Fig. 4

PCA analysis performed on the six functional traits (averaged at the strain level) for the 40 T. thermophila strains. The left panels represent the distribution of the strains along dimensions 1 and 2 (A) and along dimensions 1 and 3 (C). The numbers in (A) and (C) stand for the labels of the strains. The right panels represent the associated correlation circles along the first and second dimensions (B) and the first and third dimensions (D). The arrows assess the representativity of the traits on the considered dimensions, with the closer the arrow is to the edge of the circle, the better the trait is represented. The functional traits are colored based on their measurement difficulty