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.