Journal Article

Seedling traits, plasticity and local differentiation as strategies of invasive species of <i>Impatiens</i> in central Europe

Hana Skálová, Vendula Havlíčková and Petr Pyšek

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 110, issue 7, pages 1429-1438
Published in print November 2012 | ISSN: 0305-7364
Published online January 2012 | e-ISSN: 1095-8290 | DOI: http://dx.doi.org/10.1093/aob/mcr316

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Background and Aims

Invasiveness of some alien plants is associated with their traits, plastic responses to environmental conditions and interpopulation differentiation. To obtain insights into the role of these processes in contributing to variation in performance, we compared congeneric species of Impatiens (Balsaminaceae) with different origin and invasion status that occur in central Europe.

Methods

Native I. noli-tangere and three alien species (highly invasive I. glandulifera, less invasive I. parviflora and potentially invasive I. capensis) were studied and their responses to simulated canopy shading and different nutrient and moisture levels were determined in terms of survival and seedling traits.

Key Results and Conclusions

Impatiens glandulifera produced high biomass in all the treatments and the control, exhibiting the ‘Jack-and-master’ strategy that makes it a strong competitor from germination onwards. The results suggest that plasticity and differentiation occurred in all the species tested and that along the continuum from plasticity to differentiation, the species at the plasticity end is the better invader. The most invasive species I. glandulifera appears to be highly plastic, whereas the other two less invasive species, I. parviflora and I. capensis, exhibited lower plasticity but rather strong population differentiation. The invasive Impatiens species were taller and exhibited higher plasticity and differentiation than native I. noli-tangere. This suggests that even within one genus, the relative importance of the phenomena contributing to invasiveness appears to be species'specific.

Keywords: Alien species; congeners; plant traits; population differentiation; non-native plants

Journal Article.  6654 words.  Illustrated.

Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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