Many alien plants are thought to be invasive because of unique traits and greater phenotypic plasticity relative to resident species. However, many studies of invasive species are unable to quantify the importance of particular traits and phenotypic plasticity in conferring invasive behavior because traits used in comparative studies are often measured in a single environment and by using plants from a single population. To obtain a deeper insight into the role of environmental factors, local differences and competition in plant invasions, we compared species of Impatiens (Balsaminaceae) of different origin and invasion status that occur in central Europe: native I. noli-tangere and three alien species (highly invasive I. glandulifera, less invasive I. parviflora and potentially invasive I. capensis). In two experiments we harvested late-stage reproductive plants to estimate performance. The first experiment quantified how populations differed in performance under varying light and moisture levels in the absence of competition. The second experiment quantified performance across these environments in the presence of intra- and inter-specific competition. The highly invasive I. glandulifera was the strongest competitor, was the tallest and produced the greatest biomass. Small size and high plasticity were characteristic for I. parviflora. This species appeared to be the second strongest competitor, especially under low soil moisture. The performance of I. capensis was within the range of the other Impatiens species studied, but sometimes limited by alien competitors. Our results suggest that invasion success within the genus Impatiens depends on the ability to grow large under a range of environmental conditions, including competition. The invasive species also exhibited greater phenotypic plasticity across environmental conditions than the native species. Finally, the decreased performance of the native I. noli-tangere in competition with other species studied indicates that this species may be possibly excluded from its sites by invading congeners.

Institute of Botany Academy of Sciences of the Czech Republic Průhonice Czech Republic

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Vitousek PM, D'Antonio CM, Loope LL, Westbrooks R (1996) Biological invasions as global environmental change. Am Sci 84: 468–487.

Mack RN, Simberloff D, Lonsdale WM, Evans H, Clout M, et al. (2000) Biotic invasions: Causes, epidemiology, global consequences, and control. Ecol Appl 10: 689–710.

Lambdon PW, Pyšek P, Basnou C, Hejda M, Arianoutsou M, et al. (2008) Alien flora of Europe: Species diversity, temporal trends, geographical patterns and research needs. Preslia 80: 101–149.

Winter M, Schweiger O, Klotz S, Nentwig W, Andriopoulos P, et al. (2009) Plant extinctions and introductions lead to phylogenetic and taxonomic homogenization of the European flora. Proc Natl Acad Sci USA 106: 21721–21725. PubMed PMC

Richardson DM, Macdonald IA, Forsyth GC (1989) Reduction in plant species richness under stands of alien trees and shrubs in fynbos biome. South Afr Forest J 149: 1–8.

Bímová K, Mandák B, Kašparová I (2004) How does Reynoutria invasion fit the various theories of invasibility? J Veg Sci 15: 495–504.

Hejda M, Pyšek P, Jarošík V (2009a) Impact of invasive plants on the species richness, diversity and composition of invaded communities. J Ecol 97: 393–403.

Pyšek P, Jarošík V, Hulme PE, Pergl J, Hejda M, et al. (2012c) A global assessment of alien invasive plant impacts on resident species, communities and ecosystems: The interaction of impact measures, invading species' traits and environment. Glob Change Biol 18: 1725–1737.

Rejmánek M, Richardson DM (1996) What attributes make some plant species more invasive? Ecology 77: 1655–1661.

Davis MA, Grime JP, Thompson K (2000) Fluctuating resources in plant communities: A general theory of invasibility. J Ecol 88: 528–534.

Daehler CC (2003) Performance comparisons of co-occurring native and alien invasive plants: Implications for conservation and restoration. Annu Rev Ecol Evol Syst 34: 183–211.

Seastedt TS, Pyšek P (2011) Mechanisms of plant invasions of North American and European grasslands. Annu Rev Ecol Evol Syst 42: 133–153.

Pyšek P, Richardson DM (2007) Traits associated with invasiveness in alien plants: Where do we stand? In: Nentwig W, ed. Biological Invasions. Ecological Studies 193. Berlin & Heidelberg: Springer-Verlag. pp. 97–126.

