Covariación ontogénica en el endocráneo de Pan troglodytes / Ontogenetic covariation in the endocranium of Pan troglodytes

Autores/as

  • Marina Sardi Universidad Nacional de La Plata. Argentina
  • Jimena Barbeito-Andrés
  • Fernando Ventrice
  • Fernando Ramírez-Rozzi
  • Marisol Anzelmo
  • Anne-Marie Guihard-Costa

Resumen

RESUMEN Diversos estudios proponen que el neurocráneo en Homo sapiens es una estructura integrada y que la morfología de la bóveda y la base se asocia con modificaciones del cerebro. En este estudio se evaluó la covariación ontogénica en el endocráneo de Pan troglodytes, otro primate altamente encefalizado. Se analizaron 52 reconstrucciones 3D derivadas de tomografías computadas de individuos adultos y subadultos. Una vez segmentadas las cavidades endocraneanas, se relevaron 27 landmarks. A partir de su configuración, se obtuvieron el tamaño del centroide y las coordenadas de Procrustes y se realizó Análisis de Componentes Principales, regresión, correlación, ANOVA y análisis F de Goodall a fin de evaluar los cambios de tamaño y forma respecto de la edad y las alometrías. Los cambios en forma están fuertemente integrados y se producen hasta etapas tardías de la ontogenia: elongación de la bóveda y la base, distanciamiento entre el foramen magnun y la placa cribiforme, retroflexión del ángulo basicraneano y descenso de los polos temporales. A partir del análisis PLS se observó que los cambios en la base y la bóveda covarían, pero cuando se ajustó el efecto alométrico, dicha covariación se hizo no significativa, tal como ocurre en Homo sapiens. Esto sugiere que el aumento ontogénico del volumen endocraneano -en relación con el crecimiento cerebral- constituye un factor común de integración entre la bóveda y la base en ambas especies. Sin embargo, es probable que en el chimpancé se sume la influencia de distintas estructuras faciales que promuevan variación y covariación en el endocráneo.

PALABRAS CLAVE chimpancé; tomografía computada; integración; cerebro 

ABSTRACT Several studies propose that the neurocranium in Homo sapiens is an integrated structure, being the growing brain the factor that influences the vault and the base morphology. The goal of this study is to assess endocranial ontogenetic covariation in Pan troglodytes, another encephalized primate. Fifty-two 3D reconstructions derived from computed tomographies of adult and subadult specimens were analyzed. After segmentation of the endocranial volumes, twenty-seven landmarks were registered. Through their configuration, centroid size and Procrustes coordinates were obtained, and Principal Components Analysis, regression, correlation, ANOVA and Goodall’s F-test were performed in order to evaluate size and shape changes against age and allometries. The results indicated that significant morphological ontogenetic shape changes are highly integrated and they occur up to the late ontogeny: elongation of the vault and the base, separation of the foramen magnum and the cribiform plate, retroflection of the basicranial angle, and descent of the temporal poles. By means of PLS analysis, a significant covariation between the vault and the base was obtained. However, when the allometric effect was adjusted, the covariation became non-significant, as occurs in Homo sapiens. This suggests that the ontogenetic increase in the endocranial volume —related to the growing brain— may be a common integrative factor between the vault and the base in both species. Nonetheless, different facial structures are also likely to promote variation and covariation in the chimpanzee’s endocranium.

KEY WORDS chimpanzee; computed tomography; integration; brain

 

doi: 10.17139/raab.2014.0016.02.02

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25.04.2014

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Sardi, M., Barbeito-Andrés, J., Ventrice, F., Ramírez-Rozzi, F., Anzelmo, M., & Guihard-Costa, A.-M. (2014). Covariación ontogénica en el endocráneo de Pan troglodytes / Ontogenetic covariation in the endocranium of Pan troglodytes. Revista Argentina De Antropología Biológica, 16(2), 79–91. Recuperado a partir de https://revistas.unlp.edu.ar/raab/article/view/800

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