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Related Experiment Videos

The development and evolution of exaggerated morphologies in insects.

D J Emlen1, H F Nijhout

  • 1Division of Biological Sciences, University of Montana, Missoula 59812-1002, USA. demlen@selway.umt.edu

Annual Review of Entomology
|April 13, 2000
PubMed
Summary

This study explores how insect morphology evolves using phenotypic plasticity and reaction norms. It suggests exaggerated traits arise from genetic changes altering body size scaling relationships.

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Area of Science:

  • Evolutionary Biology
  • Developmental Biology
  • Morphometrics

Background:

  • Insect morphology exhibits extreme variations, particularly in sexually selected ornaments and social insect castes.
  • Many exaggerated traits exhibit nonlinear scaling with body size, a phenomenon not fully explained by traditional evolutionary models.

Purpose of the Study:

  • To present a framework for studying insect morphological evolution using phenotypic plasticity and reaction norms.
  • To explain the evolution of exaggerated insect morphologies, especially those with nonlinear body size scaling.

Main Methods:

  • Utilizing the concepts of phenotypic plasticity and reaction norms to analyze morphological evolution.
  • Reviewing existing literature on sexually selected traits, social insect castes, and insect development.

Related Experiment Videos

  • Examining body size scaling relationships in exaggerated insect structures.

    • Main Results:

    • Scaling relationships are proposed as a form of reaction norm, reflecting developmental constraints and evolutionary potential.
    • Genetic changes in the slope or shape of scaling relationships are identified as key drivers for the evolution of exaggerated traits.
    • Two primary evolutionary routes to exaggerated dimensions are proposed: steeper scaling slopes and sigmoid or discontinuous scaling shapes.

    Conclusions:

    • Nonlinear scaling relationships are crucial for understanding the evolution of extreme insect morphologies.
    • The framework provides insights into how developmental processes (scaling) can be modified by evolution to produce exaggerated traits.
    • Further research into insect development can elucidate the mechanisms underlying the evolution of these complex scaling relationships.