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Fig. 2 | Annals of Forest Science

Fig. 2

From: Intraspecific variation of Quercus ilex L. seed morphophysiological traits in Tunisia reveals a trade-off between seed germination and shoot emergence rates along a thermal gradient

Fig. 2

Multivariate analysis of the climatic characteristics of the 15 Quercus ilex sampling sites. a Principal Component Analysis (PCA) correlations (factor loadings) of climatic variables with the first two principal components (PC). Longitude, latitude and elevation, in grey, were treated as supplementary variables. b PC1–PC2 score plot of the 15 populations studied. Each population sampled was characterized by its factorial score co-ordinates on the first two PCs. c Hierarchical Ascendant Classification (HCA) of holm oak sites according to their climatic variables. HCA analysis revealed 4 differentiated clusters, which colour code have been reported on the upper PC1-PC2 score plot

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Annals of Forest Science

ISSN: 1297-966X