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Table 3 Loading of the first two axes of a principal component (PC) analysis on 22 adult morphological variables

From: Genetic and morphological divergence among three closely related Phrynocephalus species (Agamidae)

  Females Males
PC1 PC2 PC1 PC2
Snout-vent length 0.305 − 0.245 0.485 − 0.249
Head length 0.606 0.451 0.504 0.479
Head width 0.122 0.664 0.208 0.601
Abdomen length −0.274 0.120 −0.145 0.070
Tail length 0.371 0.670 0.199 0.684
Fore-limb length 0.341 0.780 0.215 0.802
Hind-limb length 0.623 0.593 0.478 0.669
4th finger length 0.588 0.578 0.373 0.754
4th toe length 0.759 0.397 0.618 0.529
Claw length of the 4th finger 0.471 −0.380 0.338 −0.303
Claw length of the 4th toe 0.371 −0.354 0.306 −0.329
Nasal scales 0.661 0.012 0.636 0.038
Internasal scales 0.619 −0.001 0.599 0.071
Scales around parietal eye 0.593 −0.079 0.580 −0.130
Supraocular scales 0.630 −0.300 0.733 −0.286
Superciliaris 0.339 −0.235 0.425 −0.336
Gular folds 0.393 −0.005 0.355 0.052
Dorsal scales 0.797 −0.350 0.843 −0.238
Ventral scales 0.805 −0.391 0.816 −0.338
Subdigital lamellae of the 4th finger 0.760 −0.110 0.800 −0.021
Subdigital lamellae of the 4th toe 0.829 −0.244 0.836 −0.128
Scales around midbody 0.646 −0.424 0.673 −0.483
Variance explained (%) 33.1 16.2 30.5 17.7
Factor scores on PC1 F2, 235 = 164.34, P < 0.001 PGa, PPb, PVc F2, 235 = 215.60, P < 0.001 PGa, NPPc, SPPb, PVc
Factor scores on PC2 F2, 235 = 5.86, P < 0.01 PGb, PPab, PVa F2, 235 = 2.38, P = 0.095
  1. Size effects are removed in all cases by using residuals from regressions on SVL. Variables with the main contribution to each factor are in bold. Species with different superscripts differ significantly (Tukey’s test, α = 0.05; a > b > c). See Fig. 1 for definitions for PG, PP and PV