because it lowers the pest's population density, it depends on density.
Another element that depends on density is predation. When the population of a species of prey increases, predators will benefit from the more plentiful food source and will typically eat more of that prey as the population increases.
In the process of estimating and assessing population increase, both density dependence and density independence may coexist. The relationship between a population's growth rate and density can be examined to see if there is any density dependence.
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