Abstract

The growth-rate hypothesis outlined by Coley et al. is based on a model which predicts that investment of resources in anti-herbivore defenses by plants should increase as intrinsic growth rate decreases. This prediction is based on a model which assumes α > β (α = constant relating defense investment to reduction in growth, β = constant determining defense effectiveness). Under conditions in which β > α, the model predicts either no investment in anti-herbivore defenses for plants with relatively high intrinsic growth rates or a maximum investment in anti-herbivore defenses for plants with relatively low intrinsic growth rates. Conditions in which β > α are realistic for both immobile and mobile defenses

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