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. 2021 Feb 26;127(7):943–955. doi: 10.1093/aob/mcab034

Fig. 4.

Fig. 4.

Principal component analysis graphics of tree traits. (A) Geographical approach. (B) Ecological approach based on ecological niche modelling analysis. (C) Ecological approach based on Mahalanobis and Euclidean distances to the climatic centroid. (D) Historical approach. The contribution of each trait is proportional to the length of its corresponding vector. RHC, height/canopy width ratio; RHD, height/trunk diameter ratio; ToH, total height; TrH, trunk height; GC, geographical centre; GP, geographic periphery; NC_ENM, niche centroid; NP_ENM, niche periphery; NC_ME, niche centroid; NP_ME, niche periphery; HC, historic centre; HP. historical periphery.