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Development vs. behavior: a role for neural adaptation in evolution?

Alain Ghysen1, Christine Dambly-Chaudière

  • 1Inserm, U1198, Montpellier, France; Université de Montpellier, Montpellier, France and EPHE, Paris, France.

The International Journal of Developmental Biology
|July 9, 2016
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Summary
This summary is machine-generated.

The evolution of fish lateral line system patterns is driven by developmental processes, not selection. Adaptation occurs as nervous systems adjust to new morphologies, as seen in Mexican tetra behavioral differences.

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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Neuroscience

Background:

  • The lateral line system in fish is crucial for detecting water movement.
  • Understanding its evolutionary patterns requires integrating developmental and comparative approaches.
  • Zebrafish and tuna offer valuable models for studying lateral line development and evolution.

Purpose of the Study:

  • To investigate the evolutionary drivers of sensory organ patterning in the fish lateral line system.
  • To differentiate the roles of developmental processes versus selective pressures in shaping these patterns.
  • To propose a novel framework for understanding adaptation in relation to developmental morphology.

Main Methods:

  • Comparative analysis of lateral line development in zebrafish and tuna.
  • Examination of developmental processes underlying sensory organ patterning.
  • Analysis of behavioral data from cave and surface forms of Astyanax fasciatus.

Main Results:

  • Lateral line pattern evolution is primarily shaped by variations in developmental processes, independent of direct selective pressure.
  • Major developmental innovations appear linked to their exploitation, suggesting a role for selection.
  • The nervous system's ability to adapt to new morphologies is proposed as the primary locus of adaptation.

Conclusions:

  • Species adapt by neural adjustments to morphologies generated by their developmental programs.
  • The Mexican tetra (Astyanax fasciatus) provides a model system to study adaptation and selection.
  • This research reframes the understanding of adaptation as a neural process responding to developmental variation.