Do Muscles Constrain Skull Shape Evolution in Strepsirrhines?

Anne Claire Fabre, Jonathan M G Perry, Adam Hartstone-Rose, AuróLien Lowie, Andy Boens, MaÏtena Dumont

Research output: Contribution to journalArticle

Abstract

Despite great interest and decades of research, the musculoskeletal relationships of the masticatory system in primates are still not fully understood. However, without a clear understanding of the interplay between muscles and bones it remains difficult to understand the functional significance of morphological traits of the skeleton. Here, we aim to study the impacts of the masticatory muscles on the shape of the cranium and the mandible as well as their co-variation in strepsirrhine primates. To do so, we use 3D geometric morphometric approaches to assess the shape of each bone of the skull of 20 species for which muscle data are available in the literature. Impacts of the masticatory muscles on the skull shape were assessed using non-phylogenetic regressions and phylogenetic regressions whereas co-variations were assessed using two-blocks partial least square (2B-PLS) and phylogenetic 2B-PLS. Our results show that there is a phylogenetic signal for skull shape and masticatory muscles. They also show that there is a significant impact of the masticatory muscles on cranial shape but not as much as on the mandible. The co-variations are also stronger between the masticatory muscles and cranial shape even when taking into account phylogeny. Interestingly, the results of co-variation between the masticatory muscles and mandibular shape show a more complex pattern in two different directions to get strong muscles associated with mandibular shape: a folivore way (with the bamboo lemurs and sifakas) and a hard-object eater one (with the aye-aye). Anat Rec, 301:291–310, 2018.

Original languageEnglish (US)
Pages (from-to)291-310
Number of pages20
JournalAnatomical Record
Volume301
Issue number2
DOIs
StatePublished - Feb 1 2018

Fingerprint

Masticatory Muscles
skull
Skull
muscle
Muscles
muscles
Mandible
Primates
mandible (bone)
Lemur
phylogeny
Stomatognathic System
phylogenetics
Bone and Bones
primate
bone
Phylogeny
Least-Squares Analysis
Skeleton
bones

Keywords

  • adaptation
  • masticatory system
  • muscle
  • primates
  • vertebrates

ASJC Scopus subject areas

  • Anatomy
  • Biotechnology
  • Histology
  • Ecology, Evolution, Behavior and Systematics

Cite this

Fabre, A. C., Perry, J. M. G., Hartstone-Rose, A., Lowie, A., Boens, A., & Dumont, M. (2018). Do Muscles Constrain Skull Shape Evolution in Strepsirrhines? Anatomical Record, 301(2), 291-310. https://doi.org/10.1002/ar.23712

Do Muscles Constrain Skull Shape Evolution in Strepsirrhines? / Fabre, Anne Claire; Perry, Jonathan M G; Hartstone-Rose, Adam; Lowie, AuróLien; Boens, Andy; Dumont, MaÏtena.

In: Anatomical Record, Vol. 301, No. 2, 01.02.2018, p. 291-310.

Research output: Contribution to journalArticle

Fabre, AC, Perry, JMG, Hartstone-Rose, A, Lowie, A, Boens, A & Dumont, M 2018, 'Do Muscles Constrain Skull Shape Evolution in Strepsirrhines?', Anatomical Record, vol. 301, no. 2, pp. 291-310. https://doi.org/10.1002/ar.23712
Fabre AC, Perry JMG, Hartstone-Rose A, Lowie A, Boens A, Dumont M. Do Muscles Constrain Skull Shape Evolution in Strepsirrhines? Anatomical Record. 2018 Feb 1;301(2):291-310. https://doi.org/10.1002/ar.23712
Fabre, Anne Claire ; Perry, Jonathan M G ; Hartstone-Rose, Adam ; Lowie, AuróLien ; Boens, Andy ; Dumont, MaÏtena. / Do Muscles Constrain Skull Shape Evolution in Strepsirrhines?. In: Anatomical Record. 2018 ; Vol. 301, No. 2. pp. 291-310.
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