Could knotweeds invade mountains in their introduced range? An analysis of patches dynamics along an elevational gradient

Martin, François-Marie; Dommanget, Fanny; Janssen, Philippe; Spiegelberger, Thomas; Viguier, Clément; Evette, André

doi:10.1007/s00035-018-0214-5

Cited by 6 publications

(8 citation statements)

References 58 publications

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“…This observation gives a quantitative explanation to empirical and modelling studies indicating that low mowing frequency and/or partial mowing have close to no effects on the cover or expansion dynamics of R. japonica (Gerber et al 2010;Lavallée et al 2019;Martin et al 2019).…”

Section: Establishment Potential and Management Implicationsmentioning

confidence: 56%

“…Stands of R. japonica frequently grow in habitats that do not experience full sun, or are mowed, such as roadsides, semi-natural riverbanks or forest edges (Beerling et al 1994;Martin et al 2019;Tiébré et al 2008). In those, we may expect clones to adopt tactics to cope with or to avoid the effect of less favorable areas.…”

Section: Clonal Growth Forms and Strategiesmentioning

confidence: 99%

“…whole connected clones or parts of clones growing in full light or under a closed canopy, and being mowed or not. For instance, some authors report that shaded clones usually display a lower ramet density than the ones growing in open areas (Dommanget et al 2019;Martin et al 2019) or that, conversely, mowing increases ramet density and favors stands' expansion (Beerling 1990;Child and Wade 2000).…”

Section: Introductionmentioning

confidence: 99%

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Clonal growth strategies of Reynoutria japonica in response to light, shade, and mowing, and perspectives for management

Martin¹,

Dommanget²,

Lavallée³

et al. 2020

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Many of the most invasive plant species in the world can propagate clonally, suggesting clonality offers advantages that facilitate invasion. Gaining insights into the clonal growth dynamics of invasive plants should thus improve understanding of the mechanisms of their dominance, resilience and expansion. Belonging to the shortlist of the most problematic terrestrial invaders, Reynoutria japonica var. japonica Houtt. (Japanese knotweed) has colonized all five continents, likely facilitated by its impressive ability to propagate vegetatively. However, its clonal growth patterns are surprisingly understudied; we still do not know how individuals respond to key environmental conditions, including light availability and disturbance. To contribute to filling this knowledge gap, we designed a mesocosm experiment to observe the morphological variation in R. japonica growth in homogeneous or heterogeneous conditions of light stress (shade) and disturbance (mowing). Rhizome fragments were planted in the middle of large pots between two habitat patches that consisted of either one or a combination of the following three environmental conditions: full light without mowing, full light with frequent mowing, or shade without mowing. At the end of the experiment, biomass and traits related to clonal growth (spacer and rhizome lengths, number of rhizome branches, and number of ramets) were measured. After 14 months, all individuals had survived, even those frequently mowed or growing under heavy shade. We showed that R. japonica adopts a ‘phalanx’ growth form when growing in full light and a ‘guerrilla’ form when entirely shaded. The former is characteristic of a space-occupancy strategy while the latter is more associated with a foraging strategy. In heterogeneous conditions, we also showed that clones seemed to invest preferentially more in favorable habitat patches rather than in unfavorable ones (mowed or shaded), possibly exhibiting an escape strategy. These observations could improve the management of this species, specifically by illustrating how aggressive early control measures must be, by highlighting the importance of repeated mowing of entire stands, as this plant appears to compensate readily to partial mowing, and by informing on its potential responses towards the restoration of a cover of competitive native plants.

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Section: Establishment Potential and Management Implicationsmentioning

confidence: 56%

Section: Clonal Growth Forms and Strategiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Clonal growth strategies of Reynoutria japonica in response to light, shade, and mowing, and perspectives for management

Martin¹,

Dommanget²,

Lavallée³

et al. 2020

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“…Adding this phenomenon could produce simulation results closer to reality. The field data we have used for the calibration were extracted from Martin et al (2018). The measurements were carried out in 2008 and 2015 on stands that were mown or not.…”

Section: Discussionmentioning

confidence: 99%

“…When we consider a set of parameters for the plant, and perform a simulation for each of the 19 stands, we obtain 19 × 4 results (real numbers): the areas and sizes of the initial and final populations. We can thus compare these values with the 19 × 4 corresponding observations of Martin et al (2018). The goal is to find a set of parameters for the plant, common to all stands, that best matches the model outputs (area and size) to field observations.…”

Section: The Methods Used For the Calibrationmentioning

confidence: 99%

A stochastic individual-based model for the growth of a stand of Japanese knotweed including mowing as a management technique

Lavallée¹,

Smadi²,

Alvarez³

et al. 2019

Ecological Modelling

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Invasive alien species are a growing threat for environment and health. They also have a major economic impact, as they can damage many infrastructures. The Japanese knotweed (Fallopia japonica), present in North America, Northern and Central Europe as well as in Australia and New Zealand, is listed by the World Conservation Union as one of the world's worst invasive species. So far, most models have dealt with how the invasion spreads without management. This paper aims at providing a model able to study and predict the dynamics of a stand of Japanese knotweed taking into account mowing as a management technique. The model we propose is stochastic and individual-based, which allows us taking into account the behaviour of individuals depending on their size and location, as well as individual stochasticity. We set plant dynamics parameters thanks to a calibration with field data, and study the influence of the initial population size, the mean number of mowing events a year and the management project duration on mean area and mean number of crowns of stands. In particular, our results provide the sets of parameters for which it is possible to obtain the stand eradication, and the minimal duration of the management project necessary to achieve this latter.

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Forest disturbances promote invasion of alien herbaceous plants: a comparison of abundance and plant traits between alien and native species in thinned and unthinned stands

Oshima

Takahashi

2020

Biol Invasions

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Could knotweeds invade mountains in their introduced range? An analysis of patches dynamics along an elevational gradient

Cited by 6 publications

References 58 publications

Clonal growth strategies of Reynoutria japonica in response to light, shade, and mowing, and perspectives for management

Clonal growth strategies of Reynoutria japonica in response to light, shade, and mowing, and perspectives for management

A stochastic individual-based model for the growth of a stand of Japanese knotweed including mowing as a management technique

Forest disturbances promote invasion of alien herbaceous plants: a comparison of abundance and plant traits between alien and native species in thinned and unthinned stands

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