Abstract
Amphibians are different from most other tetrapods because they have a biphasic life cycle, with larval forms showing a dramatically different cranial anatomy and feeding strategy compared to adults. Amphibians with their exceptional diversity in habitats, lifestyles and reproductive modes are also excellent models for studying the evolutionary divergence in feeding systems. In the present chapter, we review the literature on amphibian feeding anatomy and function published since 2000. We also present some novel unpublished data on caecilian feeding biomechanics. This review shows that over the past two decades important new insights in our understanding of amphibian feeding anatomy and function have been made possible, thanks to a better understanding of the phylogenetic relationships between taxa, analyses of development and the use of biomechanical modelling. In terms of functional analyses, important advances involve the temperature-dependent nature of tongue projection mechanisms and the plasticity exhibited by animals when switching environments (land to water) during their lifetime. Understanding the relationships between cranial and hyobranchial diversity and feeding function, and how these relationships are dependent on lifestyle, habitat use or reproductive mode are questions that remain to be answered. Given the availability of massive online databases with µCT data and robust comprehensive phylogenies, these analyses are becoming possible. Unfortunately, quantitative studies on muscular anatomy, essential to link variation in form to variation in function using modelling approaches, have lagged behind. Future studies quantifying feeding across a wide range of species will provide critical insights into the selective pressures underlying the evolution of the staggering diversity in feeding form and function of amphibians.
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Acknowledgements
The authors would like to thank Dr. Sam Van Wassenbergh for providing feedback on this chapter; Dr. Steve Deban for allowing us to use a video of a bufonid capturing prey using in Fig. 12.6. Jim O’Reilly specifically would like to acknowledge Robert Levine and Skip Bennett for allowing him to include data on the function of the interhyoideus posterior muscle in caecilians in this chapter. He also would like to thank Beth Brainerd, Nate Kley, George Drake, Steve Deban and Eric Silva for help during the acquisition of these data. RB would like to thank Christian Nemoz, Alberto Bravin, Paul Tafforeau, Elodie Boller and Gheylen Daghfous for help with imaging at the ESRF. Finally, we would like to thank Dr. D. Blackburn for providing us with the frog scans, most of which are available on Morphosource (https://www.morphosource.org/).
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Herrel, A. et al. (2019). Feeding in Amphibians: Evolutionary Transformations and Phenotypic Diversity as Drivers of Feeding System Diversity. In: Bels, V., Whishaw, I. (eds) Feeding in Vertebrates. Fascinating Life Sciences. Springer, Cham. https://doi.org/10.1007/978-3-030-13739-7_12
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