Coexistence of a sexual and an unisexual form stabilized by parasites.

@article{Hakoyama2004CoexistenceOA,
  title={Coexistence of a sexual and an unisexual form stabilized by parasites.},
  author={Hiroshi Hakoyama and Yoh Iwasa},
  journal={Journal of theoretical biology},
  year={2004},
  volume={226 2},
  pages={
          185-94
        }
}
An unisexual species (either parthenogenetic or gynogenetic form) often coexists sympatrically with a closely related anisogamous sexual species, forming a unisexual complex. This is puzzling because, all else being equal, a sexual population with the two-fold cost of sex (or the cost of producing males) cannot coexist with a unisexual population. This suggests that some ecological processes are at work to make possible the coexistence of the unisexual complex. Field and laboratory studies… CONTINUE READING
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