The role of evolution in the invasion process

Novak, Stephen J.

doi:10.1073/pnas.0700224104

Cited by 139 publications

(119 citation statements)

References 16 publications

Supporting

Mentioning

114

Contrasting

Unclassified

Order By: Relevance

“…Limited founder effects were detected in the colonist population as reduced number of alleles, private alleles and heterozygosity compared to the source population. Population bottlenecks are suggested to be a common feature of colonisation events, leading to reduced or modified genetic diversity compared to the source or native population (Tsutsui et al 2000;Sakai et al 2001;Novak 2007;Dlugosch and Parker 2008). A high propagule pressure (i.e., a large size of the founder population or a high number of consecutive founder events) will however reduce or eliminate founder effects (Lockwood et al 2005;Novak 2007;Roman and Darling 2007).…”

Section: Discussionmentioning

confidence: 99%

Invader population speeds up life history during colonization

Amundsen

Salonen²,

Niva³

et al. 2012

Biol Invasions

View full text Add to dashboard Cite

We explore the long-term developments in population biology and life history during the invasion and establishment of the fish species vendace Coregonus albula in a subarctic watercourse by comparing life-history traits and molecular genetic estimates between the source and the colonist population. The two populations exhibited highly contrasting lifehistory strategies. Relative to the source population, the colonist population was characterized by slower somatic growth rates, earlier sexual maturation at smaller individual size, higher mortality rates and a shorter life span. The two populations could also be significantly discriminated by the genetic markers.Limited founder effects were detected from heterozygote deficit and reduced allelic richness in the colonist population, but both populations were associated with relatively high genetic diversity. The study reveals that the invasion into a new environment induced large changes in life-history strategy, with typical r-selected traits being more prominent in the colonist than in the source population. We discuss the mechanisms that may explain the observed life-history differences between the source and the colonist population, and argue that the accelerated life history of the colonist population represents an adaptive pioneer strategy aimed at fast population increase during colonization and establishment.

show abstract

Section: Discussionmentioning

confidence: 99%

Invader population speeds up life history during colonization

Amundsen

Salonen²,

Niva³

et al. 2012

Biol Invasions

View full text Add to dashboard Cite

show abstract

“…In fungal plant pathogens, several examples of multiple introductions have been reported (for example Stukenbrock et al, 2006;Delmotte et al, 2008;Goss et al, 2009), but successful invasions would have also occurred from single clonal lineages (for example Goodwin et al, 1994;Engelbrecht et al, 2004;Raboin et al, 2007). Finally, the number of studies clearly documenting the history of introduction (that is number of introductions, introduced genetic diversity and evolutionary processes) is too low to evaluate the statement: 'multiple introductions is the rule rather than the exception' as has been proposed for plant species (Novak, 2007).…”

Section: Introductionmentioning

confidence: 95%

“…In plant invasive species for which evolutionary processes have been intensively studied, multiple introductions could be critical for establishment in the areas of introduction (Novak, 2007;Dlugosch and Parker, 2008). In particular, multiple introductions may favour admixture of genetic pools from original genetically differentiated populations and allow the emergence of new genotypes that may be well adapted to the new habitat (for example Facon et al, 2005;Lavergne and Molofsky, 2007).…”

Section: Introductionmentioning

confidence: 99%

Multiple introductions of divergent genetic lineages in an invasive fungal pathogen, Cryphonectria parasitica, in France

et al. 2009

View full text Add to dashboard Cite

“…The experimental conditions in sunflower cages isolated from exterior environment (Sakr, 2011b;Tourvieille de Labrouhe et al, 2010) excluded the introduction of new races. The potential of P. halstedii to evolve new races has also been enhanced by the introduction of several genetically differentiated genotypes: repeated introductions of P. halstedii isolates, combined with the selective pressure exerted by host resistance genes, may have greatly accelerated the evolution of new races (Novak, 2007;Sakr, 2014aSakr, , 2014b. To improve our knowledgee on the emergence of new virulence of sunflower downy mildew populations, it is necessary to obtain genetic structure data for all the recorded races and to include different geographical isolates for each race.…”

Section: Resultsmentioning

confidence: 99%

Emergence of new virulence in Plasmopara halstedii (sunflower downy mildew)

Sakr¹

2015

Acta Phytopathologica et Entomologica Hungarica

View full text Add to dashboard Cite

The fast evolution of Plasmopara halstedii (downy mildew) remains a major risk for sunflower crop, as new races of the pathogen are bypassing the resistance of sunflower hybrids. In order to understand the processes which led a new virulence to appear in a local P. halstedii population, the genetic relationships were studied using 12 EST (Expressed Sequence Tag)-derived markers between five progeny isolates of races 300, 304, 314, 704 and 714 and two parental ones of races 100 and 710. All genetic analyses were carried out using five single zoosporangium isolates per P. halstedii isolate. There was no intra-isolate genetic variation among the seven pathogen isolates and five multilocus genotypes (MLG) were identified among the 35 P. halstedii single zoosporangium isolates. The single zoosporangium isolates of races 314, 704 and 714 had an intermediary genetic position between the single zoosporangium isolates of two parental isolates. The single zoosporangium isolates of three isolates of races 100, 300 and 304 were localized in the same genetic clade. Two genetic mechanisms could explain the emergence of new virulence in P. halstedii as a recombination between races and mutations in a clonal lineage.

show abstract

The role of evolution in the invasion process

Cited by 139 publications

References 16 publications

Invader population speeds up life history during colonization

Invader population speeds up life history during colonization

Multiple introductions of divergent genetic lineages in an invasive fungal pathogen, Cryphonectria parasitica, in France

Emergence of new virulence in Plasmopara halstedii (sunflower downy mildew)

Contact Info

Product

Resources

About