Question

An introduced insect is devastating several related plant species within a diverse natural area. An environmental manager is tasked with developing and preserving the area. He decides to use a biological control method, a parasitic fly that feeds on the pest insect's larvae. Would this be considered a density-dependent or a density-independent approach to population control? A. Density-independent, because it is not likely to completely control the pest's density B. Density-independent, because both pest and biological control agent are introduced C. Density-independent, because the parasite could become a pest, causing a natural disaster D. Density-dependent, because it reduces the population density of the pest E. Density-dependent, because both pest and biological control agent are introduced

Answer 1

because it lowers the pest's population density, it depends on density.

The reason why predation 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.

What indicators exist that a population is density-dependent?

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.

Learn more about density independence here:

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