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Table 2 Summary statistics for PCAs presented in Figs. 2 and 3 for the Z. mollissimaZ. dixoni complex

From: Integrative taxonomy of the Plain-backed Thrush (Zoothera mollissima) complex (Aves, Turdidae) reveals cryptic species, including a new species

Component loadings Reduced external measurement set A, both sexes Reduced external measurement set B, both sexes Full external measurement set, males only
PC1 PC 2 PC1 PC 2 PC 1 PC 2
External measurements
 Culmen l from skull      −0.49 0.04
 Bill w from distal nares −0.03 0.10    −0.12 −0.06
 Bill d from distal nares      −0.17 0.05
 Culmen ridge w      0.03 0.06
 Bill hook l      −0.09 0.10
 Rictal bristle maximum l      −0.29 −0.09
 Wing l (flat and stretched) 5.45 0.28 3.70 4.00 2.64 4.09
 Wingtip l      0.55 1.82
 Tail l    7.81 1.89 8.75 1.52
 White on outer rectrix, maximum      3.30 5.55
 White on outer rectrix, minimum      2.42 2.99
 Tarsus l 0.87 1.74 1.33 0.01 1.28 0.40
 Hind claw l      −0.11 0.23
Eigenvalues 30.45 3.13 76.40 19.38 102.56 62.32
% total variance explained 90.22 9.28 77.83 19.74 51.78 31.45
Plumage scoring
 Lower mandible base color 0.99 −0.01     
 Crown color 1.36 0.77     
 Supraloral 1.24 0.28     
 Lores 1.81 0.09     
 Auriculars % pale 0.39 0.08     
 Submoustachial prominence 1.16 −0.12     
 Malar strength 1.41 0.03     
 Throat color 1.82 0.01     
 Throat markings −0.27 0.81     
 Central breast marking shape 0.7 −0.88     
 Central breast marking density 0.77 0.56     
 Flank marking shape 0.24 2.44     
 Flank marking density 0.65 0.33     
 Undertail–tail tip contrast 1.60 −0.86     
 Claws darkness 1.16 1.61     
 Folded wing pattern strength 1.05 −0.47     
 Secondary covert edge width 1.49 1.86     
 Secondary covert edge color 0.74 0.42     
 Upperparts color 1.74 −0.41     
Eigenvalues 26.37 15.89     
% of total variance explained 36.29 21.87     
  1. Loadings deemed especially important in bold italic, those of intermediate importance in italics only
  2. l length, w width, d depth