highly significantP value < 2.2e-16
The Spearman’s rank correlation coefficient of nucleotide diversity by gene between species was positive and highly significant for both diversity measures ( π : ρ = 0.36, P value < 2.2e-16; θ W : ρ = 0.38, P value < 2.2e-16) for a subset of 6,798 genes with these statistics available in both species ( supplementary fig.