The continued growth of a population with a young age...

The continued growth of a population with a young age structure, even after its fertility rate has declined, is known as (a) population doubling (b) iteroparity (c) population growth momentum (d) $r$ selection
(e) density dependence

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Key Concepts

Age Structure

Age structure is the distribution of individuals of various ages within a population. A population that is predominantly young will have a large proportion of individuals entering or already in their reproductive years, which can result in continued population growth even if the number of children per family decreases.

Fertility Rate

The fertility rate is the average number of children that would be born per woman over her lifetime. It is a key factor in population dynamics; however, even when the fertility rate declines, the effects of past higher fertility—such as a young age structure—can sustain population growth for a period of time.

Population Momentum

Population momentum refers to the phenomenon where a population continues to increase even after reaching replacement-level fertility rates. This occurs because the age structure of the population, particularly a high proportion of young individuals due to previous high fertility, ensures that the number of births remains high for some time, driving growth despite a decline in the fertility rate.

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