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  Dental microwear texture gradients in guinea pigs reveal that material properties of the diet affect chewing behaviour

Winkler, D. E., Clauss, M., Rölle, M., Schulz-Kornas, E., Codron, D., Kaiser, T. M., et al. (2021). Dental microwear texture gradients in guinea pigs reveal that material properties of the diet affect chewing behaviour. Journal of Experimental Biology, 224(13): jeb242446, pp. 1-11. doi:10.1242/jeb.242446.

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 Creators:
Winkler, Daniela E., Author
Clauss, Marcus, Author
Rölle, Maximilian, Author
Schulz-Kornas, Ellen1, Author                 
Codron, Daryl, Author
Kaiser, Thomas M., Author
Tütken, Thomas, Author
Affiliations:
1Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Max Planck Society, ou_1497673              

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Free keywords: Mastication; Bite force; Tooth wear; Abrasion
 Abstract: Dental microwear texture analysis (DMTA) is widely used for dietinferences in extant and extinct vertebrates. Often, a reference toothposition is analysed in extant specimens, while isolated teeth arelumped together in fossil datasets. It is therefore important to testwhether dentalmicrowear texture (DMT) istooth position specificand,ifso, what causes the differences in wear. Here, we present results fromcontrolled feeding experiments with 72 guinea pigs, which receivedeither fresh or dried natural plant diets of different phytolith content(lucerne, grass, bamboo) or pelleted diets with and without mineralabrasives (frequently encountered by herbivorous mammals in naturalhabitats). We tested for gradients in dental microwear texture along theupper cheek tooth row. Regardless of abrasive content, guinea pigs onpelleted diets displayed an increase in surface roughness along thetooth row, indicating that posterior tooth positions experience morewear compared with anterior teeth. Guinea pigs feedings on plants oflow phytolith content and low abrasiveness (fresh and dry lucerne,fresh grass) showed almost no DMT differences between toothpositions, while individuals feeding on more abrasive plants (drygrass, fresh and dry bamboo) showed a gradient of decreasing surfaceroughness along the tooth row. We suggest that plant feeding involvescontinuous intake and comminution by grinding, resulting in posteriortooth positions mainly processing food already partly comminuted andmoistened. Pelleted diets require crushing, which exerts higher loads,especially on posterior tooth positions, where bite forces are highest.These differences in chewing behaviour result in opposing weargradients for plant versus pelleted diets.

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Language(s): eng - English
 Dates: 2021-07-122021-07-12
 Publication Status: Issued
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1242/jeb.242446
 Degree: -

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Title: Journal of Experimental Biology
Source Genre: Journal
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Affiliations:
Publ. Info: Company of Biologists
Pages: - Volume / Issue: 224 (13) Sequence Number: jeb242446 Start / End Page: 1 - 11 Identifier: ISSN: 0022-0949
ISSN: 1477-9145