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Host tolerance does not impose selection on natural enemies.

Etzel Garrido Espinosa1, Juan Fornoni

  • 1Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Ap. Postal 70-275, CP 04510, México Distrito Federal, México.

The New Phytologist
|April 22, 2006
PubMed
Summary

Host tolerance did not impact herbivore performance, suggesting it may reduce coevolutionary opportunities. Resistance, however, did affect herbivore survival, indicating potential for coevolution.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Plant-Insect Interactions

Background:

  • Coevolutionary dynamics between hosts and natural enemies are often attributed to the evolution of resistance traits.
  • Host tolerance as an alternative defensive strategy is recognized, but its role in interaction outcomes remains debated.

Purpose of the Study:

  • To investigate if variation in host tolerance among plant genotypes influences selection pressure on a specialist herbivore.
  • To determine the impact of host tolerance and resistance on herbivore performance and potential for coevolution.

Main Methods:

  • Bioassay experiments were conducted using selected plant genotypes and a specialist herbivore.
  • Herbivore performance metrics including survival, weight gain, food consumption, and developmental time were measured.

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Main Results:

  • Host tolerance did not significantly affect herbivore survival, growth, or development.
  • Plant resistance traits negatively impacted herbivore larva survival.
  • Genetic variation in herbivore survival suggests potential for coevolutionary adaptation.

Conclusions:

  • Host tolerance does not appear to impose selection pressure on this specialist herbivore.
  • Host tolerance may limit the scope for coevolutionary responses from natural enemies.
  • Host tolerance might be an evolutionarily unstable defensive strategy, contrary to some theoretical models.