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Related Experiment Videos

Why Sexually Selected Weapons Are Not Ornaments.

Erin L McCullough1, Christine W Miller2, Douglas J Emlen3

  • 1Centre for Evolutionary Biology, The University of Western Australia, Crawley, WA 6009, Australia.

Trends in Ecology & Evolution
|August 1, 2016
PubMed
Summary

Sexual selection research often conflates weapons with ornaments. This study clarifies the distinct roles of male-male competition and female choice in trait evolution, advocating for biomechanical approaches to understand weapon design.

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Area of Science:

  • Evolutionary Biology
  • Animal Behavior

Background:

  • Sexual selection research has historically conflated sexually selected weapons with ornaments.
  • Understanding the evolution and diversification of weapons is crucial but remains poorly understood.

Purpose of the Study:

  • To differentiate between male-male competition and female choice as distinct sexual selection mechanisms.
  • To highlight the fundamental differences between weapons and ornaments as distinct trait types.
  • To propose future research directions for understanding weapon evolution and speciation.

Main Methods:

  • Conceptual analysis differentiating male-male competition and female choice.
  • Distinguishing weapons from ornaments based on their function in sexual selection.
  • Review of existing literature on sexual selection and trait evolution.
Keywords:
biomechanicsdiversitymale-male competitionsexual selectionweapons

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Main Results:

  • Weapons and ornaments are fundamentally different types of traits.
  • Male-male competition and female choice are distinct mechanisms driving sexual selection.
  • Conflation of weapons and ornaments has hindered progress in understanding weapon evolution.

Conclusions:

  • Future research should focus on factors driving weapon divergence and the role of male-male competition in speciation.
  • Biomechanical approaches offer a promising avenue for understanding the design and evolution of fighting structures (weapons).
  • Clarifying the distinct roles of weapons and ornaments is essential for advancing sexual selection theory.