Principal Component Analysis
The principal components were calculated after linkage pruning the SNPs - using window size 50, step size 10 and – pairwise r2 threshold of 0.1 -, both with PLINK 1.9 (Chang, Chow et al. 2015). Images were created with the R package tidyverse version 2.0.0 (Wickham, Averick et al. 2019).