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Multiscale adaptations underlie bite force variation in rodents.

Robert J Brocklehurst1, Nicholas LaFave2, Brandon P Reder2

  • 1Department of Biological Sciences, University of Massachusetts Lowell, Olsen Hall, Lowell, MA, USA. Robert_Brocklehurst@uml.edu.

Communications Biology
|April 17, 2026
PubMed
Summary
This summary is machine-generated.

Organismal bite force adaptations occur across multiple scales in rodent jaw muscles. Studies show that masticatory myosin (MHC-M) expression and muscle structure changes integrate to optimize force production for different diets.

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Area of Science:

  • Evolutionary biology
  • Biomechanics
  • Comparative anatomy

Background:

  • Bite force is a crucial indicator of organismal performance.
  • Masticatory myosin (MHC-M) expression is linked to high bite force.
  • The integration of muscle adaptations across different biological scales remains poorly understood.

Purpose of the Study:

  • To investigate how jaw muscle adaptations for force production are integrated across multiple organizational scales in rodents.
  • To analyze myosin isoform composition, physiological cross-sectional area, and dynamic moment arms in relation to bite force.

Main Methods:

  • Analysis of myosin isoform composition and physiological cross-sectional area of jaw muscles.
  • Ex vivo measurement of dynamic moment arms using X-ray Reconstruction Of Moving Morphology (XROMM).
  • Comparative analysis across six rodent species with varying feeding ecologies.

Main Results:

  • Hard-biting rodents (e.g., grey squirrels) exhibit adaptations at all scales favoring force production.
  • Other species display a mosaic of adaptations, achieving similar bite forces through diverse muscle phenotypes.
  • Guinea pigs show adaptations consistent with reduced incisor bite force.

Conclusions:

  • Craniofacial adaptations for bite force involve coordinated changes across multiple biological scales.
  • Selection for traits like MHC-M expression is integrated across these scales.
  • Understanding these multiscale adaptations provides insights into evolutionary pressures on feeding mechanics.