Heracleum Mantegazzianum Sommier &amp; Levier

Tiley, G. E. D.; Dodd, F. S.; Wade, P. M.

doi:10.2307/2261365

Cited by 77 publications

(79 citation statements)

References 18 publications

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“…It invades mesic grasslands, waste ground, riverbanks, roadsides and forest edges where it forms tall-herb stands (Tiley et al 1996, Pyšek et al 2007.…”

Section: Study Species and Field Datamentioning

confidence: 99%

Impact scores of invasive plants are biased by disregard of environmental co-variation and non-linearity

Thiele¹,

Isermann²,

Kollmann³

et al. 2011

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Prioritisation of high-impact species is becoming increasingly important for management of introduced species ('neobiota') because of their growing number of which, however, only a small fraction has substantial impacts. Impact scores for prioritising species may be affected by the type of effect model used. Recent studies have shown that environmental co-variation and non-linearity may be significant for effect models of biological invasions. Here, we test for differences in impact scores between simple and complex effect models of three invasive plant species (Heracleum mantegazzianum, Lupinus polyphyllus, Rosa rugosa).We investigated the effects of cover percentages of the invasive plants on species richness of invaded communities using both simple linear effect models ('basic models') and more complex linear or nonlinear models including environmental co-factors ('full models'). Then, we calculated impact scores for each invasive species as the average reduction of species richness predicted by basic and full effect models.All three non-native species had negative effects on species richness, but the full effect models also indicated significant influence of habitat types. Heracleum mantegazzianum had uniform linear effects in all habitats, while effects of L. polyphyllus interacted strongly with habitat type, and R. rugosa showed a marked non-linear relationship. Impact scores were overestimated by basic effect models for H. mantegazzianum and R. rugosa due to disregard of habitat effects and non-linearity, respectively. In contrast, impact of L. polyphyllus was underestimated by the basic model that did not account for the strong interaction of invader cover and habitat type.We conclude that simple linear models will often yield inaccurate impact scores of non-native species. Hence, effect models should consider environmental co-variation and, if necessary, non-linearity of the effects of biological invasions on native ecosystems.

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“…It invades mesic grasslands, waste ground, riverbanks, roadsides and forest edges where it forms tall-herb stands (Tiley et al 1996, Pyšek et al 2007.…”

Section: Study Species and Field Datamentioning

confidence: 99%

Impact scores of invasive plants are biased by disregard of environmental co-variation and non-linearity

Thiele¹,

Isermann²,

Kollmann³

et al. 2011

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“…In its invaded range, H. mantegazzianum is a problem species, because it forms stands with a high cover, replaces resident vegetation, and produces photosensitive sap that is toxic for humans (Tiley et al 1996). The rapid invasion of this species in Europe was encouraged by its planting as a garden ornamental.…”

Section: Study Speciesmentioning

confidence: 99%

“…It is a monocarpic perennial, which usually flowers in the third year; the lifespan, however, depends on habitat conditions and can be extended to more than 10 years (Pergl et al 2006a). White flowers are arranged in compound umbels with a terminal umbel of up to 80 cm in diameter (Tiley et al 1996). In the study area the plants flower from late June to late July (Mü llerová et al 2005) and a single plant can produce on average 20,500 fruits with a maximum of 46,500 (Perglová et al 2006).…”

Section: Study Speciesmentioning

confidence: 99%

“…The increase in leaf number followed probabilities derived from empirical values (see Nehrbass et al 2006 for details) and changes in the length of the largest leaf followed rules that depended on the number of leaves. As a monocarpic perennial plant H. mantegazzianum flowers at earliest in its second year (Tiley et al 1996;Holub 1997;Pergl et al 2006a), the model thus considered plants 2 years and older as capable of flowering. Flowering probability was not only age-dependent, but also determined by a combination of two size attributes, i.e., the number of leaves and the length of the largest leaf.…”

Section: Life History Of Plantsmentioning

confidence: 99%

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A simulation model of plant invasion: long-distance dispersal determines the pattern of spread

et al. 2006

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Mechanisms and consequences of biological invasions are a global issue. Yet, one of the key aspects, the initial phase of invasion, is rarely observed in detail. Data from aerial photographs covering the spread of Heracleum mantegazzianum (Apiaceae, native to Caucasus) on a local scale of hectares in the Czech Republic from the beginning of invasion were used as an input for an individual-based model (IBM), based on small-scale and short-time data. To capture the population development inferred from the photographs, long-distance seed dispersal, changes in landscape structures and suitability of landscape elements to invasion by H. mantegazzianum were implemented in the model. The model was used to address (1) the role of long-distance dispersal in regional invasion dynamics, and (2) the effect of land-use changes on the progress of the invasion. Simulations showed that already small fractions of seed subjected to long-distance dispersal, as determined by systematic comparison of field data and modelling results, had an overproportional effect on the spread of this species. The effect of land-use changes on the simulated course of invasion depends on the actual level of habitat saturation; it is larger for populations covering a high proportion of available habitat area than for those in the initial phase of invasion.Our results indicate how empirical field data and model outputs can be linked more closely with each other to improve the understanding of invasion dynamics. The multi-level, but nevertheless simple structure of our model suggests that it can be used for studying the spread of similar species invading in comparable landscapes.

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“…et Lev. (Pyšek 1991;Tiley et al 1996), a giant Hogweed native to the North-western Great Caucasus is successfully introduced in large parts of Europe during the last decades (e.g. Mü llerová et al 2005;Nielsen et al 2005) and occurs as both open stands and dense (dominant) stands in a range of different habitats (Tiley et al 1996;Thiele and Otte 2006).…”

Section: Introductionmentioning

confidence: 99%

Population life-cycle and stand structure in dense and open stands of the introduced tall herb Heracleum mantegazzianum

2007

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Populations of the introduced Heracleum mantegazzianum consist of dense central stands, which gradually give way to open stands towards the margins. To analyse whether open stands are due to unsuitable conditions or represent the invading front for further spread, we studied life-cycle, population dynamics, stand structure and soil conditions of open and dense stands over two transition periods. Populations decreased during the first interval but increased after the extremely dry and warm summer of 2003 during the second interval. Open stands had shorter generation times, lower height, smaller proportions of small individuals and were less in equilibrium with the environment than dense stands. In open stands, growth to higher stages was most important, while in dense stands delayed development (self-loops) had a strong effect on population growth; stasis and fecundity contributed most to the difference in k between stand types. By petiole extension H. mantegazzianum may raise its leaves just above the resident vegetation. Therefore, younger stages develop faster in open stands, whereas strong competition by conspecific adults leads to longer generation times and a higher proportion of small individuals in dense stands. Disturbance due to extreme climatic conditions in summer 2003 equalised population dynamics of both stand types. Lifecycle variation between stand types makes it difficult to infer simple management rules. However, our data suggest that small and/or open stands of H. mantegazzianum may eventually serve as initials for further spread after land-use changes, whereas dense stands are stable and may represent sources of propagules.

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Heracleum Mantegazzianum Sommier & Levier

Cited by 77 publications

References 18 publications

Impact scores of invasive plants are biased by disregard of environmental co-variation and non-linearity

Impact scores of invasive plants are biased by disregard of environmental co-variation and non-linearity

A simulation model of plant invasion: long-distance dispersal determines the pattern of spread

Population life-cycle and stand structure in dense and open stands of the introduced tall herb Heracleum mantegazzianum

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