Rapid purging of genetic load in a metapopulation and consequences for range expansion in an invasive plant

Marchini, Gina L.; Sherlock, Nena Cole; Ramakrishnan, Alisa P.; Rosenthal, David; Cruzan, Mitchell B.

doi:10.1007/s10530-015-1001-5

Cited by 32 publications

(34 citation statements)

References 46 publications

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“…The accumulation of expansion load is predicted to lead to legacies of reduced fitness following expansion [40,41]. Long-range dispersal between multiple introductions from distinct genetic sources could partially mitigate this effect by helping to shelter the genetic load in recently expanded invasive populations [42], but to our knowledge this has not been explored in colonization models.…”

Section: (B) Genetic Load and Inbreeding Depressionmentioning

confidence: 99%

Invasions and extinctions through the looking glass of evolutionary ecology

Colautti

Alexander

Dlugosch

et al. 2017

Phil. Trans. R. Soc. B

116

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: (B) Genetic Load and Inbreeding Depressionmentioning

confidence: 99%

Invasions and extinctions through the looking glass of evolutionary ecology

Colautti

Alexander

Dlugosch

et al. 2017

Phil. Trans. R. Soc. B

116

102

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“…Weber et al, 2012;Dart & Eckert, 2013) and simulated under different conditions (e.g. Whitlock, 2002;Winn et al, 2011;Marchini et al, 2016), the dynamics of its evolution in natural populations is poorly known and difficult to assess. In L. cavanillesii, it seems likely that sufficient time has elapsed since the origin of SC for the population's genetic load to have been purged (Husband & Schemske, 1996;Crnokrak & Barrett, 2002).…”

Section: Implications For Understanding the Loss Of Si In L Cavanillmentioning

confidence: 99%

The divergence history of the perennial plant Linaria cavanillesii confirms a recent loss of self‐incompatibility

Voillemot

Rougemont²,

Roux

et al. 2017

J of Evolutionary Biology

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Many angiosperms prevent inbreeding through a self-incompatibility (SI) system, but the loss of SI has been frequent in their evolutionary history. The loss of SI may often lead to an increase in the selfing rate, with the purging of inbreeding depression and the ultimate evolution of a selfing syndrome, where plants have smaller flowers with reduced pollen and nectar production. In this study, we used approximate Bayesian computation (ABC) to estimate the timing of divergence between populations of the plant Linaria cavanillesii that differ in SI status and in which SI is associated with low inbreeding depression but not with a transition to full selfing or a selfing syndrome. Our analysis suggests that the mixed-mating self-compatible (SC) population may have begun to diverge from the SI populations around 2810 generation ago, a period perhaps too short for the evolution of a selfing syndrome. We conjecture that the SC population of L. cavanillesii is at an intermediate stage of transition between outcrossing and selfing.

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“…On the other hand, the smaller size of geographically marginal populations may simply mean that compatible mates are less available (Busch, 2005). Alternatively, geographically marginal populations may be those that have been more recently colonized from a range core during a range expansion, and they might therefore be experiencing the demographic and genetic effects of recent population bottlenecks (Barringer, Kulka, & Galloway, 2012; Busch, 2005; Darling et al, 2008; Husband & Barrett, 1992; Marchini, Sherlock, Ramakrishnan, Rosenthal, & Cruzan, 2016; Matos Paggi, Palma‐Silva, Bodanese‐Zanettini, Lexer, & Bered, 2015; Pannell, 2015).…”

Section: Introductionmentioning

confidence: 99%

The loss of self‐incompatibility in a range expansion

Encinas‐Viso

Young

Pannell

2020

J of Evolutionary Biology

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It is commonly observed that plant species' range margins are enriched for increased selfing rates and, in otherwise self‐incompatible species, for self‐compatibility (SC). This has often been attributed to a response to selection under mate and/or pollinator limitation. However, range expansion can also cause reduced inbreeding depression, and this could facilitate the evolution of selfing in the absence of mate or pollinator limitation. Here, we explore this idea using spatially explicit individual‐based simulations of a range expansion, in which inbreeding depression, variation in self‐incompatibility (SI), and mate availability evolve. Under a wide range of conditions, the simulated range expansion brought about the evolution of selfing after the loss of SI in range‐marginal populations. Under conditions of high recombination between the self‐incompatibility locus (S‐locus) and viability loci, SC remained marginal in the expanded metapopulation and could not invade the range core, which remained self‐incompatible. In contrast, under low recombination and migration rates, SC was frequently able to displace SI in the range core by maintaining its association with a genomic background with purged genetic load. We conclude that the evolution of inbreeding depression during a range expansion promotes the evolution of SC at range margins, especially under high rates of recombination.‬

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Rapid purging of genetic load in a metapopulation and consequences for range expansion in an invasive plant

Cited by 32 publications

References 46 publications

Invasions and extinctions through the looking glass of evolutionary ecology

Invasions and extinctions through the looking glass of evolutionary ecology

The divergence history of the perennial plant Linaria cavanillesii confirms a recent loss of self‐incompatibility

The loss of self‐incompatibility in a range expansion

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