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Table 2 Eigenvectors from principal component analysis (PCA) of habitat variables

From: Habitat selection by bluetongue lizards (Tiliqua, Scincidae) in tropical Australia: a study using GPS telemetry

PCA axis PC1 PC2 PC3 PC4
Character More trees Heavy canopy Open Shaded
Eigenvalue 3.37 1.44 1.09 0.77
% variation explained 42.08 17.97 13.63 9.59
Eigenvectors: NT study site     
Bare ground (%) -0.006 0.01 0.0001 0.003
Grass cover (%) 0.001 -0.02 -0.003 0.002
Leaf-litter cover (%) 0.006 0.002 0.001 -0.005
Leaf-litter depth (mm) 0.03 0.01 0.005 -0.03
Understory cover (%) 0.007 0.002 0.04 -0.01
Canopy cover (%) 0.01 0.006 -0.02 0.01
Number of trees 0.12 -0.10 -0.26 -0.12
Number of shrubs 0.03 -0.008 0.04 0.18
Eigenvalue 2.73 1.26 1.86 1.01
% variation explained 34.12 15.74 14.83 12.67
Eigenvectors: WA study site     
Bare ground (%) -0.003 0.03 0.003 0.02
Grass cover (%) -0.007 -0.007 -0.007 0.001
Leaf-litter cover (%) 0.007 -0.001 -0.004 -0.004
Leaf-litter depth (mm) -0.001 -0.002 0.04 -0.008
Understory cover (%) 0.005 0.01 -0.006 -0.02
Canopy cover (%) 0.009 0.002 -0.004 0.02
Number of trees 0.20 -0.22 0.08 0.21
Number of shrubs 0.04 -0.03 0.02 -0.02