Geometric morphometrics for everyone: learning the basics in license-free software. Day/Time: Wednesday, April 15, 2020, 8AM-12PM. Description: The purpose of this workshop is to teach the basics of geometric morphometrics in free-license software to make it available to everyone. Organizers: Nicole Torres-Tamayo, Paleobiology Department, Museo Nacional de Ciencias Naturales (Madrid, Spain), ([email protected]); Antonio Profico, PalaeoHub, Department of Archaeology, York (United Kingdom), ([email protected]). Pre-registration required.

Description: ­­­Geometric morphometrics (GMM) is an important tool for addressing morphological variation and missing data estimation in virtual anthropology. During the last years, both license-free and comercial software have been used to do GMM, but the implementation of these techniques in license-free software and its transmission by means of specialized workshops and freely available on-line tutorials considerably expands its application in any virtual morphology lab. The purpose of this workshop is to teach the basics of GMM in free-license software, following these steps:

1) Landmark collection. Viewbox 4.0 is a commercial software that can also be used license‐free. It provides a toolkit for 3D landmark measurements, sliding and geometric methods for missing data estimation. We will learn how to measure landmarks and semi-landmarks in three steps:

  1. We will create a template of digitization
  2. We will use it to measure 2-3 specimens.
  3. We will estimate missing landmarks using the thin plate spline protocol.

2) GMM analyses. The 3D GMM workflow includes generalized Procrustes superimposition and principal component analysis to explore the patterns of morphological variation of the sample, and multivariate regression analyses for controlling the influence of one variable on another (for example, the effect of size on shape variation). After (semi)landmark collection, we will analyze the configurations through GMM. Due to time constraints, each attendee will measure only 2-3 specimens, but we will provide a set of 10 landmark configurations previously prepared by the co-organizers to carry out the subsequent GMM analyses. We will learn:

  1. How to perform GPA and PCA.
  2. How to visualize patterns of variation along principal components.
  3. How to analyze the effect of size on shape variation (allometry).

These analyses will be performed in the free-license/open source software Morphologika, MorphoJ and/or R depending on the interest/background of the audience.

Audience: Anyone interested in geometric morphometrics, morphological variation, virtual anthropology and fossil reconstruction.

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