Van Kleunen M, Dawson M, Schaepfer D, Jeschke JM, Fischer M (2010a) Are invaders different? A conceptual framework of comparative approaches for assessing determinants of invasiveness. Ecol Lett 13: 947–958. PubMed

Grotkopp E, Rejmánek M, Rost TL (2002) Toward a causal explanation of plant invasiveness: Seedling growth and life-history strategies of 29 pine (Pinus) species. Am Nat 159: 396–419. PubMed

Grotkopp E, Rejmánek M (2007) High seedling relative growth rate and specific leaf area are traits of invasive species: Phylogenetically independent contrasts of woody angiosperms. Am J Bot 94: 526–532. PubMed

Kubešová M, Moravcová L, Suda J, Jarošík V, Pyšek P (2010) Naturalized plants have smaller genomes than their non-invading relatives: A flow cytometric analysis of the Czech alien flora. Preslia 82: 81–96.

van Kleunen M, Weber E, Fischer M (2010b) A meta-analysis of trait differences between invasive and non-invasive plant species. Ecol Lett 13: 235–245. PubMed

Moravcová L, Pyšek P, Jarošík V, Havlíčková V, Zákravský P (2010) Reproductive characteristics of neophytes in the Czech Republic: Traits of invasive and non-invasive species. Preslia 82: 365–390.

Baker HG (1965) Characteristics and modes of origin of weeds. In: Baker HG, Stebbins GL, eds. The Genetics of Colonizing Species. New York: Academic Press. pp. 147–168.

Pigliucci M (2005) Evolution of phenotypic plasticity: Where are we going now? Trends Ecol Evol 20: 481–486. PubMed

Rejmánek M, Richardson DM, Pyšek P (2005) Plant invasions and invasibility of plant communities. In: Van der Maarel E, ed. Vegetation Ecology. Oxford: Blackwell. pp. 332–355.

Richards CL, Bossdorf O, Muth NZ, Gurevitch J, Pigliucci M (2006) Jack of all trades, master of some? On the role of phenotypic plasticity in plant invasions. Ecol Lett 9: 981–993. PubMed

Hejda M, Pyšek P, Pergl J, Sádlo J, Chytrý M, et al. (2009b) Invasion success of alien plants: Do habitats affinities in the native distribution range matter? Glob Ecol Biogeogr 18: 372–382.

Funk JL (2008) Differences in plasticity between invasive and native plants from a low resource environment. J Ecol 96: 1162–1173.

Davidson AM, Jennions M, Nicotra AB (2011) Do invasive species show higher phenotypic plasticity than native species and, if so, is it adaptive? A meta-analysis. Ecol Lett 14: 419–431. PubMed

Palacio-López K, Gianoli E (2011) Invasive plants do not display greater phenotypic plasticity than their native or non-invasive counterparts: A meta-analysis. Oikos 120: 1393–1401.

Burns JH (2004) A comparison of invasive and non-invasive dayflower (Commelinaceae) across experimental nutrient and water gradients. Diversity Distrib 10: 387–397.

Leicht-Young SA, Silander JA Jr, Latimer AM (2007) Comparative performance of invasive and native Celastrus species across environmental gradients. Oecologia 154: 273–282. PubMed

Williams JL, Auge H, Maron JL (2008) Different gardens, different results: Native and introduced populations exhibit contrasting phenotypes across common gardens. Oecologia 157: 239–248. PubMed

Burns JH, Winn AA (2006) A comparison of plastic responses to competition by invasive and non-invasive congeners in the Commelinaceae. Biol Invas 8: 797–807.

Sakai AK, Allendorf FW, Holt JS, Lodge DM, Molofsky J, et al. (2001) The population biology of invasive species. Annu Rev Ecol Evol Syst 32: 305–332.

