INVESTIGADORES
GONZALEZ paula Natalia
artículos
Título:
Ontogenetic allometry and cranial shape diversification among human populations from South America
Autor/es:
GONZALEZ P.; PEREZ S. I.; BERNAL V.
Revista:
ANATOMICAL RECORD
Editorial:
WILEY-LISS, DIV JOHN WILEY & SONS INC
Referencias:
Lugar: New York; Año: 2011 vol. 294 p. 1864 - 1874
ISSN:
0003-276X
Resumen:
Modifications of ontogenetic allometries play an important role in
patterning the shape differentiation among populations. This study
evaluates the influence of size variation on craniofacial shape
disparity among human populations from South America and assesses
whether the morphological disparity observed at the interpopulation
level resulted from a variable extension of the same ontogenetic
allometry, or whether it arose as a result of divergences in the pattern
of size-related shape changes. The size and shape of 282 adult and
subadult crania were described by geometric morphometric-based
techniques. Multivariate regressions were used to evaluate the influence
of size on shape differentiation between and within populations, and
phylogenetic comparative methods were used to take into account the
shared evolutionary history among populations. The phylogenetic
generalized least-squares models showed that size accounts for a
significant amount of shape variation among populations for the vault
and face but not for the base, suggesting that the three modules did not
exhibit a uniform response to changes in overall growth. The common
slope test indicated that patterns of evolutionary and ontogenetic
allometry for the vault and face were similar and characterized by a
heightening of the face and a lengthening of the vault with increasing
size. The conservation of the same pattern of shape changes with size
suggests that differences in the extent of growth contributed to the
interpopulation cranial shape variation and that certain directions of
morphological change were favored by the trait covariation along
ontogeny.