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Journal of Mammalian Evolution

, Volume 23, Issue 4, pp 369–383 | Cite as

Morphology is not Destiny: Discrepancy between Form, Function and Dietary Adaptation in Bovid Cheek Teeth

  • Juan Pablo Gailer
  • Ivan Calandra
  • Ellen Schulz-Kornas
  • Thomas M. Kaiser
Original Paper

Abstract

Mammal teeth have evolved morphologies that allow for the efficient mechanical processing of different foods, therefore increasing dietary energy uptake for maintenance of high metabolic demands. However, individuals masticate foods with biomechanical properties at odds with the optimal function of a given tooth morphology. Here, we investigate tooth form and function using two quantitative 3D methods at different scales on the same individuals of nine bovid species. Dental topometry quantifies the gross morphology, and therefore, reflects evolutionary adaptive patterns. Surface texture analysis infers mechanical occlusal events, which reflect the actual tooth function, and is free from the influence of morphology. We found that tough foods can be satisfactorily exploited by grazing species with enamel ridge morphologies not more complex than those found in intermediate feeders and browsers. Thus, the evolution of enamel complexity is likely determined by a balance between adaptation and constraints. Wider enamel ridges seem to be a common functional trait in bovids to compensate for severe wear from abrasive foods and/or chipping from hard foods. Our results demonstrate that supposedly essential functional adaptations in tooth morphology may not be required to process food efficiently. This emphasizes the large plasticity between “optimal” morphology and the potential function of the tooth, and underscores the need to appreciate (apparently) maladaptive structures in mammalian evolution as nevertheless effective functioning units.

Keywords

3D dental topometry Bovidae Dental evolution Feeding adaptation Surface texture analysis 

Notes

Acknowledgments

The authors thank all curators and technical assistants in the collections visited for this research for access to the specimens and permission to take moulds in their facilities. We are grateful to Gina Semprebon for the kind help of correcting the English of this manuscript. This research was sponsored by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation, KA 1525/8-1) and is publication no. 83 of the DFG Research Unit 771 “Function and performance enhancement in the mammalian dentition – phylogenetic and ontogenetic impact on the masticatory apparatus.”

Supplementary material

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Juan Pablo Gailer
    • 1
  • Ivan Calandra
    • 2
  • Ellen Schulz-Kornas
    • 1
    • 3
  • Thomas M. Kaiser
    • 1
  1. 1.Center of Natural HistoryUniversity of HamburgHamburgGermany
  2. 2.GEGENAA – EA 3795University of Reims Champagne-ArdenneReimsFrance
  3. 3.Max Planck Institute for Evolutionary Anthropology, Max Planck Weizmann Center for Integrative Archaeology and AnthropologyLeipzigGermany

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