Table 2

Percentage of variance explained by successive shape axes for each module of the mandible
PC1 PC2 PC3 PC4
Mandibule 39.2 13.8 9.3 7.6
Alveolar 46.4 14.0 12.0 7.8
Ramus 45.6 14.1 10.0 9.5
IncisorZ 54.9 21.0 9.4 6.2
MolarZ 48.6 24.7 10.6 7.0
Coronoid 74.7 10.1 6.5 4.9
Condyle 54.5 16.7 10.8 4.5
Angular 43.3 23.3 16.5 6.8

The shape of each module was analyzed using a principal component analysis on the Cartesian coordinates of the landmarks and sliding landmarks after a Procrustes superimposition. Difference between parental groups is expected to be displayed on the first axis and transgression characterizing hybrids on the second axis. The percentage of variance explained by the successive axes allows evaluating the relative importance of the signal displayed on each axis.

Renaud et al.

Renaud et al. BMC Evolutionary Biology 2012 12:141   doi:10.1186/1471-2148-12-141

Open Data