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Proximate determinants of bite force in Anolis lizards

(2016) JOURNAL OF ANATOMY. 228(1). p.85-95
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Abstract
Performance measures associated with the vertebrate jaw system may provide important insights into vertebrate ecology and evolution because of their importance in many ecologically relevant tasks. Previous studies have shown that in many taxa, evolution toward higher bite force has gone hand in hand with the evolution of larger body size. However, independent of differences in overall body size, bite force may vary depending on head size and shape as well. Moreover, the underlying musculature may also drive variation in bite force. Here, we investigate the proximate determinants of bite force in lizards of the genus Anolis. We dissected the jaw muscles and quantified muscle mass, fibre length, and cross-sectional area. Data were analysed for both sexes independently given the sexual dimorphism detected in the dataset. Our results show that the traits that explain bite force are similar in both males and females with overall body size and muscle mass being the principal determinants. Among the different muscles examined, the adductor externus and the pseudotemporalis groups were the best determinants of bite force. However, models run for males predicted the variation in bite force better than models for females, suggesting that selection on morphology improving bite force may be stronger in males.
Keywords
head shape, muscle, biting, sexual dimorphism, HEAD SHAPE EVOLUTION, SEXUAL-DIMORPHISM, DIVERGENCE HYPOTHESIS, GALLOTIA-GALLOTI, LACERTID LIZARDS, MATING SUCCESS, CRANIAL DESIGN, DEWLAP SIZE, HABITAT USE, BODY-SIZE

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Citation

Please use this url to cite or link to this publication:

Chicago
Wittorski, Antoine, Jonathan B Losos, and Anthony Herrel. 2016. “Proximate Determinants of Bite Force in Anolis Lizards.” Journal of Anatomy 228 (1): 85–95.
APA
Wittorski, A., Losos, J. B., & Herrel, A. (2016). Proximate determinants of bite force in Anolis lizards. JOURNAL OF ANATOMY, 228(1), 85–95.
Vancouver
1.
Wittorski A, Losos JB, Herrel A. Proximate determinants of bite force in Anolis lizards. JOURNAL OF ANATOMY. 2016;228(1):85–95.
MLA
Wittorski, Antoine, Jonathan B Losos, and Anthony Herrel. “Proximate Determinants of Bite Force in Anolis Lizards.” JOURNAL OF ANATOMY 228.1 (2016): 85–95. Print.
@article{7165009,
  abstract     = {Performance measures associated with the vertebrate jaw system may provide important insights into vertebrate ecology and evolution because of their importance in many ecologically relevant tasks. Previous studies have shown that in many taxa, evolution toward higher bite force has gone hand in hand with the evolution of larger body size. However, independent of differences in overall body size, bite force may vary depending on head size and shape as well. Moreover, the underlying musculature may also drive variation in bite force. Here, we investigate the proximate determinants of bite force in lizards of the genus Anolis. We dissected the jaw muscles and quantified muscle mass, fibre length, and cross-sectional area. Data were analysed for both sexes independently given the sexual dimorphism detected in the dataset. Our results show that the traits that explain bite force are similar in both males and females with overall body size and muscle mass being the principal determinants. Among the different muscles examined, the adductor externus and the pseudotemporalis groups were the best determinants of bite force. However, models run for males predicted the variation in bite force better than models for females, suggesting that selection on morphology improving bite force may be stronger in males.},
  author       = {Wittorski, Antoine and Losos, Jonathan B and Herrel, Anthony},
  issn         = {0021-8782},
  journal      = {JOURNAL OF ANATOMY},
  language     = {eng},
  number       = {1},
  pages        = {85--95},
  title        = {Proximate determinants of bite force in Anolis lizards},
  url          = {http://dx.doi.org/10.1111/joa.12394},
  volume       = {228},
  year         = {2016},
}

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