The molecular ecology of biological invasions: what do we know about non-additive genotypic effects and invasion success?

Roux, Johannes J. Le; Blignaut, Marguerite; Gildenhuys, Enelge; Mavengere, Natasha R.; Berthouly‐Salazar, Cécile

doi:10.1007/s10530-013-0568-y

Cited by 4 publications

(3 citation statements)

References 29 publications

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Section: Complementaritymentioning

confidence: 99%

“…Complementarity will occur immediately under multiple introductions, even before interbreeding. It should be most beneficial at low genetic diversity within a focal population, where niche diversity among genotypes is low, and become increasingly likely as divergence between admixing populations increases and greater numbers of genotypes are combined (Le Roux, Blignaut, Gildenhuys, Mavengere, & Berthouly‐Salazar, ; Wang et al, ), though this effect may plateau with diversity after niches are exhausted (Ellers, Rog, Braam, & Berg, ). Evolutionary Rescue . Finally, across multiple generations and longer timescales, populations that will go extinct or fail to spread because they lack adaptation to local conditions could be rescued by inputs of additional genetic variation, a scenario known as “evolutionary rescue” (Carlson, Cunningham, & Westley, ).…”

Section: Introductionmentioning

confidence: 99%

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Potential limits to the benefits of admixture during biological invasion

et al. 2018

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Species introductions often bring together genetically divergent source populations, resulting in genetic admixture. This geographic reshuffling of diversity has the potential to generate favorable new genetic combinations, facilitating the establishment and invasive spread of introduced populations. Observational support for the superior performance of admixed introductions has been mixed, however, and the broad importance of admixture to invasion questioned. Under most underlying mechanisms, admixture’s benefits should be expected to increase with greater divergence among and lower genetic diversity within source populations, though these effects have not been quantified in invaders. We experimentally crossed source populations differing in divergence in the invasive plant Centaurea solstitialis. Crosses resulted in many positive (heterotic) interactions, but fitness benefits declined and were ultimately negative at high source divergence, with patterns suggesting cyto-nuclear epistasis. We explored the literature to assess whether such negative epistatic interactions might be impeding admixture at high source population divergence. Admixed introductions reported for plants came from sources with a wide range of genetic variation, but were disproportionately absent where there was high genetic divergence among native populations. We conclude that while admixture is common in species introductions and often happens under conditions expected to be beneficial to invaders, these conditions may be constrained by predictable negative genetic interactions, potentially explaining conflicting evidence for admixture’s benefits to invasion.

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Section: Complementaritymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Potential limits to the benefits of admixture during biological invasion

et al. 2018

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“…As diversity increases within a population, different genotypes may occupy somewhat different and complementary niches, sometimes increasing the mean fitness across the population as a whole (Crawford & Whitney 2010;Chen et al 2015). Complementarity should be most beneficial at low genetic diversity within a focal population, where niche diversity among genotypes is low, and become increasingly likely as divergence between admixing populations increases and greater numbers of genotypes are combined (Wang et al 2012;Le Roux et al 2014), though this effect may plateau after niches are exhausted (Ellers et al 2011).…”

Section: Introductionmentioning

confidence: 99%

The prevalence and benefits of admixture during species invasions: a role for epistasis?

Barker

Cocio

Anderson

et al. 2017

Preprint

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Species introductions often bring together genetically divergent source populations, resulting in genetic admixture. This geographic reshuffling of diversity has the potential to generate favorable new genetic combinations, facilitating the establishment and invasive spread of introduced populations. Observational support for the superior performance of admixed introductions has been mixed, however, and the broad importance of admixture to invasion questioned. Under most underlying mechanisms, admixture’s benefits should be expected to increasewith greater divergence among and lower genetic diversity within source populations. We use a literature survey to quantify the prevalence of admixture and evaluate whether it occurrs under circumstances predicted to be mostbeneficial to introduced species. We find that 39% of species are reported to be admixed when introduced. Admixed introductions come from sources with a wide range of genetic variation, but are disproportionately absent where there is high genetic divergence among native populations. We discuss multiple potential explanations for these patterns, but note that negative epistatic interactions should be expected at high divergence amongpopulations (outbreeding depression). As a case study, we experimentally cross source populations differing in divergence in the invasive plantCentaurea solstitialis. We find many positive (heterotic) interactions, but fitness benefits decline and are ultimately negative at high source divergence, with patterns suggestingcyto-nuclear epistasis. We conclude that admixture is common in species introductions and often happens under conditions expected to be beneficial to invaders, but that these conditions may be constrained by predictable negativegenetic interactions, potentially explaining conflicting evidence for admixture's benefits to invasion.

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Complementarity effects do not necessarily result in significant transgressive over-performance in mixtures

et al. 2014

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Recent empirical studies have shown that genetic factors can influence the invasion success of alien species. Like species diversity, higher genetic diversity can increase plant performance or invasion success via selection effects or complementarity effects. The latter have also been referred to as nonadditive effects because in this case individual genotypes show a different performance in mixtures than in monocultures. Based on a manipulation experiment in the field, a recent study found that such nonadditive effects of genotype mixing become stronger over time in an invasive plant, probably due to higher resource uptake or facilitation between genotypes. Other researchers criticized this interpretation because in their view complementarity or non-additive effects should lead to transgressive over-performance which could not occur based on selection effects alone, where simply differences of performance between genotypes would enhance the invasion ability of multiple-genotype patches. In a commentary paper we applied Monte Carlo permutation and Loreau and Hector's additive partitioning to two datasets and found that although transgressive over-performance cannot occur due to only selection effects and thus is the most stringent test for the existence of complementarity effects, complementarity effects also commonly occur without transgressive over-performance.

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The molecular ecology of biological invasions: what do we know about non-additive genotypic effects and invasion success?

Cited by 4 publications

References 29 publications

Potential limits to the benefits of admixture during biological invasion

Potential limits to the benefits of admixture during biological invasion

The prevalence and benefits of admixture during species invasions: a role for epistasis?

Complementarity effects do not necessarily result in significant transgressive over-performance in mixtures

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