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A comparative analysis of ontogenetic bite-force scaling among Crocodylia

Erickson, G.M., Gignac, P.M., Lappin, A.K., Vliet, K.A., Brueggen, J.D. and Webb, G.J.W. (2014). A comparative analysis of ontogenetic bite-force scaling among Crocodylia. Journal of Zoology,292:48-55.

Document type: Journal Article
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IRMA ID 82057923xPUB588
Title A comparative analysis of ontogenetic bite-force scaling among Crocodylia
Author Erickson, G.M.
Gignac, P.M.
Lappin, A.K.
Vliet, K.A.
Brueggen, J.D.
Webb, G.J.W.
Journal Name Journal of Zoology
Publication Date 2014
Volume Number 292
ISSN 0952-8369   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-84890801191
Start Page 48
End Page 55
Total Pages 8
Place of Publication United Kingdom
Publisher Wiley-Blackwell Publishing Ltd.
HERDC Category C1 - Journal Article (DIISR)
Abstract Interspecific adult bite forces for all extant crocodylian species are now known. However, how bite forces scale during ontogeny across the clade has yet to be studied. Here we test the hypotheses that extant crocodylians share positively allometric and statistically comparable developmental scaling coefficients for maximal bite-force capacity relative to body size. To do this, we measured bite forces in the Australian freshwater crocodile Crocodylus johnsoni and the Saltwater crocodile C. porosus, and determined how performance changed during ontogeny. We statistically compared these results with those for the American alligator Alligator mississippiensis using 95% prediction intervals and interpreted our findings in a phylogenetic context. We found no observable taxon-specific shifts in the intraspecific scaling of biomechanical performance. Instead, all bite-force values in our crocodylid dataset fell within the bounds of the A. mississippiensis 95% prediction intervals, suggesting similar bite-force capacity when same-sized individuals are compared. This holds true regardless of differences in developmental stage, potential adult body size, rostro-dental form, bone mineralization, cranial suturing, dietary differences or phylogenetic relatedness. These findings suggest that intraspecific bite-force scaling for crocodylians with feeding ecologies comparable with those of extant forms has likely remained evolutionarily static during their diversification.
Keywords Biomechanics
Feeding
Evolution
Allometry
Heterochrony
Crocodylus porosus
Crocodylus johnsoni
Alligator mississippiensis
DOI http://dx.doi.org/10.1111/jzo.12081   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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