PCoA results showing Pinus pinaster forest plots in relation to latitude and clusters (A) and associated species (B). The colours refer to: red - Cluster 1 (Eastern Liguria); green - Cluster 2 (Central-Southern Tuscany and marginally Western Liguria); light blue - Cluster 3 (Southern Tuscany); purple - Cluster 4 (Eastern and Western Liguria). Species showing a correlation coefficient >0.5 with the first two axes have been superimposed to the ordination diagram (B), and are shown with a (+).