References of "Huby, Alessia"
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See detailFunctional diversity in biters: the evolutionary morphology of the oral jaw system in pacus, piranhas and relatives (Teleostei: Serrasalmidae)
Huby, Alessia ULiege; Lowie, Aurélien; Herrel, Anthony et al

in Biological Journal of the Linnean Society (2019)

Serrasalmid fishes form a highly specialized group of biters that show a large trophic diversity, ranging from pacus able to crush seeds to piranhas capable of cutting flesh. Their oral jaw system has ... [more ▼]

Serrasalmid fishes form a highly specialized group of biters that show a large trophic diversity, ranging from pacus able to crush seeds to piranhas capable of cutting flesh. Their oral jaw system has been hypothesized to be forceful, but variation in bite performance and morphology with respect to diet has not previously been investigated. We tested whether herbivorous species have higher bite forces, larger jaw muscles and more robust jaws than carnivorous species. We measured in vivo and theoretical bite forces in 27 serrasalmid species. We compared the size of the adductor mandibulae muscle, the jaw mechanical advantages, the type of jaw occlusion, and the size and shape of the lower jaw. We also examined the association between bite performance and functional morphological traits of the oral jaw system. Contrary to our predictions, carnivorous piranhas deliver stronger bites than their herbivorous counterparts. The size of the adductor mandibulae muscle varies with bite force and muscles are larger in carnivorous species. Our study highlights an underestimated level of functional morphological diversity in a fish group of exclusive biters. We provide evidence that the trophic specialization towards carnivory in piranhas results from changes in the configuration of the adductor mandibulae muscle and the lower jaw shape, which have major effects on bite performance and bite strategy. [less ▲]

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See detailActinopterygians: Head, Jaws and Muscles
Huby, Alessia ULiege; Parmentier, Eric ULiege

in Ziermann, Janine M.; Diaz, Raul E.; Diogo, Rui (Eds.) Heads, Jaws, and Muscles - Anatomical, Functional, and Developmental Diversity in Chordate Evolution (2019)

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See detailWhat do the Brazilian piranhas have to tell us?
Raick, Xavier ULiege; Huby, Alessia ULiege; Kurchevski, Gregório et al

Conference (2018, December 15)

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See detailComparative morpho-functional study of the feeding system in different species of Serrasalmidae (Teleostei: Characiformes)
Huby, Alessia ULiege; Lowie, Aurélien; Herrel, Anthony et al

Conference (2018, April 26)

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See detailEtude morpho-fonctionnelle comparée du système de prise de nourriture chez différentes espèces de Serrasalmidae (Characiformes)
Huby, Alessia ULiege; LOWIE, Aurélien; HERREL, Anthony et al

Conference (2018, March 29)

Si la majorité des histoires sur les piranhas sont généralement sanglantes et exagérées, elles reposent néanmoins sur un trait de caractère : la force développée par leurs mâchoires pendant la prise de ... [more ▼]

Si la majorité des histoires sur les piranhas sont généralement sanglantes et exagérées, elles reposent néanmoins sur un trait de caractère : la force développée par leurs mâchoires pendant la prise de nourriture est réellement exceptionnelle. Il a en effet été avancé que les piranhas noirs (Serrasalmus rhombeus) peuvent exercer une force de morsure très importante puisque, à taille égale, elle serait trois fois plus puissante que celle des grands requins blancs. Cette force ne serait pas le seul apanage des piranhas mangeurs de chair, car une force importante semble aussi requise chez les espèces-sœurs herbivores pour pouvoir casser les coquilles des graines et des fruits dont elles se nourrissent. La force développée par les mâchoires de ces herbivores pendant la prise de nourriture n’a cependant jamais été étudiée, ni comparée avec celle des piranhas carnivores. L’objectif de ce travail de recherche est de mesurer des forces de morsure chez diverses espèces de Serrasalmidae et de comparer le système de prise de nourriture des deux régimes alimentaires (carnivore vs herbivore). Différentes approches ont été réalisées. (1) Des forces de morsure ont été mesurées in-vivo chez quatorze espèces de poissons Serrasalmidae (7 espèces carnivores vs 7 espèces herbivores) à l’aide d’un transducteur de force piézo-électrique. (2) Des forces de morsure théoriques ont été calculées à partir de la section transversale du muscle adducteur associé aux mâchoires. (3) La morphologie du muscle adducteur de la mandibule et la forme de la mâchoire inférieure ont été examinées chez ces mêmes espèces via des méthodes de dissection et de morphométrie géométrique. (4) Pour la mâchoire inférieure, des rapports de bras de levier ont été estimés pour déterminer et comparer le mode de transmission des forces de morsure. Quelle que soit l’approche envisagée, les espèces carnivores ont une valeur de force de morsure significativement plus élevée que celle des espèces herbivores de même taille et même masse. Le muscle adducteur de la mandibule est d’ailleurs beaucoup plus développé chez les espèces carnivores (1.5% de la masse totale du corps) par rapport aux espèces herbivores (0.4%). De plus, les carnivores ont une forme de mâchoire inférieure distincte de celle de leurs cousins herbivores. La mandibule des espèces carnivores est plus allongée avec un plus grand nombre de dents disposées sur une structure dentigère plus grande. La mandibule possède aussi un os articulaire réduit. Cette forme amène l’alignement de l’articulation « carré-articulaire » sur la ligne d’occlusion des dents. Par conséquent, la mâchoire des piranhas présente des points de ressemblance avec une paire de ciseaux. Les espèces herbivores ont par contre un os articulaire plus grand et plus large qui modifie la morphologie de la mâchoire inférieure avec le positionnement des dents au niveau antérieur. Le système de prise de nourriture rencontré chez les herbivores se rapproche de celui d’un étau. [less ▲]

