Decoupled ontogeny of in vivo bite force and mandible morphology reveals effects of weaning and sexual maturation in mice - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Biological Journal of the Linnean Society Année : 2020

Decoupled ontogeny of in vivo bite force and mandible morphology reveals effects of weaning and sexual maturation in mice

Résumé

The link between performance, morphology and their sources of variation is a major target of evolutionary functional biology. In vertebrates, many studies have linked in vivo bite force to skull morphology, mostly at the interspecific level. Within species, however, the ontogeny of bite force, in relation to the development of the mandible, remains poorly known, despite its relevance for life history and for the co-evolution of form and function. Here, ontogenetic trajectories of bite force, correlated with mandible size and shape, are reported for the first time in a wild-derived colony of laboratory mice. Bite forces were measured in vivo and mandible morphology was assessed using geometric morphometrics. Most coordinated changes in morphology and in vivo bite force occur during the first stages of growth, prior to weaning. Mandible shape stabilizes after day 23. The increases in mandible size and body mass slow down around day 40, but still increase during adulthood. Despite slowing down after weaning, bite force increases through a second phase during sexual maturation (days 30-40). This may be linked to the progressive tempering of weaning stress, continued growth and synchronization of the muscular and osteological systems, together with hormonal changes, as we observed a concomitant appearance of sexual dimorphism.
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Dates et versions

hal-02994437 , version 1 (07-11-2020)

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Samuel Ginot, Lionel Hautier, Sylvie Agret, Julien Claude. Decoupled ontogeny of in vivo bite force and mandible morphology reveals effects of weaning and sexual maturation in mice. Biological Journal of the Linnean Society, 2020, 129 (3), pp.558-569. ⟨10.1093/biolinnean/blz196⟩. ⟨hal-02994437⟩
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