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population bottleneck

Definition Source References

A decrease in the gene pool of the population due to an event that drastically reduces the size of that population, such as an environmental disaster, the hunting of a species to the point of extinction, or habitat destruction that results in the deaths of organisms. Due to the event, many alleles, or gene variants, that were present in the original population are lost and the remaining population has a very low level of genetic diversity.

Global assessment (1st work programme) Nature, 2018d