étude ostéo-morphométrique des tortues marines de ... - Seaturtle.org

RESULTS
• The three different patterns in coracoid
Figure 4. Projection of all the superimposed coracoid coordinates on first and
second components axes using PCA.
The two first components of PCA (figure 4) account for a large part (89.3 %) of total shape
variance: They clearly separate three distinct groups: Group I contains Cm and Ca, group II
Cc and Ei, and group III Lk. Group I is widely separated from the other two, whereas groups
II and III appear closer.
As each turtle’s bone is defined by its coordinates, to compute a linear discriminant analysis,
we chose to use the PCA consensus. It allows reducing the dimension of data without deleting
landmarks coordinates.
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