Figure 2

Genome-wide distribution of genetic variation and differentiation across all the ten Baltic Sea three-spined stickleback populations. Chromosomes are labeled in black Roman numerals and represented as grey blocks in a circle. The fixation index F _ST (red line), nucleotide diversity π (green line), population mutation rate θ _W (blue line) and Tajima’s D (black and orange histogram) are plotted as functions of genomic position with a non-overlapping 100-kb sliding window. The top 2% F _ST, high π, and high θ _W and bottom 2% π and low θ _W are highlighted in black. Black and orange histograms represent Tajima’s D with negative and positive values, respectively. The red dots represented genomic regions with outlier loci.