Table 1

Pearson correlations between principal components and phenotypic traits

PC1 (eigen-value 2.04)

PC2 (eigen-value 1.55)

PC3 (eigen-value 1.45)

Facemask darkness

Frontal brush size

Body depth

Knee-click frequency

Horn length

Dewlap droop

Body greyness

0.816***

-0.044

0.148

0.514***

0.503***

0.162

0.017

-0.199

0.053

Facemask darkness

0.835***

0.146

-0.139

0.543***

0.127

-0.196

0.026

0.027

Frontal brush size

0.809***

0.109

0.140

0.140

-0.181

-0.175

0.145

Body depth

0.091

0.805***

0.260

-0.515***

-0.304*

0.183

Knee-click frequency

-0.070

-0.902***

0.042

-0.186

-0.012

Horn length

-0.075

-0.233

-0.792***

-0.387**

Dewlap droop

0.043

-0.028

0.833***

The analysis explained 72% of the variance in the variables. * P < 0.05, ** P < 0.01, *** P < 0.001.

Bro-Jørgensen and Dabelsteen BMC Biology 2008 6:47   doi:10.1186/1741-7007-6-47