Extreme and rapid bursts of functional adaptations shape bite force in amniotes

Sakamoto, Manabu and Ruta, Marcello and Venditti, Chris (2019) Extreme and rapid bursts of functional adaptations shape bite force in amniotes. Proceedings of the Royal Society B: Biological Sciences, 286 . ISSN 0962-8452

Full content URL: https://doi.org/10.1098/rspb.2018.1932

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Extreme and rapid bursts of functional adaptations shape bite force in amniotes
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Abstract

Adaptation is the fundamental driver of functional and biomechanical evolution. Accordingly, the states of biomechanical traits (absolute or relative trait values) have long been used as proxies of adaptations in response to direct selection. However, ignoring evolutionary history, in particular ancestry, passage of time and the rate of evolution, can be misleading. Here, we apply a recently developed phylogenetic statistical approach using significant rate shifts to detect instances of exceptional rates of adaptive changes in bite force, in a large group of terrestrial vertebrates, the amniotes. Our results show that bite force in amniotes evolved through multiple bursts of exceptional rates of adaptive changes, whereby whole groups – including Darwin’s finches, maniraptoran dinosaurs (group of non-avian dinosaurs including birds), anthropoids and hominins (the group of species including modern humans) – experienced significant rate increases compared to the background rate. However, in most parts of the amniote tree of life we find no exceptional rate increases, indicating that coevolution with body size was primarily responsible for the patterns observed in bite force. Our approach represents a template for future studies in functional morphology and biomechanics, where exceptional rates of adaptative changes can be quantified and potentially linked to specific ecological factors underpinning major evolutionary radiations.

Additional Information:Article ID:20181932
Keywords:bite force, evolution, phylogenetic comparative methods, adaptations, amniotes, rate shifts
Subjects:C Biological Sciences > C300 Zoology
C Biological Sciences > C182 Evolution
F Physical Sciences > F641 Palaeontology
C Biological Sciences > C100 Biology
Divisions:College of Science > School of Life Sciences
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ID Code:34662
Deposited On:05 Feb 2019 10:12

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