Fig. 3: H. fraxineus European and Japanese sample sites and population genetic diversity.
From: The ash dieback invasion of Europe was founded by two genetically divergent individuals
a,b, European (a) and Japanese (b) sampling locations (to scale). c, A neighbour-net network of the concatenated coding regions of all genes in the genome (16.6 Mbp) for all European (n = 43) and Japanese haplotypes (n = 15). d, Boxplot of nucleotide diversity (π per 100 kbp) for 642 windows in Japanese (Jp) and European (Eu) populations. Nucleotide diversity is significantly greater in Japan than in Europe (Wilcoxon (π), Jp genome > Eu genome: W(1257) = 393,210, n = 1,258, ***P < 0.001). e, Boxplot of Tajima’s D (D per 100 kbp) for 642 windows across the genome and for each polymorphic gene within Japanese (n = 10,869) and European (n = 6,559) populations. In Japan, a signal of neutrality is present across the genome and tends to be negative in genes (purifying selection). The European population has a much broader positive distribution, consistent with a recent population decline. Boxplots show the median, upper and lower quartiles with outliers plotted outside whiskers which extend 1.5 times beyond the interquartile range.
