Limits...
3D bite modeling and feeding mechanics of the largest living amphibian, the Chinese giant salamander Andrias davidianus (Amphibia:Urodela).

Fortuny J, Marcé-Nogué J, Heiss E, Sanchez M, Gil L, Galobart À - PLoS ONE (2015)

Bottom Line: Giant salamanders perform asymmetrical strikes.These strikes are unusual and specialized behavior but might indeed be beneficial in such sit-and-wait or ambush-predators to capture laterally approaching prey.Given their basal position within extant salamanders and their "conservative" morphology, cryptobranchids may be useful models to reconstruct the feeding ecology and biomechanics of different members of early tetrapods and amphibians, with similar osteological and myological constraints.

View Article: PubMed Central - PubMed

Affiliation: Institut Català de Paleontologia Miquel Crusafont, Sabadell, Spain; Universitat Politècnica de Catalunya-BarcelonaTech, Terrassa, Spain.

ABSTRACT
Biting is an integral feature of the feeding mechanism for aquatic and terrestrial salamanders to capture, fix or immobilize elusive or struggling prey. However, little information is available on how it works and the functional implications of this biting system in amphibians although such approaches might be essential to understand feeding systems performed by early tetrapods. Herein, the skull biomechanics of the Chinese giant salamander, Andrias davidianus is investigated using 3D finite element analysis. The results reveal that the prey contact position is crucial for the structural performance of the skull, which is probably related to the lack of a bony bridge between the posterior end of the maxilla and the anterior quadrato-squamosal region. Giant salamanders perform asymmetrical strikes. These strikes are unusual and specialized behavior but might indeed be beneficial in such sit-and-wait or ambush-predators to capture laterally approaching prey. However, once captured by an asymmetrical strike, large, elusive and struggling prey have to be brought to the anterior jaw region to be subdued by a strong bite. Given their basal position within extant salamanders and their "conservative" morphology, cryptobranchids may be useful models to reconstruct the feeding ecology and biomechanics of different members of early tetrapods and amphibians, with similar osteological and myological constraints.

No MeSH data available.


Related in: MedlinePlus

Von Mises Stress results in MPa of Bilateral loading under an anterior (A-F) or a posterior prehension (G-L) and a gape angle of 6°.Subadult specimen under the anterior prehension (A-C) and posterior prehension (G-I). Adult specimen under the anterior prehension (D-F) and posterior prehension (J-L). Dorsal views (A,D,G,J) and ventral views (B,E,H,K).
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4390218&req=5

pone.0121885.g002: Von Mises Stress results in MPa of Bilateral loading under an anterior (A-F) or a posterior prehension (G-L) and a gape angle of 6°.Subadult specimen under the anterior prehension (A-C) and posterior prehension (G-I). Adult specimen under the anterior prehension (D-F) and posterior prehension (J-L). Dorsal views (A,D,G,J) and ventral views (B,E,H,K).

Mentions: The forces of both models adult (A) and subadult (B) are related to the variation of the volume (V) of the skull, adapting the equations proposed by [38] to three-dimensional models (Figs. 2 and 3).


3D bite modeling and feeding mechanics of the largest living amphibian, the Chinese giant salamander Andrias davidianus (Amphibia:Urodela).

Fortuny J, Marcé-Nogué J, Heiss E, Sanchez M, Gil L, Galobart À - PLoS ONE (2015)

Von Mises Stress results in MPa of Bilateral loading under an anterior (A-F) or a posterior prehension (G-L) and a gape angle of 6°.Subadult specimen under the anterior prehension (A-C) and posterior prehension (G-I). Adult specimen under the anterior prehension (D-F) and posterior prehension (J-L). Dorsal views (A,D,G,J) and ventral views (B,E,H,K).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4390218&req=5

pone.0121885.g002: Von Mises Stress results in MPa of Bilateral loading under an anterior (A-F) or a posterior prehension (G-L) and a gape angle of 6°.Subadult specimen under the anterior prehension (A-C) and posterior prehension (G-I). Adult specimen under the anterior prehension (D-F) and posterior prehension (J-L). Dorsal views (A,D,G,J) and ventral views (B,E,H,K).
Mentions: The forces of both models adult (A) and subadult (B) are related to the variation of the volume (V) of the skull, adapting the equations proposed by [38] to three-dimensional models (Figs. 2 and 3).

Bottom Line: Giant salamanders perform asymmetrical strikes.These strikes are unusual and specialized behavior but might indeed be beneficial in such sit-and-wait or ambush-predators to capture laterally approaching prey.Given their basal position within extant salamanders and their "conservative" morphology, cryptobranchids may be useful models to reconstruct the feeding ecology and biomechanics of different members of early tetrapods and amphibians, with similar osteological and myological constraints.

View Article: PubMed Central - PubMed

Affiliation: Institut Català de Paleontologia Miquel Crusafont, Sabadell, Spain; Universitat Politècnica de Catalunya-BarcelonaTech, Terrassa, Spain.

ABSTRACT
Biting is an integral feature of the feeding mechanism for aquatic and terrestrial salamanders to capture, fix or immobilize elusive or struggling prey. However, little information is available on how it works and the functional implications of this biting system in amphibians although such approaches might be essential to understand feeding systems performed by early tetrapods. Herein, the skull biomechanics of the Chinese giant salamander, Andrias davidianus is investigated using 3D finite element analysis. The results reveal that the prey contact position is crucial for the structural performance of the skull, which is probably related to the lack of a bony bridge between the posterior end of the maxilla and the anterior quadrato-squamosal region. Giant salamanders perform asymmetrical strikes. These strikes are unusual and specialized behavior but might indeed be beneficial in such sit-and-wait or ambush-predators to capture laterally approaching prey. However, once captured by an asymmetrical strike, large, elusive and struggling prey have to be brought to the anterior jaw region to be subdued by a strong bite. Given their basal position within extant salamanders and their "conservative" morphology, cryptobranchids may be useful models to reconstruct the feeding ecology and biomechanics of different members of early tetrapods and amphibians, with similar osteological and myological constraints.

No MeSH data available.


Related in: MedlinePlus