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Assessing Differences in Sperm Competitive Ability in Drosophila
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Sperm competition accentuates selection on ejaculate attributes.

Pauline Vuarin1,2, Yves Hingrat3, Loïc Lesobre3

  • 11 Emirates Center for Wildlife Propagation , 33250 Missour , Morocco.

Biology Letters
|March 21, 2019
PubMed
Summary

Sperm competition intensifies selection on ejaculate traits. In houbara bustards, ejaculate characteristics faced stronger selection when sperm from multiple males competed, confirming sperm competition as a key evolutionary driver.

Keywords:
ejaculatefertilization successmultiple matingnatural selectionsexual selectionsperm competition

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Area of Science:

  • Reproductive biology
  • Evolutionary biology
  • Animal behavior

Background:

  • Ejaculate attributes influence fertilization success.
  • Female mating with multiple males intensifies sperm competition.
  • Sperm competition is predicted to increase selection on ejaculate traits.

Purpose of the Study:

  • To test if sperm competition accentuates selection on ejaculate attributes.
  • To compare the strength of selection on ejaculate traits under competitive versus non-competitive fertilization.
  • To investigate the role of sperm competition in driving ejaculate evolution in the North African houbara bustard (Chlamydotis undulata undulata).

Main Methods:

  • Comparing selection strength on two ejaculate attributes.
  • Using sperm from single males versus sperm from different males for insemination.
  • Studying the North African houbara bustard (Chlamydotis undulata undulata).

Main Results:

  • Selection on ejaculate attributes was stronger when sperm from different males competed.
  • Demonstrated a direct comparison of selection strength under competitive and non-competitive fertilization.
  • Provided evidence supporting the hypothesis that sperm competition accentuates selection on ejaculate traits.

Conclusions:

  • Sperm competition is a significant selective force shaping ejaculate characteristics.
  • The findings confirm the role of sperm competition in the evolution of ejaculate traits.
  • Highlights the importance of ejaculate attributes in reproductive success and sexual selection.