Residence time and potential range: Crucial considerations in modelling plant invasions

Wilson, John R.; Richardson, D.M.; Procheş, Şerban; Amis, Mao; Henderson, Lesley; Thuiller, Wilfried

doi:10.1016/j.sajb.2007.02.145

Cited by 119 publications

(185 citation statements)

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“…Thus, actual impact equates to Parker et al's metric of total impact I, while local impact is an estimate of AE. Local impact is a sensible measure for interspecific comparison, as in practice R is likely to be a function of a species' residence time in a region (Wilson et al 2007), while it will be hard to estimate the impact of individual invaders, and hence E, at least for animals. Moreover, per-capita impact E is likely strongly related to body size (Peters 1986) and therefore is on its own not a good indicator for interspecific comparison.…”

Section: Methodsmentioning

confidence: 99%

What determines the impact of alien birds and mammals in Europe?

2012

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An often-cited reason for studying the process of invasion by alien species is that the understanding sought can be used to mitigate the impacts of the invaders. Here, we present an analysis of the correlates of local impacts of established alien bird and mammal species in Europe, using a recently described metric to quantify impact. Large-bodied, habitat generalist bird and mammal species that are widespread in their native range, have the greatest impacts in their alien European ranges, supporting our hypothesis that surrogates for the breadth and the amount of resources a species uses are good indicators of its impact. However, not all surrogates are equally suitable. Impacts are generally greater for mammal species giving birth to larger litters, but in contrast are greater for bird species laying smaller clutches. There is no effect of diet breadth on impacts in birds or mammals. On average, mammals have higher impacts than birds. However, the relationships between impact and several traits show common slopes for birds and mammals, and relationships between impact and body mass and latitude do not differ between birds and mammals. These results may help to anticipate which species would have large impacts if introduced, and so direct efforts to prevent such introductions.

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Section: Methodsmentioning

confidence: 99%

What determines the impact of alien birds and mammals in Europe?

2012

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“…Residence time of exotics, usually quantified as time since a species was first recorded in its new range, is a well-documented variable influencing the degree to which potential distributional ranges are occupied (Wilson et al 2007;Wolmarans et al 2010;Pyšek et al 2011). An increase in exotic richness and ascending upper elevational limits might thus be attributed to recently introduced species still expanding their distributional ranges (Becker et al 2005).…”

Section: Residence Timementioning

confidence: 99%

“…Determining a year of introduction is notoriously complicated due to the absence or incompleteness of historical introduction records (Wilson et al 2007;le Roux et al 2013). This is especially true for unintentionally introduced species such as pests or inconspicuous weeds.…”

Section: Residence Timementioning

confidence: 99%

“…Such historical data, however, are often confounded by observer bias and sampling intensity (Wolmarans et al 2010;Kalwij et al 2014a) (Wilson et al 2007), even when considered at the spatial scale of an entire region or country. Consequently, the temporal precision and accuracy of minimum residence time of exotic species in southern Africa does not match that of our study design.…”

Section: Residence Timementioning

confidence: 99%

“…An underlying assumption of such studies is that species have already occupied their potential range, and that range expansion keeps pace with climate change. For exotic species, however, this assumption does not hold since many are still in the process of colonizing their potential niche (Wilson et al 2007). In addition, the rate at which a potential niche becomes occupied depends on a range of indirectly measured or reconstructed variables, such as residence time and propagule pressure (Becker et al 2005;Pyšek et al 2010;Pyšek et al 2011;le Roux et al 2013).…”

Section: Introductionmentioning

confidence: 99%

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Annual monitoring reveals rapid upward movement of exotic plants in a montane ecosystem

2015

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There is increasing evidence that invasive species are threating montane ecosystems globally.However, trends in species distribution are difficult to observe directly due to a lack of data with suitable spatio-temporal resolution. Here, we aimed to detect spatio-temporal trends in exotic 1 Kalwij, J.M. et al.plants in a montane ecosystem, and to determine which drivers had a role affecting these trends.Each year, for a period of seven years, we recorded the upper elevational range limit of exotic plant species in road verges along an elevational gradient of 1,500-2,874 m a.s.l. in southern Africa. We fitted repeated-measures ANOVA models to test if upper elevational range limits changed over time. Generalized least squares models showed that exotic richness of annuals increased by 3.9 species per year. Also, the upper elevational range limits of established exotics ascended by 24.5 m/y for annuals (N = 17 species), and by 9.7 m/y for perennials (N = 26).These upward trends were too rapid to be explained by slow-acting drivers such as climatic

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