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Related Experiment Videos

Maladaptive mate choice maintained by heterozygote advantage.

O Krüger1, J Lindström, W Amos

  • 1Department of Animal Behaviour, University of Bielefeld, Germany. ok212@cam.ac.uk

Evolution; International Journal of Organic Evolution
|July 28, 2001
PubMed
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Common buzzards exhibit plumage color differences, with a maladaptive mating choice favoring similar colors. This behavior, driven by sexual imprinting, persists despite heterozygote advantage maintaining color diversity.

Area of Science:

  • Evolutionary Biology
  • Behavioral Ecology
  • Ornithology

Background:

  • Plumage polymorphism in Common Buzzards (Buteo buteo) is maintained by heterozygote advantage.
  • This polymorphism presents a paradox with observed maladaptive mate choice behaviors.

Purpose of the Study:

  • Investigate the mechanisms maintaining plumage polymorphism in Common Buzzards.
  • Determine the role of mate choice strategies in the persistence of this polymorphism.

Main Methods:

  • Analysis of Common Buzzard (Buteo buteo) plumage polymorphism.
  • Modeling of different mate choice patterns (random mating, own morph preference, mother's morph preference).

Main Results:

  • Light and dark morphs have lower fitness than intermediate morphs.

Related Experiment Videos

  • Buzzards exhibit a preference for mating with individuals of their own color morph.
  • Modeling indicated that preference for the mother's morph best explains observed data.

    • Conclusions:

    • Maladaptive mate choice in Common Buzzards is not based on 'good genes'.
    • Sexual imprinting on the mother's morph is a likely driver of persistent maladaptive mating behavior.
    • Heterozygote advantage coupled with non-genetic mate choice explains the maintenance of plumage polymorphism.