Fig. 6.

Relationships between root traits described using principal component analysis. Arrow colours represent different types of traits (grey, morphological and architectural; dark blue, anatomical; dark red, mechanical). Each point corresponds to the assembly of averaged traits for each root topological order, which is given inside the point circle. Colours of symbols represent different species: red, Pometia tomentosa; green, Barringtonia fusicarpa; orange, Baccaurea ramiflora; blue, Pittosporopsis kerrii. Data from the same species were grouped using convex hull polygons.