4 List of temperature-related gene SNPs detected in the eastern lineage of black spruce and their χ² values for heterogeneity of allele frequencies between north-eastern populations and Alaskan-Yukon populations of similar temperature conditions.

Figure S1 Distribution of allelic richness (R) for black spruce populations previously sampled by Gérardi et  al. (2010), based on five cpDNA SSR loci. Lineages were delineated according to nuclear DNA data.

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