On the importance of examining the relationship between shape data and biologically meaningful variables. An example studying allometry with geometric morphometrics

Autores/as

  • Jesús Marugán-Lobón Departamento de Biología, Universidad Autónoma de Madrid
  • David Blanco Miranda Departamento de Biología, Universidad Autónoma de Madrid
  • Beatriz Chamero Departamento de Biología, Universidad Autónoma de Madrid
  • Hugo Martín Abad Departamento de Biología, Universidad Autónoma de Madrid

DOI:

https://doi.org/10.7203/sjp.28.2.17848

Palabras clave:

Gallus gallus, skull shape variation, 3D landmarks, Principal Components Analysis, multivariate regression

Resumen

Geometric morphometrics (GM) is a tool for the statistical analysis of shape on Cartesian landmark coordinates. However, because GM studies commonly focus on the description of morphological trends within shape space (or morphospace), the predictive power of multivariate statistics to understand morphological change remains underutilized. Here we show the protocols to study allometry in 3D with these tools on a postnatal growth series of the domestic chicken. We contrast three approaches: a ‘traditional’ one in which size variables are compared statistically, a Principal Components Analysis on size and shape scores (Procrustes form space), and a multivariate regression. In the latter approach we further used three different independent factors inherently related to ontogeny: skull centroid size, body weight, and age of the specimens. The results clearly stress the importance of studying shape change in relation to different causal factors (i.e., with regressions), demonstrating that, indeed, any independent variable or variables that make biological sense can be used to understand morphological change with GM

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Publicado

2020-07-20

Cómo citar

Marugán-Lobón, J., Blanco Miranda, D., Chamero, B., & Martín Abad, H. (2020). On the importance of examining the relationship between shape data and biologically meaningful variables. An example studying allometry with geometric morphometrics. Spanish Journal of Palaeontology, 28(2), 139–148. https://doi.org/10.7203/sjp.28.2.17848
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