Organisms Diversity & Evolution

, Volume 17, Issue 1, pp 305–319 | Cite as

Regional differentiation of felid vertebral column evolution: a study of 3D shape trajectories

  • Marcela Randau
  • Andrew R. Cuff
  • John R. Hutchinson
  • Stephanie E. Pierce
  • Anjali Goswami
Original Article

Abstract

Recent advances in geometric morphometrics provide improved techniques for extraction of biological information from shape and have greatly contributed to the study of ecomorphology and morphological evolution. However, the vertebral column remains an under-studied structure due in part to a concentration on skull and limb research, but most importantly because of the difficulties in analysing the shape of a structure composed of multiple articulating discrete units (i.e. vertebrae). Here, we have applied a variety of geometric morphometric analyses to three-dimensional landmarks collected on 19 presacral vertebrae to investigate the influence of potential ecological and functional drivers, such as size, locomotion and prey size specialisation, on regional morphology of the vertebral column in the mammalian family Felidae. In particular, we have here provided a novel application of a method—phenotypic trajectory analysis (PTA)—that allows for shape analysis of a contiguous sequence of vertebrae as functionally linked osteological structures. Our results showed that ecological factors influence the shape of the vertebral column heterogeneously and that distinct vertebral sections may be under different selection pressures. While anterior presacral vertebrae may either have evolved under stronger phylogenetic constraints or are ecologically conservative, posterior presacral vertebrae, specifically in the post-T10 region, show significant differentiation among ecomorphs. Additionally, our PTA results demonstrated that functional vertebral regions differ among felid ecomorphs mainly in the relative covariation of vertebral shape variables (i.e. direction of trajectories, rather than in trajectory size) and, therefore, that ecological divergence among felid species is reflected by morphological changes in vertebral column shape.

Keywords

Geometric morphometrics Morphological evolution Regionalisation Phenotypic trajectory analysis Ecomorphology Axial skeleton 

Supplementary material

13127_2016_304_MOESM1_ESM.pdf (224 kb)
ESM 1(PDF 224 kb)
13127_2016_304_MOESM2_ESM.docx (43 kb)
ESM 2(DOCX 42 kb)

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Copyright information

© Gesellschaft für Biologische Systematik 2016

Authors and Affiliations

  1. 1.Department of Genetics, Evolution and EnvironmentUniversity College LondonLondonUK
  2. 2.Department of Comparative Biomedical Sciences and Structure & Motion LaboratoryThe Royal Veterinary CollegeLondonUK
  3. 3.Department of Organismic and Evolutionary Biology and Museum of Comparative ZoologyHarvard UniversityCambridgeUSA
  4. 4.Department of Earth SciencesUniversity College LondonLondonUK

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