No modularity at ventral level in the horse skull

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Fecha de publicación
2021Cita recomendada
Parés Casanova, Pere-Miquel;
.
(2021)
.
No modularity at ventral level in the horse skull.
Anatomia, Histologia, Embryologia, 2021, vol. 50, núm. 5, p. 849-852.
https://doi.org/10.1111/ahe.12728.
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Morphological integration and modularity are concepts that refer to the covariation
level between the components of a structure. Morphological modules are independent subsets of highly correlated traits. The horse skull has been studied as a whole
functional structure for decades, but the integrative approach towards quantitative examination of modules is scarce. We report here the first evaluation of cranial
modularity in the horse at basal level. For this, we studied the modularity hypothesis
for splanchnocranium and basicranium modules in the horse, two phenotipic regions
under local influence by soft-tissue–hard-tissue interfaces. Using geometric morphometrics to capture the shape and location, we examined both modules in a sample
of 23 dry skulls belonging to Pyrenean Horse Breed using 57 two-dimensional cranial landmarks. Modules were compared through partial least squares analyses and
Escoufier (RV) coefficient. We tested whether the integration (measured by Escoufier
RV coefficient) of splanchnocranium and basicranium strength modules and their
covariation pattern (as analysed by partial least squares analysis) subordinate and
express similar integration results. A clear modularity was observed. The lack of disproportions in the skulls of domestic horse breeds (compared to dog and cat breeds,
for instance) might be an expression of the lack of single modules to evolve. On the
other side, integration might have a positive impact on survival as long as the selection pressure is along the trajectory of integrated variation.
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Anatomia, Histologia, Embryologia, 2021, vol. 50, núm. 5, p. 849-852Proyectos de investigación europeos
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