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The effective population size (Ne) is defined as "the number of breeding individuals in an idealized population that would show the same amount of dispersion of allele frequencies under random genetic drift or the same amount of inbreeding as the population under consideration." Ne is usually less than N (the absolute population size) and this has important applications in conservation genetics.
Small population size results in increased genetic drift. Population bottlenecks are when population size reduces for a short period of time, decreasing the genetic diversity in the population. This phenomenon can also lead to the founder effect.
- Holocene extinction event
- Population growth rate
- Carrying capacity
- Lists of organisms by population
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