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Related Experiment Videos

Specific and non-specific defense against parasitic attack.

S A Frank1

  • 1Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92697-2525, USA. safrank@uci.edu

Journal of Theoretical Biology
|February 10, 2000
PubMed
Summary

This study models host defense strategies, finding that specific defense varies with parasite traits and non-specific defense depends on investment rates. Combined defenses can lead to apparent negative resistance costs.

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Area of Science:

  • Evolutionary biology
  • Immunology
  • Mathematical modeling

Background:

  • Host defense involves specific (genotype-targeting) and non-specific (broad-acting) mechanisms.
  • Empirical studies show variability in either specific or non-specific defense, but not always both.
  • Understanding the conditions favoring variation in each defense type is crucial for evolutionary and ecological insights.

Purpose of the Study:

  • To analyze a model incorporating both specific and non-specific host defenses.
  • To determine the conditions that promote detectable variation in each defense strategy.
  • To investigate the interplay between specific and non-specific defense investment and their evolutionary consequences.

Main Methods:

  • Developed a mathematical model of host-parasite interactions with combined defense strategies.

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  • Analyzed how investment in resistance affects defense efficacy under different scenarios.
  • Examined the conditions influencing the maintenance of variation in specific and non-specific defenses.

    • Main Results:

    • High variation in non-specific defense correlates with accelerating returns on investment.
    • Variation in specific defense increases with parasite's cost of virulence and decreases with host range.
    • Higher non-specific defense levels stabilize specific defense dynamics, favoring negative associations between defense costs.

    Conclusions:

    • The model predicts conditions favoring variation in specific versus non-specific defense.
    • Negative associations between defense components can arise, confounding resistance cost measurements.
    • Apparent negative costs of resistance may be observed due to trade-offs between specific and non-specific defense investments.