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. 2015 May 6;10(5):e0123237. doi: 10.1371/journal.pone.0123237

Fig 4. Biplot of snake diet from a phylogenetic ordination using canonical correspondence analysis (CCA).

Fig 4

Canonical axes represent linear combinations of diets to snake phylogeny. Snake diet items are weighted averages of each species’ score. The first canonical axis accounts for 40% and the second canonical axis accounts for 23% of the total variation. Diet items (rhombus) close to the graph centre (0,0) indicate either low association with any snake clade (circles) or a positive association with a specific combination of all snake clades. Diet items displayed in the periphery of the graph indicate either high association with a specific snake clade or an occasional association, particularly for that clade with low occurrence (Ter Braak and Smilauer, 2002).