Cited by 816Genetic diversity and population structureEvolution and Genetic DynamicsForensic and Genetic Research

THE HIDDEN SIDE OF INVASIONS: MASSIVE INTROGRESSION BY LOCAL GENES

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Currat, Mathias, Ruedi, Manuel, Petit, Rmy J., Excoffier, Laurent·2008·Evolution

Abstract

Despite hundreds of reports involving both plants and animals, the mechanisms underlying introgression remain obscure, even if some form of selection is frequently invoked. Introgression has repeatedly been reported in species that have recently colonized a new habitat, suggesting that demographic processes should be given more attention for understanding the mechanisms of introgression. Here we show by spatially explicit simulations that massive introgression of neutral genes takes place during the invasion of an occupied territory if interbreeding is not severely prevented between the invading and the local species. We also demonstrate that introgression occurs almost exclusively from the local to the invading species, especially for populations located far away from the source of the invasion, and this irrespective of the relative densities of the two species. This pattern is strongest at markers experiencing reduced gene flow, in keeping with the observation that organelle genes are often preferentially introgressed across species boundaries. A survey of the literature shows that a majority of published empirical studies of introgression during range expansions, in animals and in plants, follow the predictions of our model. Our results imply that speciation genes can be identified by comparing genomes of interfertile native and invading species pairs.

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Crossref · 10.1111/j.1558-5646.2008.00413.x

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  • Population range expansions tend to disproportionately increase the genetic contribution of the local population to the invasive genetic pool, even if interbreeding is limited.

    “In addition, when admixture with a local population occurs, population expansions tend to disproportionately increase the genetic contribution of the local population to the invasive genetic pool, even if interbreeding is limited (29).”

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Authors
Currat, M., Ruedi, M., Petit, R. J., & Excoffier, L.
Affiliations
  • University of Geneva (CH)
  • University of Bern (CH)
Corresponding author
Currat, Mathias
Venue
Evolution
Published
2008-06
Volume
62
Issue
8
Pages
???-???
ISSN
  • 0014-3820 (ISSN-L)
  • 1558-5646
OpenAlex
W2029478825
Cited by
816
References
78
Citations by year
2026: 13 · 2025: 28 · 2024: 37 · 2023: 45 · 2022: 54 · 2021: 51 · 2020: 46 · 2019: 59 · 2018: 47 · 2017: 57 · 2016: 57 · 2015: 42 · 2014: 49 · 2013: 56 · 2012: 50
FWCI
23.81
Type
journal article
Language
en
Open access
Locations
  • Evolution (publishedVersion)
  • PubMed (publishedVersion)
  • Archive ouverte UNIGE (University of Geneva) (submittedVersion, cc-by)
  • BioOne Complete (BioOne) (submittedVersion)
  • HAL (submittedVersion)
  • BORIS (University Library Bern) (submittedVersion)
  • Oskar-Bordeaux (Universite de Bordeaux) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic diversity and population structure
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Evolution and Genetic Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Forensic and Genetic Research
Keywords
introgression, biological invasions, range expansion, gene flow, spatially explicit simulation, speciation genes
MeSH terms
Animals, Computer Simulation, Crosses, Genetic, Biological Evolution, Genetics, Population, Humans, Hybridization, Genetic, Models, Biological, Models, Genetic, Selection, Genetic, Species Specificity, Gene Flow

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