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Related Experiment Videos

Population models of sperm-dependent parthenogenesis.

David Schley1, C Patrick Doncaster, Tim Sluckin

  • 1School of Mathematics, University of Southampton, Highfield, Southampton, SO17 1BJ, UK.

Journal of Theoretical Biology
|July 13, 2004
PubMed
Summary

Sperm-dependent parthenogenesis allows asexual clones to reproduce using sperm without genetic contribution. Models show coexistence requires specific competitive abilities or resource exploitation strategies for these reproductive parasites.

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Area of Science:

  • Evolutionary Biology
  • Population Dynamics
  • Reproductive Strategies

Background:

  • Sperm-dependent parthenogenesis (gynogenesis/pseudogamy) involves asexual reproduction initiated by sperm, without genetic incorporation.
  • This strategy presents disadvantages of sexual reproduction (mate-finding) without its benefits (genetic diversity).
  • It occurs across diverse species, including the Enchytraeid worm Lumbricillus lineatus.

Purpose of the Study:

  • To model the density-dependent population dynamics of sperm-dependent parthenogenesis.
  • To identify conditions for coexistence between parthenogenetic and sexual populations.
  • To explore the ecological implications for species like Lumbricillus lineatus, Poeciliopsis monacha-lucida, and Schmidtea polychroa.

Main Methods:

Related Experiment Videos

  • Development of logistic population models.
  • Analysis of density-dependent dynamics and equilibria.
  • Comparison of competitive abilities and resource exploitation strategies.

    • Main Results:

    • Coexistence requires specific trade-offs: either a lower intrinsic birth rate compensated by reduced competitive impact, or superior resource exploitation with a lower intrinsic birth rate.
    • Sperm-dependent parthenogens may compete strongly for resources but can be disadvantaged by genetic uniformity.
    • Intrinsic growth advantages from reduced male gamete investment can influence persistence, potentially requiring poor competitive ability.

    Conclusions:

    • The persistence of sperm-dependent parthenogens depends on balancing reproductive advantages against competitive disadvantages.
    • Ecological factors like resource competition and intrinsic growth rates are critical for coexistence.
    • Understanding these dynamics is crucial for predicting the evolutionary trajectories of such reproductive systems.