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Related Experiment Videos

Selection by parasites for clonal diversity and mixed mating

C M Lively1, R S Howard

  • 1Department of Biology, Indiana University, Bloomington 47405.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|November 29, 1994
PubMed
Summary

Parasites can favor sexual reproduction over asexual reproduction by promoting genetic diversity. This diversity helps offspring evade infections, maintaining cross-fertilization as a stable evolutionary strategy.

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Area of Science:

  • Evolutionary biology
  • Parasitology
  • Reproductive strategies

Background:

  • Sexual reproduction offers a twofold advantage in offspring production over asexual reproduction.
  • Cross-fertilization is theorized to produce genetically rare offspring, enhancing parasite evasion.

Purpose of the Study:

  • To investigate the impact of parasites on parthenogenetic mutants within sexual populations.
  • To explore how parasites influence the evolution of uniparental reproduction in cosexual populations.

Main Methods:

  • Computer simulations were employed to model parasite-mutant interactions.
  • Strategy models were used to analyze reproductive strategies in cosexual populations.

Main Results:

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  • Parasites can drive the accumulation of diverse resistance genotypes through parthenogenesis, potentially outcompeting sexual populations.
  • Muller's ratchet, coupled with parasite coevolution, can stabilize cross-fertilization.
  • Parasites and inbreeding depression may interact to favor mixed reproductive strategies.

    • Conclusions:

    • Coevolutionary dynamics with parasites can maintain sexual reproduction, even with the advantages of asexual reproduction.
    • Parasites play a significant role in the evolutionary stability of cross-fertilization and mixed reproductive strategies.