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Direct observation of sexual competition inDrosophila melanogaster: The mutantWhite in competition with other genotypes

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Abstract

When two types ofDrosophila are in competition, the frequency dependence of mating success routinely is measured in our laboratory by direct observation of mating pairs in “Elens-Wattiaux” observation chambers. The present experiments concern white mutants (used here as a reference standard) in competition with three other genotypes: wild-type Canton S, “giant”gt w a, and “giant”gt 13z/w + Y/C(1)Dx, y f. From the present observations, the frequency dependence of mating success seems a very common phenomenon: a rare-type sexual advantage exists for females and for males. Sexual activity of male and femalewhite mutants is significantly higher when food is present in the mating chamber. Males of the other strains also are more active in the presence of food. Homogamic matings are more frequent amonggt 13z/w + Y/C(1)Dx, y f flies.

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Depiereux, E., Dernoncourt-Sterpin, C., Lechien, J. et al. Direct observation of sexual competition inDrosophila melanogaster: The mutantWhite in competition with other genotypes. Behav Genet 20, 511–533 (1990). https://doi.org/10.1007/BF01067717

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Key Words

  • Drosophilia
  • sexual competition