Holocene population history of the Sabana de Bogot√° region, Northern South America: An assessment of the craniofacial shape variation

These results reveal that there is a greater variation than expected if only random processes were involved in the phenotypic divergence observed, leaving other directional factors such as selection and phenotypic plasticity responsible for the disproportionality between among- and within-population craniofacial variation

Miguel Delgado


Scholarcy highlights

  • The Sabana de Bogota in the eastern highlands of Colombia is a well-known archaeological region that has played an important role in the discussion of the initial human expansion into South America
  • Shape changes are represented as TPS-grids showing deformations for the principal components positive/negative scores and colored coded Jacobian expansion/contraction factors which measure the degree of local expansion or contraction of the grid
  • The early-middle Holocene and MH groups in both PC analyses appear similar to each other when compared with late Holocene samples, an independent Principal component analysis investigating both samples shows marked shape differences with well defined clusters as indicated by the ellipses of 95% confidence intervals
  • The results presented revealed a transformation of the skull morphology during the final late Holocene
  • In the same way, according to Barrientos, the structural-morphological-physiological- discontinuity implicate the existence of interruptions in the transmission of genetic-epigenetic information related to the local or total extinction of the involved community of reproduction either a lineage, population or species
  • Instead it supports a complex population history scenario where population contractions, extinctions, dispersals and assimilations along with dietary adaptations took place during the last 10,000 years of human evolution in the SB region

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