Chewed out: an experimental link between food material properties and repetitive loading of the masticatory apparatus in mammals

Using a model organism (rabbits) that resembles a number of mammalian herbivores in key aspects of its chewing behaviors, we examined how variation in dietary mechanical properties affects food breakdown during mastication. Such data have implications for understanding phenotypic variation in the ma...

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Bibliographic Details
Published in:PeerJ (San Francisco, CA) CA), 2015-11, Vol.3, p.e1345-e1345, Article e1345
Main Authors: Ravosa, Matthew J, Scott, Jeremiah E, McAbee, Kevin R, Veit, Anna J, Fling, Annika L
Format: Article
Language:English
Subjects:
Anatomy and Physiology
Animal behavior
Anthropology
Chewing
Cyclical/repetitive loading
Diet
Evolution
Evolutionary Studies
Feeding apparatus
Food
Food mechanical properties
Herbivores
Jaw
Jaw loading patterns
Mammalia
Mammals
Mastication
Masticatory system
Mechanical properties
Monkeys & apes
Morphology
Muscle function
Oryctolagus cuniculus
Paleontology
Phenotypic variations
Zoology
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Summary:Using a model organism (rabbits) that resembles a number of mammalian herbivores in key aspects of its chewing behaviors, we examined how variation in dietary mechanical properties affects food breakdown during mastication. Such data have implications for understanding phenotypic variation in the mammalian feeding apparatus, particularly with respect to linking jaw form to diet-induced repetitive loading. Results indicate that chewing frequency (chews/s) is independent of food properties, whereas chewing investment (chews/g) and chewing duration(s), which are proportional to repetitive loading of the jaws, are positively related to food stiffness and toughness. In comparisons of displacement-limited and stress-limited fragmentation indices, which respectively characterize the intraoral breakdown of tough and stiff foods, increases in chewing investment and duration are linked solely to stiffness. This suggests that stiffer foods engender higher peak loads and increased cyclical loading. Our findings challenge conventional wisdom by demonstrating that toughness does not, by itself, underlie increases in cyclical loading and loading duration. Instead, tough foods may be associated with such jaw-loading patterns because they must be processed in greater volumes owing to their lower nutritive quality and for longer periods of time to increase oral exposure to salivary chemicals.
ISSN:2167-8359
2167-8359
DOI:10.7717/peerj.1345