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Why are density-dependent factors sometimes called regulating factors?

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Common wildebeest — population ecology A herd of common wildebeest (*Connochaetes taurinus*) migrating across a dusty savanna in Africa. The animal is a keystone species (i.e., a species with a disproportionately large effect on its biological community) in plains and acacia savanna ecosystems from southeastern Africa to central Kenya.

In population ecology, density-dependent factors are referred to as regulating factors because they possess the capacity to maintain population density within a specific, narrow range of values.1

These factors, which include phenomena such as competition for resources, predation, and the spread of disease, exert an influence that changes in response to the number of individuals per unit area. When a population’s density is high, these factors intensify—for instance, by increasing mortality rates due to resource scarcity or disease transmission—which helps to slow population growth. Conversely, as density decreases, the impact of these factors lessens, allowing the population to stabilize. Because they respond to the size of the population to prevent it from growing indefinitely, they act as a regulatory mechanism that keeps the population size in balance with the environment's carrying capacity.12