Fig. 43. Scores of sample means for the first principal component extracted from the variance– covariance matrix of arcsine squareroottransformed frequencies of marmoratus alleles at the seven highly polymorphic loci (IDDH, sMDHP, EST2, PEPB, PEPD, GPI, and TF) plotted against sample locality on all three transects of the hybrid zones, as in figure 42. Data are from tables 6, 8, and 10.