2.11 Selection signature analysis
Two complementary approaches based on the allele frequencies of variable
sites were used to identify regions potentially affected by long-term
selection. We calculated population fixation statistics (FST) and
nucleotide diversity (θπ) for each sliding window in 10-kb windows with
5-kb step size. We Z-transformed the distribution of FST and calculated
the log value of θπ ratios. Top 5% of log-odds ratios for both θπ and
FST were chosen as putative selection targets.
Results