Hybridization increases invasive knotweed success

Parepa, Madalin; Fischer, Markus; Krebs, Christine; Bossdorf, Oliver

doi:10.1111/eva.12139

Cited by 70 publications

(74 citation statements)

References 67 publications

(128 reference statements)

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“…3). Also, the lowest number of significantly associated species for F. ×bohemica sites can in part confirm the observations of Parepa et al [30]. As far as the resident species is concerned, some studies have shown that one of the most frequent accompanying species to Fallopia spp.…”

Section: Impact Of Fallopia Complex Members On Resident Plant Speciessupporting

confidence: 87%

“…Nevertheless, it is apparent that the three Fallopia taxa influence the co-occurring plant composition in a different way or that the effect can be manifested at a different time in relation to the history of invasion. 30 plots. This is a relatively small number of species, especially in habitats as species-rich as riparian zones.…”

Section: Impact Of Fallopia Complex Members On Resident Plant Speciesmentioning

confidence: 99%

“…This is a probably consequence of the relatively long residence time of knotweeds in the sites studied in the present investigation. According to Parepa et al [30] in the initial phase of invasion, i.e. knotweed establishment, shading is the most crucial factor in the exclusion of resident species, but in later stages of invasion allelopathy might play a major role.…”

Section: Impact Of Fallopia Complex Members On Resident Plant Speciesmentioning

confidence: 99%

“…Hybrid F. ×bohemica was proven to spread faster, and this is also possibly due to its genetic diversity. A study using experimental communities of native plants and Fallopia taxa revealed that the hybrid performed significantly better than the parental species [30]. Some studies on other species showed that hybrids can be more plastic and more tolerant to environmental conditions [31].…”

Section: Introductionmentioning

confidence: 99%

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The influence of invasive Fallopia taxa on resident plant species in two river valleys (southern Poland)

et al. 2015

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Riparian zones in two rivers in southern Poland were studied in terms of species composition and soil parameters in patches dominated by three knotweed taxa (Fallopia japonica, F. sachalinensis and the hybrid F. ×bohemica). The main purpose was to detect any differences in species diversity, environmental conditions and in the impact of the three Fallopia spp. on resident species. Fieldwork was conducted in spring and summer in 30 invaded plots (in total 90 subplots). It was demonstrated that vegetation dominated by particular knotweed taxa differed in response to soil pH and ammonium, nitrate, and magnesium content. Fallopia spp. (living plants and necromass) had a stronger negative impact on the cover and species diversity of the resident species in summer in comparison with spring. Vegetation patches differed significantly in species composition in relation to the knotweed taxa present. These differences may be the consequence of the differentiated biotopic requirements of Fallopia taxa and the coexisting plants, or to the different impact of the knotweed taxa on the resident species.

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Section: Impact Of Fallopia Complex Members On Resident Plant Speciessupporting

confidence: 87%

Section: Impact Of Fallopia Complex Members On Resident Plant Speciesmentioning

confidence: 99%

Section: Impact Of Fallopia Complex Members On Resident Plant Speciesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The influence of invasive Fallopia taxa on resident plant species in two river valleys (southern Poland)

et al. 2015

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“…However, no general patterns have been found and the topic is contrarily discussed (e.g. [37] [58] [59]). …”

Section: Discussionmentioning

confidence: 99%

Reduction of Native Diversity by Invasive Plants Depends on Habitat Conditions

Künzi¹,

Prati²,

Fischer³

et al. 2015

AJPS

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Invasions by exotic plant species and their impacts on invaded communities are a highly topical field of research because it provides a basis for the management of neophyte populations. However, for many invasive neophyte species in Central Europe little is known about their impacts on invaded plant communities. Moreover, it has hardly been considered whether effects vary among habitat conditions. Here, we selected each ten sites with different habitat conditions invaded by Erigeron annuus, Fallopia japonica, Impatiens glandulifera and Solidago canadensis which were listed as invasive in Switzerland. At each site, we established four 4 m × 1 m subplots covering a gradient from very low to very high cover of the particular neophyte species to investigate the effect of increasing neophyte cover on the species richness, Shannon diversity and evenness of the invaded plant communities. Moreover, we measured soil pH and characterized habitat conditions using Ellenberg indicator values to light and soil fertility. Whereas increasing cover of I. glandulifera had no effect on the diversity of invaded plant communities, an increasing cover of E. annuus negatively affected Shannon diversity. An increasing cover of F. japonica combined with a decreasing soil pH negatively affected the Shannon diversity of invaded plant communities. Similarly, an increasing cover of S. canadensis in combination with decreasing soil fertility negatively affected the Shannon diversity and evenness of invaded communities. Our results indicate that significant effects of increasing neophyte cover are mostly coupled to particular habitat conditions and then rather suppress than eliminate native plant species in invaded communities. We therefore suggest including abiotic variables in further impact studies on biotic invasions. Furthermore, adapting measures to the respective environmental context can be a useful tool in priority setting for the management of invasive neophyte populations and the restoration of invaded habitats.

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Trait Evolution in Invasive Species

Hodgins

Bock

2018

Annual Plant Reviews Online

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One of the most exciting recent developments in the field of invasion biology has been the growing realisation that evolution can determine invasive species' success. Here, we review research on contemporary evolution in invasive populations, with a focus on traits that have the potential to contribute to invasive spread. Evidence available so far indicates adaptive divergence in quantitative traits predominates, although the contribution of non‐adaptive processes should not be easily discounted. Further, contemporary evolution of invasive populations appears to be more frequently spurred by abiotic factors, rather than escape from natural enemies. Important progress remains to be made on the role of hybridisation in invasion success, or the conditions under which rapid evolution of phenotypic plasticity at key traits leads to invasions. Also, we do not yet have a firm grasp on how often expansion load limits invasive spread. While convincing examples of adaptation along geographic or climatic gradients are available, we highlight conditions under which such clines would arise irrespective of biotic or abiotic conditions. We propose potentially important future lines of investigation that can illuminate the mechanistic basis of invasion success while maximising the value of invasive species for understanding evolutionary processes.

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Hybridization increases invasive knotweed success

Cited by 70 publications

References 67 publications

The influence of invasive Fallopia taxa on resident plant species in two river valleys (southern Poland)

The influence of invasive Fallopia taxa on resident plant species in two river valleys (southern Poland)

Reduction of Native Diversity by Invasive Plants Depends on Habitat Conditions

Trait Evolution in Invasive Species

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