population bottleneck

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  • Info A population bottleneck is a sharp reduction in the size of a population due to environmental events (such as earthquakes, floods, fires, or droughts) or human activities (such as genocide). more...
  • There have been many known cases of population bottleneck in the recent past.
  • There has been no evidence for population bottlenecks in the species.
  • Population bottlenecks are when population size reduces for a short period of time.
  • A population bottleneck may also cause a founder effect even though it is not strictly a new population.
  • It has since recolonized much of its historic range, but has a population bottleneck.
  • Such an event would cause a population bottleneck and lead to scattered, isolated populations.
  • This indicates that the species went through a severe population bottleneck.
  • The founder effect can cause rapid, individual-based speciation and is the most dramatic example of a population bottleneck.
  • Over-hunting also caused a severe population bottleneck in the northern elephant seal in the 19th century.
  • A population bottleneck is when a population contracts to a significantly smaller size over a short period of time due to some random environmental event.
  • It is also normal that breeds go through population bottlenecks because of the popular sire syndrome.
  • This population bottleneck can be explained by young residents moving outside the city upon adulthood and families with children moving to the city at a relatively late age.
  • Over the years, the koala population has experienced a loss of genetic diversity through population bottlenecks and founder effects.
  • A common example of a population bottleneck is the Northern elephant seal.
  • Periods of low population density may also have created moderate population bottlenecks, reducing genetic diversity.
  • Past events that can be inferred include population expansion, population bottlenecks, vicariance and migration.
  • These restricted ranges may result in population bottlenecks that reduce genetic variation.
  • They often result in population bottlenecks, which have harmful consequences for the survival of that population.
  • In this example the population contracted to just four random survivors, a phenomenon known as population bottleneck.
  • Population bottlenecks thus tend to slow down observed mutation rates.
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