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Article Dans Une Revue Evolutionary Biology Année : 2020

Interrelations Between the Cranium, the Mandible and Muscle Architecture in Modern Domestic Dogs

Résumé

Many studies have attested to the consequences of the recent and intense artificial selection on the morphological variability of the cranium and mandible in domestic animals. However, the functional relations of the cranium with other constituents of the masticatory apparatus (the mandibles and the adductor muscles) have rarely been explored. Previous work has demon-strated strong relationships between the overall shape of the mandible and muscle data, however, drastic artificial selection in dogs has led to frequent malocclusions, suggesting a possible decoupling between the cranium and the mandible. Moreover, the more complex role of the cranium suggests that it is likely less impacted by, and correlated with, the architecture of the jaw muscles than the mandible. We explored the covariations between cranial and mandibular shape and between cranial shape and the masticatory muscle architecture. Shape analyses were conducted on 58 dogs from various breeds and we used muscle data previously obtained from the dissection of 48 of these dogs. The shape of the cranium was quantified using 3D geometric morphometric approaches. Principal component analyses (PCA) and two-block partial least square analyses (2B-PLS) were used to quantify the variations in cranial shape and the covariations with mandible shape and muscle archi-tecture, respectively. Interestingly, our results reveal strong covariations between cranial shape and mandibular shape and between cranial shape and masticatory muscles mass or physiological cross-sectional area, irrespective of whether size is taken into account or not. We conclude that the drastic artificial selection in domestic dogs has not tainted the integrity of the jaw system, which reinforces previous assumptions hypothesising that phenotypic variability in dogs may be limited by developmental factors.
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Dates et versions

hal-03948546 , version 1 (20-01-2023)

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Colline Brassard, Marilaine Merlin, Claude Guintard, Elodie Monchâtre-Leroy, Jacques Barrat, et al.. Interrelations Between the Cranium, the Mandible and Muscle Architecture in Modern Domestic Dogs. Evolutionary Biology, 2020, 47 (4), pp.308-324. ⟨10.1007/s11692-020-09515-9⟩. ⟨hal-03948546⟩
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