Scaling of jaw muscle size and maximal bite force in finches

Meij, M.A.A.; Bout, Ron G.

doi:10.1242/jeb.01091

Cited by 122 publications

(142 citation statements)

References 22 publications

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“…Third, a larger size directly results in higher bite force owing to absolutely greater jaw adductor physiological cross-sectional areas (e.g. [30,[54][55][56][57]). These higher bite forces would facilitate prey processing, as prey hardness scales positively with size [58] and carnivorous bats are osteophagous [23,24,26].…”

Section: Discussionmentioning

confidence: 99%

Go big or go fish: morphological specializations in carnivorous bats

2016

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Specialized carnivory is relatively uncommon across mammals, and bats constitute one of the few groups in which this diet has evolved multiple times. While size and morphological adaptations for carnivory have been identified in other taxa, it is unclear what phenotypic traits characterize the relatively recent evolution of carnivory in bats. To address this gap, we apply geometric morphometric and phylogenetic comparative analyses to elucidate which characters are associated with ecological divergence of carnivorous bats from insectivorous ancestors, and if there is morphological convergence among independent origins of carnivory within bats, and with other carnivorous mammals. We find that carnivorous bats are larger and converged to occupy a subset of the insectivorous morphospace, characterized by skull shapes that enhance bite force at relatively wide gapes. Piscivorous bats are morphologically distinct, with cranial shapes that enable high bite force at narrow gapes, which is necessary for processing fish prey. All animal-eating species exhibit positive allometry in rostrum elongation with respect to skull size, which could allow larger bats to take relatively larger prey. The skull shapes of carnivorous bats share similarities with generalized carnivorans, but tend to be more suited for increased bite force production at the expense of gape, when compared with specialized carnivorans.

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Section: Discussionmentioning

confidence: 99%

Go big or go fish: morphological specializations in carnivorous bats

2016

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“…In the latter, positive allometry in PCSA was achieved both by changes in muscle size without changes in muscle architecture (Wainwright, 1987) and by changes in muscle architecture without changes in muscle size (Herrel et al, 2005). Moreover, in finches, bite-force positive allometry was proportional to allometric changes in jaw muscle size (Van der Meij and Bout, 2004). The scaling of feeding biomechanics in S. minor investigated in this study shows a somewhat different combination of results.…”

Section: Relationship Between Musculoskeletal Growth and Bite-force Gmentioning

confidence: 76%

Ontogenetic changes in jaw-muscle architecture facilitate durophagy in the turtleSternotherus minor

Pfaller

Gignac

Erickson

2011

Journal of Experimental Biology

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“…Through the example of the grazers the observation is true which means that the strong and narrow, tapered beak is in positive correlation with bite performance (Van der Meij & Bout 2004, Herrel et al 2005.…”

Section: Discussionmentioning

confidence: 94%

“…The grazer's pterygoid bone is longer and the palatine bone is shorter compare to the filter feeders (Marugán-Lobón & Buscalioni 2006). The birds with a ventrally directed beak have bigger and stronger jaw closure muscles compared to birds with an orthogonally directed beak (Van der Meij & Bout 2004).…”

Section: Discussionmentioning

confidence: 97%

The cranial morphometrics of the wildfowl (Anatidae)

2017

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Wildfowl (Anatidae) are a diverse group of birds and globally distributed. These birds feed by widely varying methods, there are generalist and specialist species. In a number of vertebrate taxa trophic specializations have led to distinct differences in the morphology of the skull, like in birds. Our knowledge and understanding of the relationship between cranial morphology and feeding mechanism of wildfowl are limited. The aim of this article is to increase our knowledge of the relationship between skull shape and foraging habits and find the identifiable attributes of the differently adapted groups. We used morphometric methods with 7 linear measurements of the skull. We used principal component (PC) analysis to identify the groups with different foraging habits. The PCs were related to measurements which represent the demanded muscle mass for feeding and the amount of capable food items. The grazers have a narrower bill and bigger bone surface which requires more muscle tissue than the broad billed filter-feeders. We observed the structural and functional differences between grazers and filter-feeders. There are no important differences in the bill measurements between omnivore dabbling and diving ducks. Only the bill is not enough to deduce the foraging habits.Keywords: cranial morphology, morphometrics, anatomy, prey composition, prey preference, foraging methods Összefoglalás A récefélék (Anatidae) családja nagy fajszámú, rendkívül diverz csoport. Táplálkozási típusuk szerint lehetnek generalisták és specialisták is. A koponya tulajdonságait és a különböző tápláléktípusokhoz való adaptációt számos gerinces esetében vizsgálták, azonban a récefélék esetében még kevésbé ismert a különbö-ző morfológiai és fenotípusos jellemzők környezettel való interakciója. Jelen cikkben a récefélék cranialis jegyeinek morfometriai elemzésével a táplálékpreferencia és a morfológiai jellemzők közötti összefüggést kerestük, és a különböző tápláléktípusokhoz adaptálódott formák közötti különbségeket próbáltuk megtalálni. A craniomorfometriai vizsgálat során -a koponyákon felvett hét méret felhasználásával -főkomponens-analízist végeztünk. A főkomponensek a táplálék felvételéhez szükséges izomzat nagyságával, valamint a felvehető táplálék mennyiségével hozhatók kapcsolatba. A szárazföldi növényekkel táplálkozó formák keskenyebb csőrrel, és az erőtelje-sebb állkapcsi és nyakizmok miatt nagyobb tapadási felszínnel rendelkeznek, mint a széles csőrű, filtráló specialisták. Felépítésbeli és funkcionális különbség a legelő és a filtráló specialisták között mutatható ki. Az omnivor úszó-és bukórécék között a csőr tulajdonságaiban a vizsgálat nem mutatott nagy eltérést, tehát a csőr önmagában nem informatív a táplálkozást illetően.

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Scaling of jaw muscle size and maximal bite force in finches

Cited by 122 publications

References 22 publications

Go big or go fish: morphological specializations in carnivorous bats

Go big or go fish: morphological specializations in carnivorous bats

Ontogenetic changes in jaw-muscle architecture facilitate durophagy in the turtleSternotherus minor

The cranial morphometrics of the wildfowl (Anatidae)

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