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A synthesis of plant invasion effects on biodiversity across spatial scaes / Kristin I Powell in American Journal of Botany, 98 (3) (2011) 

Public Citation [article]  inAmerican Journal of Botany > 98 (3) (2011) . - 539-548 Titre : A synthesis of plant invasion effects on biodiversity across spatial scaes Type de document : Électronique Auteurs : Kristin I Powell ; Jonathan M Chase ; Tiffany M. Knight Année de publication : 2011 Article en page(s) : 539-548 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Plantes subspontanées, naturalisées, envahissantes Résumé : Premise of the study: Invasive plant species are typically thought to pose a large threat to native biodiversity, and local-scale studies typically confirm this view. However, plant invaders rarely cause regional extirpations or global extinctions, causing some to suggest that invasive species’ influence on native biodiversity may not be so dire. We aim to synthesize the seemingly conflicting literature in plant invasion biology by evaluating the effects of invasive plant species across spatial scales. Methods: We first conducted a meta-analysis on the effects of invasive plants on the species richness of invaded communities across a range of spatial extents. We then discuss studies that consider the role of invasive plants on regional spatial scales for which such meta-analyses are not possible. Finally, we develop a conceptual framework to synthesize the influence of invasive species across spatial scales by explicitly recognizing how invasive species alter species-occupancy distributions. Key results: We found a negative relationship between the spatial extent of the study and the effect size of invasive plants on species richness. Our simulation models suggest that this result can occur if invaders, either proportionately or disproportionately, reduce the occupancy of common species to a greater degree than rare species. Conclusions: Future studies should consider the influence of invaders on the abundance and occupancy-level changes in native species to inform how invasive plants will influence native species richness relationships across spatial scales. This approach will allow greater predictive ability for forecasting changes in biodiversity in the face of anthropogenic biological invasions and will inform invasive species management and restoration. Lien pérenne : DOI : 10.3732/ajb.1000402 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=142776 Powell, Kristin I, Chase, Jonathan M, Knight, Tiffany M. 2011 A synthesis of plant invasion effects on biodiversity across spatial scaes. American Journal of Botany, 98(3): 539-548.

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Will the use of less fecund cultivars reduce the invasiveness of perennial plants ? / Tiffany M. Knight in BioScience, 61 (10) (10/2011) 

Public Citation [article]  inBioScience > 61 (10) (10/2011) . - 816-822 Titre : Will the use of less fecund cultivars reduce the invasiveness of perennial plants ? Type de document : Électronique Auteurs : Tiffany M. Knight ; Kayri Havens ; Pati Vitt Année de publication : 2011 Article en page(s) : 816-822 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Plantes subspontanées, naturalisées, envahissantes [CBNPMP-Thématique] Cultivars, descriptions variétales, essais variétaux, catalogues, types de variétés, identification variétale Résumé : Many invasive species were originally introduced for horticultural purposes, and several continue to be profitable for the green (nursery, horticulture, and landscape) industry. Recently, some plant suppliers have marketed less fecund cultivars of several invasive species, including glossy buckthorn (Frangula alnus), burning bush (Euonymus alatus), and Japanese barberry (Berberis thunbergii), as “safe” alternatives to invasive relatives. We use published matrix population models to simulate the effect of reducing fecundity on the population growth rates of invasive species. We show that large changes in fecundity result in relatively small changes to the population growth rates of long-lived species, which suggests that less fecund cultivars may still provide an invasive threat. Furthermore, many cultivars are clonal selections, and if crossed with other cultivars or selfed, they produce offspring with traits and fecundities that do not resemble the parent plant. On the basis of these two lines of evidence, we suggest that only female sterile cultivars that cannot reproduce asexually should be considered “safe” and noninvasive. Marketing less fecund cultivars as “safe” is premature at this time, and further research is necessary to determine the potential invasiveness of different cultivars. Lien pérenne : DOI : 10.1525/bio.2011.61.10.11 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=141913 Knight, Tiffany M., Havens, Kayri, Vitt, Pati 2011 Will the use of less fecund cultivars reduce the invasiveness of perennial plants ? BioScience, 61(10): 816-822.

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Consultable article (2011) URL