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Related Experiment Video

Updated: Apr 21, 2026

Using the FishSim Animation Toolchain to Investigate Fish Behavior: A Case Study on Mate-Choice Copying In Sailfin Mollies
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Postcopulatory inbreeding avoidance in guppies.

J L Fitzpatrick1, J P Evans

  • 1Computational and Evolutionary Biology, Faculty of Life Sciences, University of Manchester, Manchester, UK; Centre for Evolutionary Biology, School of Animal Biology, University of Western Australia, Crawley, WA, Australia.

Journal of Evolutionary Biology
|November 13, 2014
PubMed
Summary
This summary is machine-generated.

In guppies, sperm competition can favor unrelated males, preventing inbreeding. This postcopulatory inbreeding avoidance is strongest when related males are full siblings.

Keywords:
cryptic female choicegenetic compatibilityrelatednesssexual selectionsperm competition

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Area of Science:

  • Evolutionary biology
  • Behavioral ecology
  • Reproductive biology

Background:

  • Inbreeding depression negatively impacts fitness across species.
  • Pre-mating inbreeding avoidance mechanisms are well-studied.
  • Postcopulatory inbreeding avoidance mechanisms are less understood.

Purpose of the Study:

  • To investigate postcopulatory inbreeding avoidance in guppies (Poecilia reticulata).
  • To determine if paternity biases favor unrelated males during sperm competition.
  • To assess the role of sperm quality in postcopulatory mate choice.

Main Methods:

  • Artificial insemination with equal sperm numbers from related and unrelated males.
  • Controlled experiments to isolate postcopulatory mechanisms.
  • Statistical control for sperm quality differences between rival ejaculates.

Main Results:

  • A significant paternity bias favoring unrelated males was observed.
  • This bias was only apparent when the related male was a full sibling.
  • Sperm viability influences sperm competition success, with higher viability favoring males.

Conclusions:

  • Postcopulatory inbreeding avoidance mechanisms can evolve.
  • Sperm competition in guppies declines with increasing relatedness, particularly for full siblings.
  • These findings highlight the role of postcopulatory processes in preventing inbreeding.