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Table 3 Summary results for principal components analysis of external measurements of Gyps indicus and G. tenuirostris.

From: Systematics within Gyps vultures: a clade at risk

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

  1. 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.