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Evolving Teeth Within a Stable Masticatory Apparatus in Orkney Mice
- Source :
- Evolutionary Biology, Evolutionary Biology, Springer, 2018, 45 (4), pp.405-424. ⟨10.1007/s11692-018-9459-6⟩
- Publication Year :
- 2018
- Publisher :
- Springer Science and Business Media LLC, 2018.
-
Abstract
- Mice from the Orkney archipelago exhibit an important diversity regarding molar shape. While on some islands mice display a usual dental pattern, teeth from other islands display additional cusplets and unusual phenotypes that may constitute case studies for evaluating the potential functional relevance of dental changes. We developed a multifaceted approach combining 2D and 3D geometric morphometrics, dental topography, dental wear, biomechanics, estimations of masticatory muscles force, and in vivo bite force on wild-derived lab descendants exemplifying the two extreme dental morphologies. The two strains differed in the geometry of the upper and lower tooth rows, and in the topography of the upper row only. Surprisingly, the most unusual tooth morphology appeared as the least complex because tooth simplification overwhelmed the signal provided by the occurrence of additional cusplets. No difference in bite force nor muscle force was evidenced, showing that the important change in dental morphology was accommodated without major changes in the rest of the masticatory apparatus. The evolution of unusual dental phenotypes was possibly fueled by drift and inbreeding in small and isolated populations on remote islands of the archipelago. No functional counter-selection impeded this diversification, since the unusual dental phenotypes did not disrupt occlusion and mastication.
- Subjects :
- 0106 biological sciences
0301 basic medicine
Molar
Morphometrics
Orthodontics
geography
geography.geographical_feature_category
[SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE]
Mandible
Biology
010603 evolutionary biology
01 natural sciences
Masticatory force
Bite force quotient
stomatognathic diseases
03 medical and health sciences
030104 developmental biology
Biting
stomatognathic system
Archipelago
Mastication
ComputingMilieux_MISCELLANEOUS
Ecology, Evolution, Behavior and Systematics
Subjects
Details
- ISSN :
- 19342845 and 00713260
- Volume :
- 45
- Database :
- OpenAIRE
- Journal :
- Evolutionary Biology
- Accession number :
- edsair.doi.dedup.....109c61854ff22741cbc6a7c074a27303