Asymmetries in Mating Preferences Between Species: Female Swordtails Prefer Heterospecific Males

@article{Ryan1987AsymmetriesIM,
  title={Asymmetries in Mating Preferences Between Species: Female Swordtails Prefer Heterospecific Males},
  author={M. Ryan and W. E. Wagner},
  journal={Science},
  year={1987},
  volume={236},
  pages={595 - 597}
}
In male swordtails (Xiphophorus nigrensis) there are three size classes that derive from allelic variation at the pituitary locus on the Y chromosome. Progeny analysis and preference tests suggest that females prefer to mate with larger males. In the closely related X. pygmaeus, there is no allelic variation at this locus; this species consists of males similar in size only to smaller X. nigrensis males. In addition to being smaller than most X. nigrensis males, these X.pygmaeus males also lack… Expand
235 Citations
A negative correlation between trait and mate preference inXiphophorus pygmaeus
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