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Density-independent factors can affect a population of organisms no matter how small or large the population may be. Examples of Density-Independent Factors. Most density-independent factors are abiotic, or nonliving. Some commonly used examples include temperature, floods, and pollution. How could temperature be a factor in determining the density of a population? Imagine a heavily forested area that is home to a population of mosquitoes.
In population ecology, density-dependent processes occur when population growth rates are regulated by the density of a population. Most density-dependent factors, which are biological in nature (biotic), include predation, inter- and intraspecific competition, accumulation of waste, and diseases such as those caused by parasites. Usually, the denser a population is, the greater its mortality rate.