Inferring locomotor behaviours in Miocene New World monkeys using finite element analysis, geometric morphometrics and machine-learning classification techniques applied to talar morphology
Püschel, Thomas (University of Manchester. School of Earth and Environmental Sciences)
Marcé Nogué, Jordi (Institut Català de Paleontologia Miquel Crusafont)
Gladman, Justin T. (Duke University. Department of Engineering, Shared Materials Instrumentation Facility)
Bobe, René (University of Oxford. Institute of Cognitive and Evolutionary Anthropology)
Sellers, William I. (University of Manchester. School of Earth and Environmental Sciences)

Data:	2018
Resum:	The talus is one of the most commonly preserved post-cranial elements in the platyrrhine fossil record. Talar morphology can provide information about postural adaptations because it is the anatomical structure responsible for transmitting body mass forces from the leg to the foot. The aim of this study is to test whether the locomotor behaviour of fossil Miocene platyrrhines could be inferred from their talus morphology. The extant sample was classified into three different locomotor categories and then talar strength was compared using finite-element analysis. Geometric morphometrics were used to quantify talar shape and to assess its association with biomechanical strength. Finally, several machine-learning (ML) algorithms were trained using both the biomechanical and morphometric data from the extant taxa to infer the possible locomotor behaviour of the Miocene fossil sample. The obtained results show that the different locomotor categories are distinguishable using either biomechanical or morphometric data. The ML algorithms categorized most of the fossil sample as arboreal quadrupeds. This study has shown that a combined approach can contribute to the understanding of platyrrhine talar morphology and its relationship with locomotion. This approach is likely to be beneficial for determining the locomotor habits in other fossil taxa.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Platyrrhini ; Finite-element modelling ; Morphometrics ; Talus ; Statistical learning ; Positional behaviour
Publicat a:	Journal of the Royal Society Interface, Vol. 15, Núm. 146 (September 2018) , art. 20180520, ISSN 1742-5662

DOI: 10.1098/rsif.2018.0520
PMID: 30257926

16 p, 1.5 MB

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