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Inheritance patterns of plumage coloration in common buzzards Buteo buteo do not support a one-locus two-allele model

Kappers, E. F., de Vries, C., Alberda, A., Forstmeier, W., Both, C. & Kempenaers, B., Apr-2018, In : Biology Letters. 14, 4, 4 p., 20180007.

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Balancing selection is a major mechanism to maintain colour polymorphisms over evolutionary time. In common buzzards, variation in plumage colour was reportedly maintained by a heterozygote advantage: heterozygote intermediates had higher fitness than homozygote light and dark morphs. Here, we challenge one of the basic premises of the heterozygote advantage hypothesis, by testing whether plumage colour variation in common buzzards follows a one-locus two-allele inheritance model. Using a long-term population study with 202 families, we show that colour variation in buzzards is highly heritable. However, we find no support for a simple Mendelian one-locus two-allele model of inheritance. Our results rather suggest that buzzard plumage colour should be considered a quantitative polygenic trait. As a consequence, it is unlikely that the proposed heterozygote advantage is the mechanism that maintains this genetic variation. We hypothesize that plumage colour effects on fitness might depend on the environment, but this remains to be tested.
Original languageEnglish
Article number20180007
Number of pages4
JournalBiology Letters
Volume14
Issue number4
Publication statusPublished - Apr-2018

    Keywords

  • EXTRA-PAIR PATERNITY, SWAINSONS HAWKS, TEMPORAL STABILITY, R PACKAGE, BARN OWL, POLYMORPHISM, CLASSIFICATION, MAINTENANCE, POPULATIONS, SELECTION

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