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Text
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URL Address
<a href="http://doi.org/10.1093/icb/icr066" target="_blank" rel="noreferrer noopener">http://doi.org/10.1093/icb/icr066</a>
Pages
260–270
Issue
2
Volume
51
Dublin Core
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Title
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A preliminary analysis of correlations between chewing motor patterns and mandibular morphology across mammals.
Publisher
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Integrative and comparative biology
Date
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2011
2011-08
Subject
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*Mastication; Animals; Biological Evolution; Bite Force; Electromyography; Feeding Behavior/physiology; Jaw/anatomy & histology/*physiology; Mammals/anatomy & histology/physiology; Masseter Muscle/anatomy & histology/*physiology; Phylogeny; Temporal Muscle/anatomy & histology/*physiology
Creator
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Vinyard Christopher J; Williams Susan H; Wall Christine E; Doherty Alison H; Crompton Alfred W; Hylander William L
Description
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The establishment of a publicly-accessible repository of physiological data on feeding in mammals, the Feeding Experiments End-user Database (FEED), along with improvements in reconstruction of mammalian phylogeny, significantly improves our ability to address long-standing questions about the evolution of mammalian feeding. In this study, we use comparative phylogenetic methods to examine correlations between jaw robusticity and both the relative recruitment and the relative time of peak activity for the superficial masseter, deep masseter, and temporalis muscles across 19 mammalian species from six orders. We find little evidence for a relationship between jaw robusticity and electromyographic (EMG) activity for either the superficial masseter or temporalis muscles across mammals. We hypothesize that future analyses may identify significant associations between these physiological and morphological variables within subgroups of mammals that share similar diets, feeding behaviors, and/or phylogenetic histories. Alternatively, the relative peak recruitment and timing of the balancing-side (i.e., non-chewing-side) deep masseter muscle (BDM) is significantly negatively correlated with the relative area of the mandibular symphysis across our mammalian sample. This relationship exists despite BDM activity being associated with different loading regimes in the symphyses of primates compared to ungulates, suggesting a basic association between magnitude of symphyseal loads and symphyseal area among these mammals. Because our sample primarily represents mammals that use significant transverse movements during chewing, future research should address whether the correlations between BDM activity and symphyseal morphology characterize all mammals or should be restricted to this "transverse chewing" group. Finally, the significant correlations observed in this study suggest that physiological parameters are an integrated and evolving component of feeding across mammals.
Identifier
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<a href="http://doi.org/10.1093/icb/icr066" target="_blank" rel="noreferrer noopener">10.1093/icb/icr066</a>
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Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
*Mastication
2011
Animals
Biological Evolution
Bite Force
Crompton Alfred W
Doherty Alison H
Electromyography
Feeding Behavior/physiology
Hylander William L
Integrative and comparative biology
Jaw/anatomy & histology/*physiology
Mammals/anatomy & histology/physiology
Masseter Muscle/anatomy & histology/*physiology
Phylogeny
Temporal Muscle/anatomy & histology/*physiology
Vinyard Christopher J
Wall Christine E
Williams Susan H