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Trade-offs in jaw mechanics accelerate evolution in cichlid fish. Force-based jaws evolved faster than velocity-based jaws, driving significant adaptive radiation and ecological diversity.

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Area of Science:

  • Evolutionary Biology
  • Comparative Biomechanics
  • Macroevolutionary Studies

Background:

  • Evolutionary trade-offs are fundamental to anatomical systems, influencing morphological, functional, and ecological diversity.
  • Jaw biomechanics, particularly the velocity-force trade-off (mechanical advantage), is a critical area for studying evolutionary constraints and diversification.

Purpose of the Study:

  • To investigate the impact of the velocity-force trade-off on the rates of jaw evolution in Neotropical cichlids.
  • To determine how specialization at different extremes of the velocity-force continuum affects macroevolutionary outcomes.

Main Methods:

  • Comparative analysis of jaw morphology and feeding ecologies across 130 Neotropical cichlid species.
  • Quantification of evolutionary rates associated with different functional specializations along the velocity-force trade-off spectrum.

Main Results:

  • The velocity-force trade-off significantly impacts jaw system evolution, with faster rates observed at functional extremes compared to intermediate jaws.
  • Force-modified jaws exhibited 7- to 18-fold faster evolution than unspecialized jaws, while velocity-modified jaws showed 4- to 10-fold increases.
  • More extreme trade-offs correlated with accelerated jaw evolution, with distinct patterns of ecological lability and stasis at each extreme.

Conclusions:

  • The velocity-force trade-off drives rapid phenotypic evolution in cichlid jaws, contributing to adaptive radiation.
  • Asymmetrical macroevolutionary outcomes arise from the velocity-force trade-off, potentially influenced by the pharyngeal jaw system.
  • Findings on jaw evolution and trade-offs have broad applicability across vertebrates due to the universal nature of jaw mechanics.