Table 3

Summary results for principal components analysis of external measurements of Gyps indicus and G. tenuirostris.
Factor component loadings
Variable
 1
 2
 3
 4
 5
 6
Culmen l
 0.75
 -0.21
 0.22
 0.45
 0.00
 -0.20
Bill w
 -0.38
 0.56
 0.41
 0.35
 0.20
 -0.17
Maxilla d
 -0.17
 0.49
 0.28
 0.48
 0.28
 0.23
Nares l
 -0.80
 0.29
 0.06
 0.04
 0.34
 -0.01
Gape w
 -0.01
 0.30
 0.07
 0.66
 -0.01
 0.12
Bill l from gape
 0.79
 0.15
 -0.08
 0.34
 -0.20
 0.01
Mandibular symphysis l
 0.74
 0.33
 0.32
 0.11
 0.13
 0.10
Tail l
 0.01
 -0.07
 -0.69
 -0.47
 0.18
 0.25
Outer rectrix l
 -0.29
 -0.29
 0.80
 0.12
 -0.18
 0.20
Alula l
 0.72
 0.19
 0.06
 -0.17
 -0.04
 0.35
Tarsus l
 0.72
 0.25
 -0.12
 -0.24
 0.11
 0.22
Tarsus proximal b
 0.60
 -0.02
 0.57
 -0.03
 0.12
 -0.40
Tarsus minimum b
 0.33
 -0.12
 0.42
 -0.41
 0.01
 0.28
Tarsus distal b
 0.63
 -0.30
 0.09
 0.15
 -0.30
 -0.45
Pes digit I l
 0.64
 0.42
 -0.11
 -0.17
 0.28
 0.02
Pes digit I claw l
 -0.04
 -0.71
 0.01
 -0.09
 0.61
 0.09
Pes digit II l
 0.56
 0.41
 -0.11
 -0.38
 0.37
 -0.36
Pes digit II claw l
 0.15
 -0.47
 -0.24
 0.51
 0.21
 0.51
Pes digit III claw w
 -0.36
 -0.15
 0.02
 0.18
 0.62
 -0.32
Pes digit III claw d
 0.71
 -0.46
 0.20
 0.22
 -0.07
 -0.08
Pes digit IV l
 0.75
 0.28
 -0.26
 0.09
 0.11
 0.22
Pes digit IV claw l
 0.53
 -0.43
 -0.21
 0.09
 0.49
 -0.03
Summary statistics
Eigenvalues
 6.78
 2.76
 2.30
 2.17
 1.76
 1.43
Percent variance explained
 30.81
 12.53
 10.46
 9.87
 8.00
 6.48
P
 ***
 ns
 ns
 ns
 ns
 ns

Significance levels (ns, P > 0.05; ***, P ≤ 0.001) from two-sample t-test between component loadings for indicus and tenuirostris. Abbreviations for variables are as in Table 3.

Johnson et al. BMC Evolutionary Biology 2006 6:65   doi:10.1186/1471-2148-6-65