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Definition of 'limiting factor'. limiting factor in American. an environmental factor that limits the growth or activities of an organism or that restricts the size of a population or its geographical range.
Two density-dependent limiting factors include competition and disease. Both of these factors rely on the size and density of a population because it creates conflict over limited resources (competition) and the more dense a population is, the easier it is for pathogens to spread and infect many individuals (disease).f the population density in the ecosystem were to increase, competition over these cacti would increase, making this a density-dependent limiting factor. Only a certain density of Cactus Wren can be supported in an ecosystem. Another example of a density-dependent limiting factor is disease.