Coexistence of a sexual and an unisexual form stabilized by parasites

Hiroshi Hakoyama, Yoh Iwasa

研究成果: ジャーナルへの寄稿学術誌査読

11 被引用数 (Scopus)


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 suggest that parasitism in a gynogenetic complex of the Japanese crucian carp (Carassius auratus) may play an important role in realizing the coexistence by giving frequency-dependent benefit to sexual population. Here, we study the simple dynamics of host-parasite interactions in which non-specific immune reaction of a sexual host is more effective than that of an unisexual host. We simply assume that the infective individuals are sterile. Stable coexistence of a unisexual species with their sexual relative is possible if pathogens are virulent and if the susceptibility of the unisexual form is more than twice as high as that of the sexual form. The coexistence is more difficult, when the fertility of males is relatively low in gynogenetic complexes. This implies that the coexistence of gynogenetic complexes is more difficult than that of parthenogenetic complexes in which parthenogenesis has no constraint on males. We conclude that parasitism is a promising candidate mechanism for the coexistence of unisexual complexes.

ジャーナルJournal of Theoretical Biology
出版ステータス出版済み - 1月 21 2004

!!!All Science Journal Classification (ASJC) codes

  • 統計学および確率
  • モデリングとシミュレーション
  • 生化学、遺伝学、分子生物学(全般)
  • 免疫学および微生物学(全般)
  • 農業および生物科学(全般)
  • 応用数学


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