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Related Concept Videos

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Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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Fast evolutionary genetic differentiation during experimental colonizations.

Josiane Santos1, Marta Pascual, Pedro Simões

  • 1Centro de Biologia Ambiental, Departamento de Biologia Animal, Campo Grande, 1749-016 Lisboa, Portugal. jmssantos@fc.ul.pt

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Summary
This summary is machine-generated.

Founder effects rapidly drive genetic divergence in new environments. Even with similar origins, populations quickly differentiate due to stochastic genetic sampling in early generations.

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Area of Science:

  • Evolutionary biology
  • Population genetics
  • Genomics

Background:

  • Founder effects are expected to alter genetic composition and cause differentiation between colonizing and source populations.
  • Repeated colonizations from the same source are also expected to result in differentiation among new populations.
  • Previous studies showed founder effects impact laboratory adaptation rates and cause genetic differentiation in early generations of Drosophila subobscura.

Purpose of the Study:

  • To analyze genetic differentiation among six independent foundations of Drosophila subobscura.
  • To investigate the role of sampling hierarchy, location, year, and specific sampling times in genetic divergence.
  • To understand the impact of stochastic effects and population size changes on early-stage evolution in novel environments.

Main Methods:

  • Analysis of six independent foundations of Drosophila subobscura.
  • Consideration of natural sampling hierarchy (different locations, years, and multiple samples within a year).
  • Assessment of genetic differentiation in the first two generations of laboratory culture.

Main Results:

  • Striking stochastic effects cause immediate genetic differentiation between foundations within the first two generations.
  • This divergence occurs independently of the source of origin and despite initial founder similarity.
  • Low effective population size (Ne), influenced by demographic changes and reproductive success variance, likely drives these rapid evolutionary changes.

Conclusions:

  • Rapid and significant evolutionary changes, including genetic differentiation, occur in the initial generations of a founding event.
  • Estimates of genetic differentiation based on initial wild samples may be accurate, but rapid evolution can occur in subsequent generations.
  • These findings are relevant for understanding evolution in both natural and domesticated settings, with implications for conservation efforts.