Genomic admixture increases fitness during a biological invasion

Keller, Stephen R.; Taylor, Douglas R.

doi:10.1111/j.1420-9101.2010.02037.x

Cited by 203 publications

(250 citation statements)

References 65 publications

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“…Positive effects of admixture have been observed in invasive populations that show heterozygosity-fitness correlations in the introduced range [46,54]. The fitness benefits of a heterozygous genome are likely to be especially strong for small, declining and inbred populations of endangered species that are unable to purge deleterious mutations [55].…”

Section: (C) the Pros And Cons Of Genetic Admixturementioning

confidence: 99%

Invasions and extinctions through the looking glass of evolutionary ecology

Colautti

Alexander

Dlugosch

et al. 2017

Phil. Trans. R. Soc. B

111

102

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One contribution of 18 to a theme issue 'Human influences on evolution, and the ecological and societal consequences'. Invasive and endangered species reflect opposite ends of a spectrum of ecological success, yet they experience many similar eco-evolutionary challenges including demographic bottlenecks, hybridization and novel environments. Despite these similarities, important differences exist. Demographic bottlenecks are more transient in invasive species, which (i) maintains ecologically relevant genetic variation, (ii) reduces mutation load, and (iii) increases the efficiency of natural selection relative to genetic drift. Endangered species are less likely to benefit from admixture, which offsets mutation load but also reduces fitness when populations are locally adapted. Invading species generally experience more benign environments with fewer natural enemies, which increases fitness directly and also indirectly by masking inbreeding depression. Adaptive phenotypic plasticity can maintain fitness in novel environments but is more likely to evolve in invasive species encountering variable habitats and to be compromised by demographic factors in endangered species. Placed in an eco-evolutionary context, these differences affect the breadth of the ecological niche, which arises as an emergent property of antagonistic selection and genetic constraints. Comparative studies of invasions and extinctions that apply an eco-evolutionary perspective could provide new insights into the environmental and genetic basis of ecological success in novel environments and improve efforts to preserve global biodiversity.This article is part of the themed issue 'Human influences on evolution, and the ecological and societal consequences'.

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Section: (C) the Pros And Cons Of Genetic Admixturementioning

confidence: 99%

Invasions and extinctions through the looking glass of evolutionary ecology

Colautti

Alexander

Dlugosch

et al. 2017

Phil. Trans. R. Soc. B

111

102

View full text Add to dashboard Cite

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“…Several population genetic studies have revealed mixed ancestries of invasive populations reflecting genetic admixture of multiple divergent native source populations (e.g., Kolbe et al., 2004; Rosenthal, Ramakrishnan, & Cruzan, 2008; Chun, Fumanal, Laitung, & Bretagnolle, 2010; Stephen R. Keller, Gilbert, Fields, & Taylor, 2012). Moreover, some studies also provide evidence for phenotypic changes and effects on fitness associated with admixture (Kolbe, Larson, & Losos, 2007; Facon, Pointier, Jarne, Sarda, & David, 2008; S. R. Keller & Taylor, 2010). However, although these observational studies suggest a strong link of genetic admixture and invasion success, it remains difficult to disentangle the direct effects of genetic admixture (e.g., heterosis) from long‐term effects of increases in genetic variation (evolutionary potential), as well as other confounding effects such as propagule pressure that may be associated with multiple introductions.…”

Section: Introductionmentioning

confidence: 99%

Genetic admixture and heterosis may enhance the invasiveness of common ragweed

Hahn

Rieseberg

2016

Evolutionary Applications

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Biological invasions are often associated with multiple introductions and genetic admixture of previously isolated populations. In addition to enhanced evolutionary potential through increased genetic variation, admixed genotypes may benefit from heterosis, which could contribute to their increased performance and invasiveness. To deepen our understanding of the mechanisms and management strategies for biological invasions, we experimentally studied whether intraspecific admixture causes heterosis in common ragweed (Ambrosia artemisiifolia) by comparing the performance of crosses (F1) between populations relative to crosses within these populations for each range (native, introduced) under different ecologically relevant conditions (control, drought, competition, simulated herbivory). Performance of admixed genotypes was highly variable, ranging from strong heterotic effects to weak outbreeding depression. Moreover, heterosis was not uniformly observed among between‐population crosses, but certain native population crosses showed considerable heterosis, especially under simulated herbivory. In contrast, heterosis was largely absent in crosses from the introduced range, possibly implying that these populations were already admixed and benefit little from further mixing. In conclusion, these results support the hypothesis that heterosis may contribute to biological invasions, and indicate the need to minimize new introductions of exotic species, even if they are already present in the introduced range.

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“…As indicated above, one such factor is admixture among conspecific populations, which can increase standing genetic variation and generate novel, adaptive combinations resulting in enhanced adaptability at the range edge [27,28,32,33,58]. Nevertheless, lack of genetic variation in peripheral populations and lack of new beneficial mutations can still restrict the extent to which genetic exchange among conspecific populations enhances their adaptability at the range edge [57,59].…”

Section: Hybridization's Role In Range Expansionmentioning

confidence: 99%

Hybridization as a facilitator of species range expansion

Pfennig¹,

Kelly²,

Pierce³

2016

Proc. R. Soc. B.

151

152

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Explaining the evolution of species geographical ranges is fundamental to understanding how biodiversity is distributed and maintained. The solution to this classic problem in ecology and evolution remains elusive: we still do not fully know how species geographical ranges evolve and what factors fuel range expansions. Resolving this problem is now more crucial than ever with increasing biodiversity loss, global change and movement of species by humans. Here, we describe and evaluate the hypothesis that hybridization between species can contribute to species range expansion. We discuss how such a process can occur and the empirical data that are needed to test this hypothesis. We also examine how species can expand into new environments via hybridization with a resident species, and yet remain distinct species. Generally, hybridization may play an underappreciated role in influencing the evolution of species ranges. Whether-and to what extent-hybridization has such an effect requires further study across more diverse taxa.

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Genomic admixture increases fitness during a biological invasion

Cited by 203 publications

References 65 publications

Invasions and extinctions through the looking glass of evolutionary ecology

Invasions and extinctions through the looking glass of evolutionary ecology

Genetic admixture and heterosis may enhance the invasiveness of common ragweed

Hybridization as a facilitator of species range expansion

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