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 language | English (US) |
|---|---|
| Pages (from-to) | 291-310 |
| Number of pages | 20 |
| Journal | Anatomical Record |
| Volume | 301 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 1 2018 |
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Keywords
- adaptation
- masticatory system
- muscle
- primates
- vertebrates
ASJC Scopus subject areas
- Anatomy
- Biotechnology
- Histology
- Ecology, Evolution, Behavior and Systematics
Cite this
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 journal › Article
}
TY - JOUR
T1 - Do Muscles Constrain Skull Shape Evolution in Strepsirrhines?
AU - Fabre, Anne Claire
AU - Perry, Jonathan M G
AU - Hartstone-Rose, Adam
AU - Lowie, AuróLien
AU - Boens, Andy
AU - Dumont, MaÏtena
PY - 2018/2/1
Y1 - 2018/2/1
N2 - 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.
AB - 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.
KW - adaptation
KW - masticatory system
KW - muscle
KW - primates
KW - vertebrates
UR - http://www.scopus.com/inward/record.url?scp=85040649117&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85040649117&partnerID=8YFLogxK
U2 - 10.1002/ar.23712
DO - 10.1002/ar.23712
M3 - Article
C2 - 29330958
AN - SCOPUS:85040649117
VL - 301
SP - 291
EP - 310
JO - Anatomical Record
JF - Anatomical Record
SN - 1932-8486
IS - 2
ER -