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Related Experiment Videos

Genotypic vs. condition effects on parasite-driven rare advantage.

M F Dybdahl1, A C Krist

  • 1School of Biological Sciences, Washington State University, Pullman, WA, USA. dybdahl@wsu.edu

Journal of Evolutionary Biology
|August 18, 2004
PubMed
Summary

Host condition impacts snail susceptibility to parasites, but does not change which snail genotypes are most vulnerable. This supports the Red Queen hypothesis for sex maintenance in coevolving populations.

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Area of Science:

  • Evolutionary biology
  • Parasitology
  • Ecology

Background:

  • Coevolutionary models often assume genetic control of host resistance and parasite infectivity.
  • Nongenetic factors like physiology and environment can influence host susceptibility.
  • Understanding these influences is crucial for coevolutionary dynamics.

Purpose of the Study:

  • To investigate how host genotype and condition affect snail susceptibility to trematode parasites.
  • To determine if host condition alters the specificity of host-parasite interactions.
  • To test support for the Red Queen hypothesis in a freshwater snail-trematode system.

Main Methods:

  • Laboratory infection experiment using a clonal freshwater snail population (Potamopyrgus antipodarum).
  • Assessed susceptibility across different life-history stages: juveniles, brooding females, and non-brooding females.

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  • Analyzed the interaction between snail clonal genotype and host condition (age, reproductive status).

    • Main Results:

    • Both life-history state and clonal genotype significantly affected parasite infection prevalence.
    • Host condition influenced susceptibility but did not alter the relative resistance of different snail genotypes.
    • Rare genotypes showed lower infection rates than common genotypes across life-history states.

    Conclusions:

    • Host condition modulates susceptibility but maintains genotype-specific resistance patterns.
    • Findings support the Red Queen hypothesis by demonstrating stable genetic interactions despite environmental influences.
    • The study highlights the importance of considering both genetic and physiological factors in host-parasite coevolution.