Considerable research indicates that altering the level of resources (mineral nutrients, light, carbon dioxide, and water) can result in a change in the defensive profile of a plant, that is, a change in its phenotype. How much of a change and in what way depends on many factors: temperature, plant age, plant density, genotype, prior history of herbivory, and species. This helps explain why a population of a particular plant species is more or less susceptible to certain enemies in a particular place and time, but it is sufficiently complicated that no single model (or hypothesis) has high predictive power.
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