2.3 Statistics to explore selective sweep regions
For the selective sweep analysis, different statistics includingF ST, θπ, and Tajima’s D were calculated to detect regions under selection. We calculated the genome-wide weightedF ST (Weir and Cockerham 1984), as it is a more precise measure of average genetic distance between groups with unequal samples (Spolaore and Wacziarg 2009). We then estimated nucleotide diversity θπ by using VCFtools (‐‐window‐pi 50,000 ‐‐window‐pi‐step 25,000) (Danecek et al. 2011). For the entire genome, sliding window analyses were performed with a window size of 50 kb and a step size of 25 kb. The average F ST and log2 (θπ SWA/θπ Northeastern Asia) values of SNPs in each window were calculated.