Figure 4From: Strong reproductive barriers in a narrow hybrid zone of West-Mediterranean green toads (Bufo viridissubgroup) with Plio-Pleistocene divergencePrincipal component analysis based on pairwise F ST over all populations. Both axes are significant (P < 0.001). Samples are encoded as in Table 1. Colored ellipsoids correspond to clusters shown in Figure 1b and were only drawn for better visualization.Back to article page