Regional differentiation of felid vertebral column evolution: a study of 3D shape trajectories
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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.
KeywordsGeometric morphometrics Morphological evolution Regionalisation Phenotypic trajectory analysis Ecomorphology Axial skeleton
We thank the two peer reviewers for their excellent, constructive criticisms of the first draft of this paper. For access to museum collections, we thank R. Portela Miguez and R. Sabin at the Natural History Museum, London; M. Lowe and R. Asher at the University Museum of Zoology, Cambridge; C. Lefèvre at the Muséum National d’Histoire Naturelle, Paris; J. Chupasko at the Harvard Museum of Natural History, Cambridge; E. Westwig at the American Museum of Natural History, New York; W. Stanley at the Field Museum of Natural History, Chicago; and D. Lunde at the Smithsonian National Museum of Natural History, Washington D.C. This work was supported by Leverhulme Trust grant RPG 2013-124 to AG and JRH. This research received support from the SYNTHESYS project http://www.synthesys.info/ which is financed by European Community Research Infrastructure Action under the FP7 ‘Capacities’ Program. The SYNTHESYS grant was awarded to MR.
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Conflict of interest
The authors declare that they have no competing interests.
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