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Related Experiment Videos

Extreme polymorphism in a Y-linked sexually selected trait.

A K Lindholm1, R Brooks, F Breden

  • 1Behavioural Ecology Research Group, Department of Biological Sciences, Simon Fraser University, Burnaby, BC, Canada. anna.lindholm@unsw.edu.au

Heredity
|January 22, 2004
PubMed
Summary

Male Poecilia parae fish display complex color variations, with Y-chromosome linked traits influencing reproductive success. Female preferences for rare morphs are overridden by other mating strategies, impacting population dynamics.

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Area of Science:

  • Evolutionary Biology
  • Genetics
  • Animal Behavior

Background:

  • Livebearing fish, Poecilia parae, exhibit striking male color polymorphisms.
  • Females of this species are monomorphic, presenting a contrast to male diversity.

Purpose of the Study:

  • To describe male color morphs and size dimorphism in Poecilia parae.
  • To determine the genetic basis and inheritance pattern of male color polymorphism.
  • To investigate the fitness consequences and female mating preferences associated with different male morphs.

Main Methods:

  • Pedigree analysis to establish Y-chromosome linkage of color polymorphism.
  • Field surveys across multiple populations in South America to assess morph abundance.
  • Offspring rearing and dichotomous choice tests to evaluate reproductive success and female preference.

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Main Results:

  • Five distinct male color morphs and associated size dimorphism were identified.
  • The male color polymorphism is genetically linked to the Y-chromosome.
  • While females prefer rare morphs, the common morph exhibits higher reproductive success, suggesting overridden preferences.

Conclusions:

  • The Y-linkage of color polymorphism in Poecilia parae supports theories of sexually antagonistic traits on heterogametic sex chromosomes.
  • Complex interactions including alternative mating strategies and sperm competition likely influence observed morph frequencies and reproductive outcomes.