Cranial integration in the fire salamander, Salamandra salamandra (Caudata: Salamandridae)

Bon, Margot; Bardua, Carla; Goswami, Anjali; Fabre, Anne‐Claire

doi:10.1093/biolinnean/blaa020

Cited by 14 publications

(32 citation statements)

References 63 publications

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“…Previous work has shown that the strength of integration can facilitate (Navalon et al 2020;Fabre et al 2020;Randau & Goswami 2017a), constrain (Goswami & Polly 2010b;), or have no recoverable effect on morphological diversity (paedomorphic salamanders in Fabre et al 2020;Bardua et al 2019b;Watanabe et al 2019;Bon et al 2020). Here, we find that neither the strength of within-bone integration nor the average strength of each bone's association with another has a significant effect on morphological diversity (Fig.…”

Section: Does the Magnitude Of Morphological Integration Constrain Mocontrasting

confidence: 60%

“…In any case, our developmental modularity hypotheses, which considered the embryonic origins of the articular and quadrate (splanchnocranium) and the rest of the feeding bones (dermatocranium), were not well supported (Supplementary Table 5). While additional patterns of developmental integration potentially contributing to morphological integration in the snake skull are less understood but surely exist, the high amount morphological integration in the kinetic feeding system of snakes is striking when considering the complex patterns of modularity recovered from the synostotic bones that make up akinetic morphological structures in mammals (Goswami 2006;Martín-Serra et al 2018;Adams & Collyer 2019), archosaurs Felice et al 2019), and amphibians (Marshall et al 2019;Bon et al 2020;Fabre et al 2020). In the feeding system of aquatic-foraging snakes, we recognize strong functional and evolutionary integration generated because of its kinesis and developmental disintegration.…”

Section: The Hyperkinetic Feeding System Is Highly Integratedmentioning

confidence: 99%

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Morphological Integration and Modularity in the Hyperkinetic Feeding System of Aquatic-foraging Snakes

Rhoda

Polly

Raxworthy

et al. 2020

Preprint

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The kinetic skull is a key innovation that allowed snakes to capture, manipulate, and swallow prey exclusively using their heads using the coordinated movement of 8 bones. Despite these unique feeding behaviors, patterns of evolutionary integration and modularity within the feeding bones of snakes in a phylogenetic framework have yet to be addressed. Here, we use a dataset of 60 µCT scanned skulls and high-density geometric morphometric methods to address the origin and patterns of variation and integration in the feeding bones of aquatic-foraging snakes. By comparing alternate superimposition protocols allowing us to analyze the entire kinetic feeding system simultaneously, we find that the feeding bones are highly integrated, driven predominantly by functional selective pressures. The most supported pattern of modularity contains four modules each associated with distinct functional roles: the mandible, the palatopterygoid arch, the maxilla, and the suspensorium. Further, the morphological disparity of each bone is not linked to its magnitude of integration, indicating that integration within the feeding system does not constrain morphological evolution and that adequate biomechanical solutions to a wide range of feeding ecologies and behaviors is readily evolvable within the constraint due to integration in the snake feeding system.

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Section: Does the Magnitude Of Morphological Integration Constrain Mocontrasting

confidence: 60%

Section: The Hyperkinetic Feeding System Is Highly Integratedmentioning

confidence: 99%

Morphological Integration and Modularity in the Hyperkinetic Feeding System of Aquatic-foraging Snakes

Rhoda

Polly

Raxworthy

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…2020; Bon et al. 2020). Here, we find that neither the strength of within‐bone integration nor the average strength of each bone's association with another has a significant effect on morphological diversity (Fig.…”

Section: Discussionmentioning

confidence: 99%

Morphological integration and modularity in the hyperkinetic feeding system of aquatic‐foraging snakes

et al. 2020

View full text Add to dashboard Cite

The kinetic skull is a key innovation that allowed snakes to capture, manipulate, and swallow prey exclusively using their heads using the coordinated movement of eight bones. Despite these unique feeding behaviors, patterns of evolutionary integration and modularity within the feeding bones of snakes in a phylogenetic framework have yet to be addressed. Here, we use a dataset of 60 μCT‐scanned skulls and high‐density geometric morphometric methods to address the origin and patterns of variation and integration in the feeding bones of aquatic‐foraging snakes. By comparing alternate superimposition protocols allowing us to analyze the entire kinetic feeding system simultaneously, we find that the feeding bones are highly integrated, driven predominantly by functional selective pressures. The most supported pattern of modularity contains four modules, each associated with distinct functional roles: the mandible, the palatopterygoid arch, the maxilla, and the suspensorium. Further, the morphological disparity of each bone is not linked to its magnitude of integration, indicating that integration within the feeding system does not strongly constrain morphological evolution, and that adequate biomechanical solutions to a wide range of feeding ecologies and behaviors are readily evolvable within the constraint due to integration in the snake feeding system.

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“…2019b) and salamander (Bon et al. 2020; Fabre et al. 2020) crania, despite substantial morphological differences among these clades.…”

Section: Discussionmentioning

confidence: 99%

Evolutionary integration of the frog cranium

et al. 2020

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Evolutionary integration (covariation) of traits has long fascinated biologists because of its potential to elucidate factors that have shaped morphological evolution. Studies of tetrapod crania have identified patterns of evolutionary integration that reflect functional or developmental interactions among traits, but no studies to date have sampled widely across the species‐rich lissamphibian order Anura (frogs). Frogs exhibit a vast range of cranial morphologies, life history strategies, and ecologies. Here, using high‐density morphometrics we capture cranial morphology for 172 anuran species, sampling every extant family. We quantify the pattern of evolutionary modularity in the frog skull and compare patterns in taxa with different life history modes. Evolutionary changes across the anuran cranium are highly modular, with a well‐integrated “suspensorium” involved in feeding. This pattern is strikingly similar to that identified for caecilian and salamander crania, suggesting replication of patterns of evolutionary integration across Lissamphibia. Surprisingly, possession of a feeding larval stage has no notable influence on cranial integration across frogs. However, late‐ossifying bones exhibit higher integration than early‐ossifying bones. Finally, anuran cranial modules show diverse morphological disparities, supporting the hypothesis that modular variation allows mosaic evolution of the cranium, but we find no consistent relationship between degree of within‐module integration and disparity.

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Cranial integration in the fire salamander, Salamandra salamandra (Caudata: Salamandridae)

Cited by 14 publications

References 63 publications

Morphological Integration and Modularity in the Hyperkinetic Feeding System of Aquatic-foraging Snakes

Morphological Integration and Modularity in the Hyperkinetic Feeding System of Aquatic-foraging Snakes

Morphological integration and modularity in the hyperkinetic feeding system of aquatic‐foraging snakes

Evolutionary integration of the frog cranium

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