Fine-scale population structure of A. thaliana in the Iberian Peninsula and Morocco. On each map, a branch of the inferred PST from Figure 2 is visualized. Adjacent to each map is the PST colored in the same manner as in the map. A–E show subbranches of the primarily European branch (blue branch in Fig. 2A), and F and G show subbranches of the primarily non-European branch (orange branch in Fig. 2A). (A) Branch corresponding to most of the Iberian population (Iberian Peninsula branch in Fig. 2B). (B) Branch corresponding to the western part of the Iberian Peninsula, with differentiation along a north–south gradient. (C) Branch corresponding to the northeastern part of the peninsula, with differentiation along an east–west gradient. (D) Branch corresponding to a small area in the center of the peninsula. (E) Branch corresponding to north Spain, with a differentiated subbranch along the northeast coast. (F) Branch not belonging to the primary European branch in Figure 2A, corresponding to the Iberian Peninsula and Morocco. Population structure extends on a north–south axis from Africa to Europe over the Strait of Gibraltar. (G) Branch corresponding to Morocco, showing fine-scale population structure in Morocco.
