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A mechanical model for diversified insect wing margin shapes.

Yukitaka Ishimoto1, Kaoru Sugimura2

  • 1Department of Machine Intelligence and Systems Engineering, Akita Prefectural University, Akita 015-0055, Japan.

Journal of Theoretical Biology
|May 28, 2017
PubMed
Summary
This summary is machine-generated.

Insect wing shapes are diverse, but margin shape origins are unclear. A new mechanical model reveals that varying bending stiffness in the wing margin can create diverse insect wing shapes.

Keywords:
InsectMechanicsMorphogenesisWing

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Area of Science:

  • Developmental Biology
  • Biophysics
  • Insect Morphology

Background:

  • Insect wings exhibit significant morphological diversity in size, shape, venation, and pigmentation.
  • The genetic basis of Drosophila wing development is well-understood, yet the drivers of wing margin shape diversity remain elusive.
  • Smoothly curved wing margins, common in insects, suggest a complex, organized multicellular mechanical structure.

Purpose of the Study:

  • To develop a mechanical model explaining the diversity of insect wing margin shapes.
  • To investigate the role of non-uniform bending stiffness in wing margin morphology.
  • To explore the influence of intrinsic tension on wing margin shape and stiffness.

Main Methods:

  • Development of a mechanical model incorporating non-uniform bending stiffness of the wing margin.
  • Inference of bending stiffness distribution from experimental insect wing images.
  • Analysis of the effect of intrinsic wing blade tension on margin shape.
  • Integration of wing margin mechanics into a cell vertex model of wing blade development.

Main Results:

  • The model demonstrated that varied spatial distributions of bending stiffness can accurately reproduce diverse wing margin shapes.
  • Analysis of experimental images revealed a consistent spatial profile of bending stiffness across different insect species.
  • Intrinsic tension was found to influence both wing margin shape and the inferred bending stiffness.
  • The hybrid cell vertex model, incorporating wing margin stiffness, successfully retained key features of the margin model.

Conclusions:

  • The spatial profile of bending stiffness in the insect wing margin is a critical factor in determining wing shape.
  • This mechanical property, alongside morphogenetic processes within the wing blade, plays a pivotal role in insect wing evolution and diversity.
  • The findings provide a new framework for understanding the biomechanical basis of morphological variation in insect wings.