Evolving Teeth Within a Stable Masticatory Apparatus in Orkney Mice |
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Authors: | Sabrina Renaud Ronan Ledevin Louise Souquet Helder Gomes Rodrigues Samuel Ginot Sylvie Agret Julien Claude Anthony Herrel Lionel Hautier |
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Institution: | 1.Laboratoire de Biométrie et Biologie Evolutive, UMR 5558, Université Lyon 1, CNRS,Villeurbanne Cedex,France;2.UMR5199 PACEA, Université de Bordeaux,Pessac,France;3.Institut de Génomique Fonctionnelle de Lyon, UMR 5242, CNRS, Ecole Normale Supérieure de Lyon, Université Claude Bernard Lyon 1,Lyon Cedex 07,France;4.Centre de Recherche sur la Paléobiodiversité et les Paléoenvironnements (CR2P), UMR CNRS 7207, CP38, Muséum national d’Histoire naturelle,Paris,France;5.Mécanismes adaptatifs et évolution (MECADEV), UMR 7179, CNRS, Funevol team, Muséum National d’Histoire Naturelle,Paris Cedex 5,France;6.Institut des Sciences de l’Evolution, Université de Montpellier, UMR5554 CNRS, IRD, EPHE,Montpellier Cedex,France |
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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. |
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