Strategic ejaculation in simultaneously hermaphroditic land snails: More sperm into virgin mates

Kazuki Kimura, Satoshi Chiba

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Background: It has been theorised that sperm competition promotes the strategic usage of costly sperm. Although sperm competition is thought to be an important driving force of reproductive traits in simultaneous hermaphrodites as well as in species with separate sexes, empirical studies on strategic ejaculation in simultaneous hermaphrodites are scarce. Results: In the present study, we tested whether the simultaneously hermaphroditic land snail Euhadra quaesita adjusts the number of sperm donated according to the condition of the mate and whether the pattern of strategic ejaculation is in line with previously suggested theories. We found that individuals donated much more sperm when they copulated with a virgin mate than when they copulated with a non-virgin. Conclusion: The virgin-biased pattern of ejaculation matches the theoretical prediction and suggests that sperm competition significantly influence the reproductive traits of simultaneously hermaphroditic land snails.

Original languageEnglish
Article number264
JournalBMC Evolutionary Biology
Issue number1
Publication statusPublished - 2013 Dec 5


  • Land snails
  • Simultaneous hermaphrodites
  • Sperm allocation
  • Sperm competition
  • Strategic ejaculation

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics


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