Biology Reference
In-Depth Information
Chapter 5
T
HE
A
PPLICATION OF
E
QUATION
M
ODELS TO
D
ETERMINE THE
A
GE OF
P
INK
R
IVER
D
OLPHIN
S
KULLS
Luisa Fernanda Castellanos-Mora
1,2
;
Fernando Trujillo
2
and Manuel Ruiz-García
1
1
Laboratorio de Genética de Poblaciones Molecular-Biología Evolutiva. Unidad de
Genética. Departamento de Biología. Facultad de Ciencias. Pontificia Universidad
Javeriana. Bogotá DC. Colombia.
2
Fundación Omacha, Bogotá DC. Colombia.
A
BSTRACT
In this chapter, we show that several biometric skull measurements in the pink river
dolphin (
Inia geoffrensis
) are highly related to skull age, determined by teeth analysis.
Out of 50 morphometric skull measurements, the maximum width between the zygomatic
processes of the squamosal bones (V15) and the maximum width of the internal nares
(V21) were highly correlated with age. Regression analyses such as linear and 24 other
simple models, linear multiple regression, polynomial models, and distance multiple
regression (Gower, Absolute value, Mahalanobis and Minkowski) had similar results. On
average, these multiple regression equations demonstrated that the age of a dead pink
river dolphin is determined by only four cranial measures which explained 64-65% of age
variation.
Keywords
: Inia
, ages by teeth analysis, craniometric analyses, regression models.
mruiz@javeriana.edu.co , mruizgar@yahoo.es
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