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Genetic Drift03:33

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Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.Life is not fair. A deer grazing contentedly in a field can have her meal cut tragically short by a bolt of lightning. If the doomed doe is one of only three in the population, 1/3 of the population’s gene pool is lost. Random events like this can...
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Published on: February 3, 2023

Genetic bottlenecks driven by population disconnection.

Thomas Broquet1, Sonia Angelone, Julie Jaquiery

  • 1Department of Ecology and Evolution, University of Lausanne, CH-1015 Lausanne, Switzerland. thomas.broquet@sb-roscoff.fr

Conservation Biology : the Journal of the Society for Conservation Biology
|July 30, 2010
PubMed
Summary
This summary is machine-generated.

Population disconnection can mimic a genetic bottleneck by reducing allelic richness more than gene diversity. This occurs even without a drop in population size, impacting genetic variation.

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Area of Science:

  • Population genetics
  • Conservation genetics
  • Evolutionary biology

Background:

  • Population connectivity is vital for maintaining genetic diversity, especially in small populations vulnerable to genetic drift.
  • Disconnection negatively impacts allelic richness and gene diversity, with established empirical evidence.
  • The genetic signature of a demographic bottleneck is typically associated with a reduction in population size.

Purpose of the Study:

  • To investigate if population disconnection, without demographic collapse, can induce a genetic bottleneck signature.
  • To compare the effects of disconnection on allelic richness and gene diversity.
  • To document the disequilibrium in allelic frequency distributions caused by disconnection.

Main Methods:

  • Individual-based simulations were used to model population dynamics and genetic variation.
  • Empirical data from European tree frog populations were analyzed.
  • Six pairs of isolated versus well-connected populations were studied.

Main Results:

  • Simulations showed population disconnection reduced allelic richness more than heterozygosity.
  • This imbalance created a temporary excess in gene diversity, mimicking a bottleneck signature.
  • Empirical data from isolated tree frog populations corroborated these findings.

Conclusions:

  • Population disconnection can generate a genetic bottleneck signature independently of demographic collapse.
  • Reduced connectivity can lead to a false signal of a bottleneck due to altered genetic diversity.
  • Understanding this effect is crucial for accurate conservation genetics assessments.