Population bottleneck
event that reduces size and genetic variation of a population, followed by a size recovery
A genetic bottleneck occurs when many individuals of a species are killed (or die) because of a natural event, such as a famine or a disease. The phenomenon is also called population bottleneck.The result of this, is that the gene pool will be smaller, and the genetic diversity will also be smaller, in future generations. This can have effects, such as an inbreeding depression.