population bottleneck

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population bottleneck

[‚päp·yə′lā·shən ′bäd·əl‚nek]
(evolution)
Genetic drift that occurs as a result of a drastic reduction in population by an event having little to do with the usual forces of natural selection.
References in periodicals archive ?
1997: Description and power analysis of two tests for detecting recent population bottlenecks from allele frequency data.
One of Reich's findings was the presence of large numbers of what he terms 'population bottlenecks'.
Another factor that is problematic for determining the occurrence of population bottlenecks is that field sampling methods likely introduce significant temporal bias.
To estimate the population size reduction at the mature stage, recent population bottlenecks were evaluated using version 1.2.02 of the BOTTLENECK software [30].
Because microsatellites evolve rapidly, they can provide useful data for studies on recent gene flow and population bottlenecks (Neuwald, 2010).
Population bottlenecks and non-equilibrium models in population genetics.
Beginning with population bottlenecks as an easily comprehensible example of where chance plays a major role, the book extends this concept to organisms with small numbers of cells and particularly focuses on Bonner's specialty, slime molds.
Several factors can of course affect genetic diversity, including population structure (Cherry and Wakeley, 2003), population bottlenecks (O'Brien, 1994), natural selection and mating systems (Hedrick, 2005).
Previous studies had suggested that populations grew in size but not in genetic diversity, with variants squeezed out by natural selection and population bottlenecks as humans colonized the world.
So population bottlenecks that kill off diversity and restart the population from a single cell are powerful stabilizers of cellular cooperation, the scientists conclude.
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