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Text
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URL Address
<a href="http://doi.org/10.1002/ar.23718" target="_blank" rel="noreferrer noopener">http://doi.org/10.1002/ar.23718</a>
Pages
325–342
Issue
2
Volume
301
Dublin Core
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Title
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Jaw-Muscle Fiber Architecture and Leverage in the Hard-Object Feeding Sooty Mangabey are not Structured to Facilitate Relatively Large Bite Forces Compared to Other Papionins.
Publisher
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Anatomical record (Hoboken, N.J. : 2007)
Date
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2018
2018-02
Subject
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*bite force; *Bite Force; *jaw gape; *jaw-adductor fiber length; *jaw-adductor PCSA; *sooty mangabeys; Adaptation; Animals; Cercocebus atys/*anatomy & histology/physiology; Diet; Female; Jaw/*anatomy & histology/physiology; Macaca/*anatomy & histology/physiology; Male; Masseter Muscle/*anatomy & histology/physiology; Mastication/*physiology; Papio/*anatomy & histology/physiology; Physiological
Creator
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Taylor Andrea B; Terhune Claire E; Toler Maxx; Holmes Megan; Ross Callum F; Vinyard Christopher J
Description
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Numerous studies have sought to link craniofacial morphology with behavioral ecology in primates. Extant hard-object feeders have been of particular interest because of their potential to inform our understanding about the diets of early fossil hominins. Sooty mangabeys (Cercocebus atys) are hard-object feeders that frequently generate what have been described as audibly powerful bites at wide jaw gapes to process materially stiff and hard seeds. We address the hypothesis that sooty mangabeys have features of the masticatory apparatus that facilitate this feeding behavior by comparing fiber architecture and leverage of the masseter and temporalis muscles between sooty mangabeys and three papionin primates that do not specialize on hard objects. Contrary to predictions, sooty mangabeys do not have relatively larger muscle physiologic cross-sectional areas or weights compared to other papionins, nor do they consistently display improved leverage. In this regard, sooty mangabeys differ in their morphology from other hard-object feeders such as tufted capuchins. However, males of all four papionin species converge on a shared pattern of relatively longer anterior superficial masseter fibers compared with female conspecifics, suggesting that males are likely prioritizing muscle stretch to improve gape performance as part of a behavioral repertoire that includes agonistic social interactions and intense male-male competition. These findings strengthen support for the hypothesis that gape display behaviors can exert a strong selective influence throughout the musculoskeletal masticatory apparatus. Results also raise questions about the morphological suitability of extant cercopithecines as models for interpreting feeding behavior and diet in fossil hominins with limited jaw gape capacity. Anat Rec, 301:325-342, 2018. (c) 2018 Wiley Periodicals, Inc.
Identifier
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<a href="http://doi.org/10.1002/ar.23718" target="_blank" rel="noreferrer noopener">10.1002/ar.23718</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).
*bite force
*jaw gape
*jaw-adductor fiber length
*jaw-adductor PCSA
*sooty mangabeys
2018
Adaptation
Anatomical record (Hoboken, N.J. : 2007)
Animals
Cercocebus atys/*anatomy & histology/physiology
Diet
Female
Holmes Megan
Jaw/*anatomy & histology/physiology
Macaca/*anatomy & histology/physiology
Male
Masseter Muscle/*anatomy & histology/physiology
Mastication/*physiology
Papio/*anatomy & histology/physiology
Physiological
Ross Callum F
Taylor Andrea B
Terhune Claire E
Toler Maxx
Vinyard Christopher J