Fig. 3

Biplots of principal component analyses (only the two first components are shown) illustrating relationships between fire-related traits (SVR, surface to volume ratio) and fire recurrence modalities in the entire study area (a), the northern part (b), and the southern part (c) for P. halepensis. Populations sampled in the high fire recurrence modality (PHF) are circled in blue and populations sampled in the no fire modality (PHNF) are circled in orange. The correlation plots indicate the regression coefficient of each trait on each component; the darker and larger the circle color and size, the stronger the correlation