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Table 4 Projection of the original morphological characters onto the first eight PCO axes

From: Qualitative skeletal correlates of wing shape in extant birds (Aves: Neoaves)

  PCO1 PCO2 PCO3 PCO4 PCO5 PCO6 PCO7 PCO8
drp −0.58 0.25 −0.16 0.98 0.29 −0.26 −1.54 −0.13
crp −0.41 1.05 0.17 −0.22 −0.42 −0.43 0.19 −0.15
dpf −0.78 −0.77 −0.52 −0.31 −0.11 0.31 0.16 −2.01
iip1 −0.43 0.03 0.12 −0.22 −0.83 0.96 −0.24 0.29
iip2 −0.68 0.08 −0.75 −0.39 0.65 0.01 0.15 0.35
fp −0.45 0.00 0.90 −0.45 0.73 −0.16 −1.46 −0.19
  1. This matrix was used to transform the loadings of PCO axes in the RDA ordination into a biplot of the original morphological variables (Figure 2a).
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