Novel Weapons: Invasive Success and the Evolution of Increased Competitive Ability

Callaway, Ragan M.; Ridenour, Wendy M.

doi:10.2307/3868432

Cited by 468 publications

(679 citation statements)

References 15 publications

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“…Previous studies on related Rorippa species (Yamane et al 1992a;Yamane et al 1992b) revealed a negative effect on the growth of other plant species as a consequence of production of root exudates and suggested possible allelopathic effects. However, allelopathic effects are usually reported for exotic species when such effects facilitate the invasion of exotics in the new range; the so called Novel Weapons Hypothesis (Callaway and Ridenour 2004;Thorpe et al 2009;Barto et al 2010). Here, we show that native R. austriaca also negatively affects the growth of a cooccurring species.…”

Section: Discussionmentioning

confidence: 99%

“…Differences in the intensity of plant-soil feedback between the native and invasive range could be caused by micro evolutionary changes leading to a change in a range of species traits (Bone and Farres 2001;Maron et al 2004;Callaway and Ridenour 2004;Bossdorf et al 2005). Most plant-soil feedback studies have focused on the impact of the soil biota on the invasive and related non-invasive plant species in the non-native range.…”

Section: Introductionmentioning

confidence: 99%

“…They can also reduce local mycorrhizal fungi with negative consequences for native plant species (Stinson et al 2006;Lankau and Strauss 2007;). In addition, plants can produce secondary metabolites such as allelopathic root exudates that are relatively ineffective against their natural neighbours because of adaptation but may be highly inhibitory to newly encountered plants in the invaded communities (Callaway and Ridenour 2004).…”

Section: Introductionmentioning

confidence: 99%

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Plant–soil feedback in native vs. invasive populations of a range expanding plant

et al. 2015

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Background and aims Although plant-soil feedback has been suggested as a mechanism that drives the success of invasive plants, studies that investigate differences in the intensity of plant-soil feedback among native and invasive populations of the same species are still lacking. However, such knowledge is important because it can provide an understanding of the mechanisms responsible for the spread of a species. Rorippa austriaca is a potentially invasive species -a successful range expander in Europe.Methods We compared the plant-soil feedback of R. austriaca in populations from its native and invasive range. We explored both intraspecific feedback as well as feedback on a co-occurring grass species. Results Our results revealed a strong negative feedback effect as a consequence of soil conditioning by R. austriaca from the native range. On the contrary, a negative feedback effect was not observed for invasive R. austriaca. Interestingly, R. austriaca from the invasive range had a higher biomass than native R. austriaca. Conclusion Our results might be explained by pathogen accumulation and soil modification by native R. austriaca, which had strong intra-and interspecific effects that seemed to be lost in the invasive R. austriaca. The loss of negative intraspecific plantsoil feedback and the increased growth of the invasive population may contribute to its successful range expansion. In spite of its increased growth, the co-occurring grass species is expected to successfully coexist with the invasive R. austriaca.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Plant–soil feedback in native vs. invasive populations of a range expanding plant

et al. 2015

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“…4) Novel weapons hypothesis: in the exotic habitat, invasive species can have a competitive advantage against native species because they possess a novel weapon, i.e. a trait that is new to the resident community of native species and therefore affects them negatively (Callaway and Aschehoug 2000;Callaway and Ridenour 2004). Prime examples of novel weapons are plant biochemicals with allelopathic effects, but traits of other organisms can be considered as novel weapons as well, e.g.…”

mentioning

confidence: 99%

Support for major hypotheses in invasion biology is uneven and declining

Jeschke¹,

Aparicio²,

Haider³

et al. 2012

311

277

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Several major hypotheses have been proposed to explain and predict biological invasions, but the general applicability of these hypotheses is largely unknown, as most of them have not been evaluated using a standard approach across taxonomic groups and habitats. We offer such an evaluation for six selected leading hypotheses. Our global literature review reveals that those hypotheses that consider interactions of exotic invaders with their new environment (invasional meltdown, novel weapons, enemy release) are better supported by empirical evidence than other hypotheses (biotic resistance, island susceptibility, tens rule). We also show that empirical support for the six hypotheses has declined over time, and that support differs among taxonomic groups and habitats. Our results have implications for basic and applied research, policy making, and invasive species management, as their effectiveness depends on sound hypotheses

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“…Secondary metabolites have obtained some attention as they were proposed to act as chemical weapons for invasive plants. 19 They may also function as siderophores that facilitate the uptake of iron and other transition metals. 20 The improved micronutrient uptake then contributes to improved performance of the plant.…”

Section: Iron Chelators As Siderophoresmentioning

confidence: 99%

Iron and its complexation by phenolic cellular metabolites

Chobot

Hadaček

2010

Plant Signaling & Behavior

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Iron is a transition metal that forms chelates and complexes with various organic compounds, also with phenolic plant secondary metabolites. The ligands of iron affect the redox potential of iron. Electrons may be transferred either to hydroxyl radicals, hydrogen peroxide or molecular oxygen. In the first case, oxidative stress is decreased, in the latter two cases, oxidative stress is increased. This milieu-dependent mode of action may explain the non-linear mode of action of juglone and other secondary metabolites. Attention to this phenomenon may help to explain idiosyncratic and often nonlinear effects that result in biological assays. Current chemical assays are discussed that help to explore these aspects of redox chemistry.

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Novel Weapons: Invasive Success and the Evolution of Increased Competitive Ability

Cited by 468 publications

References 15 publications

Plant–soil feedback in native vs. invasive populations of a range expanding plant

Plant–soil feedback in native vs. invasive populations of a range expanding plant

Support for major hypotheses in invasion biology is uneven and declining

Iron and its complexation by phenolic cellular metabolites

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