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Related Experiment Video

Updated: Feb 24, 2026

Determination of Self- and Inter-incompatibility Relationships in Apricot Combining Hand-Pollination, Microscopy and Genetic Analyses
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Range Expansion Compromises Adaptive Evolution in an Outcrossing Plant.

Santiago C González-Martínez1, Kate Ridout2, John R Pannell2

  • 1Department of Ecology and Evolution, University of Lausanne, 1015 Lausanne, Switzerland; BIOGECO, INRA, University of Bordeaux, 33610 Cestas, France.

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|August 15, 2017
PubMed
Summary

Species range expansion can lead to the accumulation of harmful mutations and reduced fitness, particularly at the expanding front. This study in Mercurialis annua confirms colonization bottlenecks compromise adaptive potential in plants.

Keywords:
Mercurialis annuacolonizationdeleterious mutationdispersalpopulation structurepositive selectionselective sweepsite frequency spectrum

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Area of Science:

  • Evolutionary biology
  • Population genetics

Background:

  • Range expansion influences natural selection and genetic polymorphism patterns.
  • Theory predicts deleterious mutation accumulation and reduced positive selection efficacy during expansion.
  • Previous studies on human expansion yielded contradictory results regarding selection efficacy.

Purpose of the Study:

  • To analyze polymorphism patterns in Mercurialis annua during its range expansion.
  • To investigate the impact of colonization bottlenecks on mutation accumulation and selection.
  • To test theoretical predictions in a plant species with contrasting climate habitats.

Main Methods:

  • Analysis of 578,125 single nucleotide polymorphisms (SNPs) across 17,648 genes in Mercurialis annua.
  • Comparison of polymorphism patterns between range-front and core populations.
  • Inference of mutation load, genetic load, and selective sweep efficacy.

Main Results:

  • Confirmed strong signatures of bottlenecks in range-front populations.
  • Revealed accumulation of deleterious mutations, more homozygous in range-front individuals, indicating increased genetic load.
  • Inferred reduced efficacy of selective sweeps in range-front versus core populations, persisting despite gene flow.

Conclusions:

  • Colonization bottlenecks during range expansion compromise adaptive potential.
  • Findings support theories on mutation dynamics under selection during expansion, extending evidence from humans to plants.
  • Deleterious mutation accumulation and reduced selection efficacy are significant consequences of range expansion in plants.