Scaling and accommodation of jaw adductor muscles in Canidae.

Penrose, F, Kemp, GJ and Jeffery, N (2016) Scaling and accommodation of jaw adductor muscles in Canidae. Anat Rec (Hoboken). ISSN 1932-8494

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Abstract

The masticatory apparatus amongst closely related Carnivoran species raises intriguing questions about the interplay between allometry, function and phylogeny in defining interspecific variations of cranial morphology. Here we describe the gross structure of the jaw adductor muscles of several species of canid, and then examine how the muscles are scaled across the range of body sizes, phylogenies and trophic groups. We also consider how the muscles are accommodated on the skull, and how this is influenced by differences of endocranial size. Data were collected for a suite of morphological metrics, including body mass, endocranial volume and muscle masses and we used geometric morphometric shape analysis to reveal associated form changes. We find that all jaw adductor muscles scale isometrically against body mass, regardless of phylogeny or trophic group, but that endocranial volume scales with negative allometry against body mass. These findings suggest that head shape is partly influenced by the need to house isometrically scaling muscles on a neurocranium scaling with negative allometry. Principal component analysis suggests that skull shape changes, such as the relatively wide zygomatic arches and large sagittal crests seen in species with higher body masses, allow the skull to accommodate a relative enlargement of the jaw adductors compared with the endocranium. This article is protected by copyright. All rights reserved.

Item Type:	Article
Uncontrolled Keywords:	accommodation, canid, hypercarnivorous, jaw adductor, muscle, scaling
Depositing User:	Symplectic Admin
Date Deposited:	09 May 2016 09:42
Last Modified:	19 Jan 2023 07:37
DOI:	10.1002/ar.23355
Related URLs:	http://www.ncbi.nlm.nih.gov/pubmed/27103...
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3001149