Bite Force Performance, Fluctuating Asymmetry and Antisymmetry in the Mandible of Inbred and Outbred Wild-Derived Strains of Mice (Mus musculus domesticus)

Ginot, Samuel; Agret, Sylvie; Julien, Claude

doi:10.1007/s11692-018-9450-2

Cited by 16 publications

(20 citation statements)

References 68 publications

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“…The interaction of individuals and sides, which expresses directional asymmetry (DA), showed significative and higher values than FA. This lateral asymmetry could be associated to bite side preference (lateralisation), a phenomenon that has been detected in other mammals (Ginot et al, ; Parés‐Casanova & Bravi, ; Zamanlu et al, ). This DA would have no effect on stomatognathic system, for example it would not be a dissymmetry, understood as a defect of symmetry rather than an absence of symmetry.…”

Section: Discussionmentioning

confidence: 69%

“…DA can be derived both from genetic inheritance, as from features of functional importance acquired to adapt to certain environment constraints (Carter, Osborne, & Houle, 2009). AS is the third kind of bilateral asymmetry and is characterized by low kurtosis values of difference between left and right side values (Ginot, Agret, & Claude, 2018). A bimodal distribution of side difference values is typical for AS.…”

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confidence: 99%

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Patterns of mandibular asymmetries in two types of companion rabbits

Casanova

Cabello

2019

Anat Histol Embryol

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Developmental instability hypothesis suggests that asymmetric variation can partially reflect the body's inability to buffer environmental and/or genetic perturbations. Fluctuating asymmetry (FA), that is random differences between the left and right sides of body features that are symmetric at the population level, can assess this approach. Another kind of asymmetry is directional asymmetry (DA) which appears when the left and right sides differ consistently from each other. Extreme selection for morphological traits, as appear in some companion rabbits selected for a paedomorphic (dwarf rabbits) or gerontomorphic (belier rabbits) appearance, may cause abnormal functional conditions, which in turn could be expressed as significative degrees of asymmetries. To study these phenomena, we analysed 62 mandibles of companion rabbits (20 beliers and 42 dwarfs) by means of geometric morphometric methods and quantified their size and shape asymmetric variation (both FA and DA) using 18 landmarks on the lateral side. FA was present in both types but in different degrees, being higher among dwarfs. It is considered that this type is subject to deeper changes than among beliers, and therefore, there is higher pressure on the phenotype. This observation could be assumed to be an adaptive response, coming out as FA. The presence of DA was significative and similar for two types. This likely indicates common masticatory lateralization, a pattern that has been detected in other domestic mammals. The methodological framework presented in this study can be valuable for future works focused on genetically and/or environmentally related form study in pets.

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Section: Discussionmentioning

confidence: 69%

mentioning

confidence: 99%

Patterns of mandibular asymmetries in two types of companion rabbits

Casanova

Cabello

2019

Anat Histol Embryol

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“…This could have negatively affected the biomechanical capabilities of the mandible, as increased developmental instability and fluctuating asymmetry in the craniodental region has been suggested by some researchers to be associated with inbreeding and homozygosity (Leamy et al 2002; Schaefer et al 2006). However, others have found no evidence for this relationship (Markow, 1995), and a recent study on mice found no impact of inbreeding depression on bite force (Ginot et al 2018).…”

Section: Discussionmentioning

confidence: 99%

Population fragmentation leads to morpho-functional variation in British red squirrels (Sciurus vulgaris)

Cox

Morris

Kitchener

2019

Preprint

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26It is well-known that population fragmentation and isolation can lead to rapid morphological 27 and functional divergence, with the effect being particularly well-documented in rodents. Here, 28 we investigated whether such a phenomenon could be identified in the Eurasian red squirrel 29 (Sciurus vulgaris), which was once widespread across the majority of Great Britain, but 30 suffered a severe population decline across the 20 th century, leaving a highly fragmented 31 distribution. The aim was to test for morphological and biomechanical variation of the 32 mandible between the remaining British red squirrel populations. Linear and geometric 33 morphometric methods were used to analyse shape in a sample of over 250 squirrel mandibles 34 from across the UK and Germany. Canonical variates analysis identified significant shape 35 differences between most British red squirrel populations, but particularly between squirrels 36 from Formby and those from other populations. Linear measurements showed that Formby red 37 squirrels have a significantly lower mechanical advantage of the temporalis muscle, indicating 38 that they are less efficient at gnawing. We suggest that this difference may be related to past 39 supplemental feeding of Formby squirrels with peanuts, which are less mechanically resistant 40 than food items that occur naturally in the diet of British red squirrels. 41 42 43 44 45 46 47 48It is well-established that fragmentation of a population and the resulting isolation of the 52

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“…This could have negatively affected the biomechanical capabilities of the mandible, as increased developmental instability and fluctuating asymmetry in the craniodental region have been suggested by some researchers to be associated with inbreeding and homozygosity (Leamy, Routman & Cheverud, 2002;Schaefer et al, 2006). In contrast, others have found no evidence for this relationship (Markow, 1995), and a recent study on mice found no impact of inbreeding depression on bite force (Ginot, Agret & Claude, 2018).…”

Section: Discussionmentioning

confidence: 99%

Morphological and functional variation between isolated populations of British red squirrels (Sciurus vulgaris)

et al. 2020

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Isolation due to habitat fragmentation can lead to morphological and functional variation between populations, with the effect being well documented in rodents. Here, we investigated whether such morphological variation could be identified between British populations of the Eurasian red squirrel (Sciurus vulgaris). This species was once widespread across Great Britain, but suffered a severe population decline across the 20th century, leaving a highly fragmented distribution. The aim was to test for morphological and biomechanical variation of the mandible between the remaining British red squirrel populations, and between British and continental European red squirrels. Linear and geometric morphometric methods were used to analyse shape in a sample of over 250 red squirrel hemi-mandibles from across Britain plus a sample from Germany representing the central European subspecies. Procrustes ANOVA identified significant shape variation between populations, with particularly distinct differences being noted between red squirrels from Germany and several British red squirrel populations, which may reflect their evolutionary history. Linear biomechanical measurements showed that the red squirrels from Formby and Jersey had a significantly lower mechanical advantage of the temporalis muscle than other British populations, suggesting they were less efficient at gnawing. This functional difference may be related to many factors, such as founder effect, potential inbreeding and/or past supplemental feeding with less mechanically resistant food items.

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Bite Force Performance, Fluctuating Asymmetry and Antisymmetry in the Mandible of Inbred and Outbred Wild-Derived Strains of Mice (Mus musculus domesticus)

Cited by 16 publications

References 68 publications

Patterns of mandibular asymmetries in two types of companion rabbits

Patterns of mandibular asymmetries in two types of companion rabbits

Population fragmentation leads to morpho-functional variation in British red squirrels (Sciurus vulgaris)

Morphological and functional variation between isolated populations of British red squirrels (Sciurus vulgaris)

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