Bridgehead Effects and Role of Adaptive Evolution in Invasive Populations

Bertelsmeier, Cléo; Keller, Laurent

doi:10.1016/j.tree.2018.04.014

Cited by 111 publications

(94 citation statements)

References 43 publications

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“…We also did not find support for the hypothesis that the process of invasion acts as a filter, with no evidence for strong selection on behaviour that may facilitate further introductions. Instead of adaptive evolution, it is likely that factors such as increased abundance in introduced range combined with ease of human‐mediated transport play a large part in the Argentine ant's invasion success (Bertelsmeier & Keller, ; Bertelsmeier, Ollier, Liebhold, & Keller, ; Bertelsmeier et al., ; Suarez, Holway, & Case, ). However, an investigation of other behavioural traits such as social organisation or a more extensive survey of interspecific aggression in relation to the introduction pathway would complement the focus on foraging and exploratory behaviour in this study.…”

Section: Discussionmentioning

confidence: 99%

Behavioural variation and plasticity along an invasive ant introduction pathway

Felden

Paris

Chapple

et al. 2018

Journal of Animal Ecology

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Once established in new areas, introduced species may exhibit changes in their biology due to phenotypic plasticity, novel selection pressures and genetic drift. Moreover, the introduction process itself has been hypothesised to act as a selective filter for traits that promote invasiveness. We tested the hypothesis that behaviours thought to promote invasiveness-such as increased foraging activity and aggression-are selected for during invasion by comparing traits among native and introduced populations of the widespread Argentine ant (Linepithema humile). We studied Argentine ant populations in the native range in Argentina and in three invaded regions along an introduction pathway: California, Australia and New Zealand. In each region, we set up 32 experimental colonies to measure foraging activity and interspecific aggression in a subset of the study regions. These colonies were subject to experimental manipulation of carbohydrate availability and octopamine, a biogenic amine known to modulate behaviour in insects, to measure variation in behavioural plasticity. We found variation in foraging activity among populations, but this variation was not consistent with selection on behaviour in relation to the invasion process. We found that colonies with limited access to carbohydrates exhibited unchanged exploratory behaviour, but higher exploitation activity and lower aggression. Colonies given octopamine consistently increased foraging behaviour (both exploration and exploitation), as well as aggression when also sugar-deprived. There was no difference in the degree of behavioural response to our experimental treatments along the introduction pathway. We did not find support for selection of behavioural traits associated with invasiveness along the Argentine ant's introduction pathway or clear evidence for an association between the introduction process and variation in behavioural plasticity. These results indicate that mechanisms promote behavioural variation in a similar fashion both in native and introduced ranges. Our results challenge the assumption that introduced populations always perform better in key behavioural traits hypothesised to be associated with invasion success.

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Section: Discussionmentioning

confidence: 99%

Behavioural variation and plasticity along an invasive ant introduction pathway

Felden

Paris

Chapple

et al. 2018

Journal of Animal Ecology

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“…A major consequence of evolution at leading edges is that species spread rates accelerate but are also relatively unpredictable (Ochocki & Miller, ; Phillips, Brown, & Shine, ; Weiss‐Lehman, Hufbauer, & Melbourne, ; Williams, Kendall, & Levine, ). Researchers generally see the signature of selection in this pattern, notably through spatial sorting, although conclusive evidence of adaptation during spread remains rare (Bertelsmeier & Keller, ; Colautti & Lau, ). Genetic drift is another important evolutionary force at play in nonequilibrium situations (Keller & Taylor, ; Slatkin & Excoffier, ), and range expansions are thus expected to be accompanied by large stochastic rearrangements of allele frequencies, with potential phenotypic consequences (Excoffier et al, ; Klopfstein, Currat, & Excoffier, ; Peischl et al, ).…”

Section: Introductionmentioning

confidence: 99%

Genetic drift during the spread phase of a biological invasion

et al. 2019

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Recent theoretical and experimental models have revealed the role played by evolution during species spread, and in particular have questioned the influence of genetic drift at range edges. By investigating the spread of an aquatic invader in patchy habitats, we quantified genetic drift and explored its consequences for genetic diversity and fitness. We examined the interplay of gene flow and genetic drift in 36 populations of the red swamp crayfish, Procambarus clarkii, in a relatively recently invaded wetland area (30 years, Brière, northwest France). Despite the small spatial scale of our study (15 km2), populations were highly structured according to the strong barrier of land surfaces and revealed a clear pattern of colonization through watercourses. Isolated populations exhibited small effective sizes and low dispersal rates that depended on water connectivity, suggesting that genetic drift dominated in the evolution of allele frequencies in these populations. We also observed a significant decrease in the genetic diversity of isolated populations over only a 2‐year period, but failed to demonstrate an associated fitness cost using fluctuating asymmetry. This study documents the possible strong influence of genetic drift during the spread of a species, and such findings provide critical insights into the current context of profound rearrangements in species distributions due to global change.

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“…Genetic differentiation of invasive species may be related to different source populations, bottlenecks, genetic drift and/or rapid adaptive evolution (Bertelsmeier & Keller, 2018; Cao et al, 2017; Dlugosch & Parker, 2010). Based on the demographic analysis, the population differentiation in the invasive species was mainly caused by evolutionary processes in China rather than involving different sources of introduced populations.…”

Section: Discussionmentioning

confidence: 99%

Rapid and strong population genetic differentiation and genomic signatures of climatic adaptation in an invasive mealybug

Cao

Hoffmann

et al. 2020

Diversity and Distributions

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Aim A growing number of studies suggest that adaptation of invasive species plays key roles in their successful establishment in novel environments. However, adaptation of invasive species to climatic conditions remains poorly characterized. This study aimed to understand the population genetic structure produced by the cotton mealybug Phenacoccus solenopsis invasion and to identify preliminary signals of selection during its range expansion. Location China. Methods We examined genetic structure of 11 populations across China using SNPs, microsatellites and a segment of mitochondrial cox1 gene. ADMIXTURE, STRUCTURE and DAPC were used to infer population genetic structure; the dispersal routes were reconstructed by the DIYABC; SNPs potentially related to climate adaptation were identified by using four populations differentiation methods and three environmental association methods. Results Strong genetic differentiation was found among populations with FST values ranging from 0.097 to 0.640 based on SNPs. Populations located at the northern expansion edge exhibited the highest genetic differentiation and the lowest genetic diversity. Demographic analyses indicated that all populations were introduced from a single source population with small effective size and low recent gene flow. RDA analysis showed that climatic variables explained a higher proportion of genetic variance (43%) compared to population structure variables (15%). The top climatic variables associated with genetic differentiation were precipitation of the mean temperature of warmest quarter, mean temperature of driest quarter and isothermality. Genes related to climate candidate SNPs were mainly enriched to pathways of development, energy and xenobiotic metabolisms. Main conclusions We found that extremely rapid and strong population genetic differentiation among populations appears to have developed after introduction in the cotton mealybug. Our study points to rapid neutral evolution and suggests possible climatic adaptation despite low genetic diversity in this invasive species.

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Bridgehead Effects and Role of Adaptive Evolution in Invasive Populations

Cited by 111 publications

References 43 publications

Behavioural variation and plasticity along an invasive ant introduction pathway

Behavioural variation and plasticity along an invasive ant introduction pathway

Genetic drift during the spread phase of a biological invasion

Rapid and strong population genetic differentiation and genomic signatures of climatic adaptation in an invasive mealybug

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