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See detailSerrasalmidae 2018 : rapport de mission
Raick, Xavier ULiege; Huby, Alessia ULiege

Report (2018)

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See detailAdductor mandibulae muscle and lower jaw morphology: an approach to determine bite strategies in piranhas and relatives (Serrasalmidae, Characiformes, Teleostei)
Huby, Alessia ULiege; Parmentier, Eric ULiege

Poster (2017, November 23)

Serrasalmidae (98 species) is a large monophyletic group of South American freshwater fishes. They have different dietary preferences ranging from the predominantly herbivorous or frugivorous pacus to the ... [more ▼]

Serrasalmidae (98 species) is a large monophyletic group of South American freshwater fishes. They have different dietary preferences ranging from the predominantly herbivorous or frugivorous pacus to the omnivorous or primarily carnivorous piranhas. Flesh-eating piranhas are supposed to have proportionally the most powerful bite forces among vertebrates but it has never been compared with those of plant, fruit and seed-eating species. Moreover, the bite strategy has never been explored in this family: is there a difference between carnivorous piranhas and herbivorous relatives? In the present study, we used the adductor mandibulae muscle and the lower jaw as models to answer this questioning through morphometric methods. We found that flesh-eating piranhas have a more developed adductor mandibulae muscle than seed-eating species which in turn have a larger jaw muscle than plant-eating species. The dorsomedial section of the jaw muscle (pars malaris) is the most developed in carnivorous species whereas it is the ventrolateral section (pars rictalis) in herbivorous species. We also distinguish two characteristic shapes of lower jaw that are related to dietary preferences. Results suggest different bite strategies: flesh-eating species possess a "scissor-like" way of feeding whereas the plant, fruit and seed-eating species show "vise-like" system. [less ▲]

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See detailRelationship between jaw morphology, bite performance and diet in Serrasalmidae (Characiformes, Teleostei)
Huby, Alessia ULiege; Lowie, Aurélien; Herrel, Anthony et al

Conference (2016, December 16)

Serrasalmidae are mainly known for “piranhas” and their negative reputation of ferocious predatory fishes. A recent study demonstrated that the piranha $Serrasalmus rhombeus£ had an extreme bite force ... [more ▼]

Serrasalmidae are mainly known for “piranhas” and their negative reputation of ferocious predatory fishes. A recent study demonstrated that the piranha $Serrasalmus rhombeus£ had an extreme bite force that is even proportionally greater than that of the white shark. However, these sharp teeth fishes represent only a minority of Serrasalmidae. Other serrasalmid species (pacus and myleus) feed on plants, fruits or seeds and their bite force and feeding capacities are still uninvestigated. In the present research, in vivo bite forces were measured and compared according to jaw morphology in ten species of Serrasalmidae including six herbivorous and four carnivorous species. The Bite Force Quotient (BFQ) was calculated for each individual to compare the jaw strength across species. The results of the analysis showed that species feeding on fins and fish flesh have a significant greater bite force than species feeding on plants, fruits or seeds. This difference can be explained by the larger adductor mandibulae muscle in carnivorous species which have comparatively longer and higher skull than herbivorous species. In addition, there is a significant difference in the lower jaw morphology between piranhas and pacus and relatives. The piranha species have longer lower jaws than pacus and myleus species which have shorter and higher lower jaws. This study shows that the Serrasalmidae family regroups remarkable biters whose bite performance is mostly related to diet. [less ▲]

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