Dynamics of Bark Beetle Populations: Towards a General Productivity Model 1

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Abstract
The components of productivity (offspring produced per parent) in bark beetle populations are defined as multiplication and survival. Data from the literature are used to formulate simple models relating these components to initial density in infested trees. A simple monotonic exponential decay function is proposed for describing the multiplication component, although data for validation are scarce. A humpbacked function is proposed for the survival component. This model combines 2 equations, one expressing survival as a direct function of attack density, and the other survival as an inverse function of density.

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