Figure 1. Map indicating locations of the study populations in Fennoscandia (blue symbols) and Italy (red symbols), and of the two field common gardens (triangles), one in Sweden (Rödåsen) and one in Italy (Castelnuovo di Porto).
Figure 2. Climate at the site of origin of the natural populations of Arabidopsis thaliana sampled in Italy (in red) and Fennoscandia (in blue). (A) Mean monthly temperature (˚C), and (B) Mean monthly precipitation (mm). Data retrieved from the WorldClim database (Fick and Hijmans 2017).
Figure 3. Mean germination proportion (number of seeds germinating per viable seed sown) of natural populations of Arabidopsis thaliana sampled in Italy (in red) and Fennoscandia (in blue) (A) 12 weeks after seed harvest in three maternal environments: greenhouse, the Italian field site (Castelnuovo di Porto), and the Swedish field site (Rödåsen), and (B) 1, 3, 12, 30 and 54 weeks after seed maturation in the greenhouse. Regional means are indicated in bold.