Keller SR, Taylor DR (2008) History, chance and adaptation during biological invasion: Separating stochastic phenotypic evolution from response to selection. Ecol Lett 11: 852–866. PubMed

Prentis PJ, Wilson JRU, Dormontt EE, Richardson DM, Lowe AJ (2008) Adaptive evolution in invasive species. Trends Plant Sci 13: 288–294. PubMed

Monty A, Mahy G (2009) Clinal differentiation during invasion: Senecio inaequidens (Asteraceae) along altitudinal gradients in Europe. Oecologia 159: 305–315. PubMed

Alexander JM (2010) Genetic differences in the elevational limits of native and introduced Lactuca serriola populations. J Biogeogr 37: 1951–1961.

Monty A, Mahy G (2010) Evolution of dispersal traits along an invasion route in the wind-dispersed Senecio inaequidens (Asteraceae). Oikos 119: 1563–1570.

Skálová H, Havlíčková V, Pyšek P (2012) Seedling traits, plasticity and local differentiation as strategies of invasive species of Impatiens in central Europe. Ann Bot 110: 1429–1438. PubMed PMC

Tilman D (1982) Resource Competition and Community Structure. Princeton: Princeton Univ. Press. PubMed

Shea K, Chesson P (2002) Community ecology theory as a framework for biological invasions. Trends Ecol Evol 17/4: 170–176.

Pathikonda S, Ackleh AS, Hasenstein KH, Mopper S (2009) Invasion, disturbance, and competition: Modeling the fate of coastal plant populations. Cons Biol 23: 164–173. PubMed

Vinton MA, Goergen EM (2006) Plant-soil feedbacks contribute to the persistence of Bromus inermis in tallgrass prairie. Ecosystems 9: 967–976.

Mangla S, Sheley RL, James JJ, Radosevich SR (2011) Intra and interspecific competition among invasive and native species during early stages of plant growth. Plant Ecol 212: 531–542.

Powell KI, Knight TM (2009) Effects of nutrient addition and competition on biomass of five Cirsium species (Asteraceae), including a serpentine endemic. Intern J Plant Sci 170: 918–925.

Molina-Montenegro MA, Peñuelas J, Munné-Bosch S, Sardans J (2012) Higher plasticity in ecophysiological traits enhances the performance and invasion success of Taraxacum officinale (dandelion) in alpine environments. Biol Invas 14: 21–33.

Richardson DM, Pyšek P, Rejmánek M, Barbour MG, Panetta FD, et al. (2000) Naturalization and invasion of alien plants: Concepts and definitions. Diversity Distrib 6: 93–107.

Pyšek P, Richardson DM, Rejmánek M, Webster G, Williamson M, et al. (2004) Alien plants in checklists and floras: Towards better communication between taxonomists and ecologists. Taxon 53: 131–143.

Blackburn TM, Pyšek P, Bacher S, Carlton JT, Duncan RP, et al. (2011) A proposed unified framework for biological invasions. Trends Ecol Evol 26: 333–339. PubMed

Skálová H, Moravcová L, Pyšek P (2011) Germination dynamics and seedling frost resistance of invasive and native Impatiens species reflect local climatic conditions. Persp Plant Ecol Evol Syst 13: 173–180.

Morgan DC, Smith H (1979) A systematic relationship between phytochrome-controlled development and species habitat, for plants grown in simulated natural radiation. Planta 145: 253–258. PubMed

Franks PJ, Farquhar GD (1999) A relationship between humidity response, growth form and photosynthetic operating point in C-3 plants. Plant Cell Environ 22: 1337–1349.

Malíková L, Prach K (2010) Spread of alien Impatiens glandulifera along rivers invaded at different times. Ecohydrol Hydrobiol 10: 81–85.

Dayan T, Simberloff D (2005) Ecological and community-wide character displacement: The next generation. Ecol Lett 8/1: 875–894.

Coombe DE (1956) Biological flora of British Isles: Impatiens parviflora DC. J Ecol 44: 701–714.

Beerling DJ, Perrins DM (1993) Biological flora of British Isles: Impatiens glandulifera Royle (Impatiens Roylei Walp.). J Ecol 81: 367–381.

Kartesz JT, Meacham CA (1999) Synthesis of the North American Flora. Version 1.0. Chapel Hill: North Carolina Botanical Garden.

Hatcher PE (2003) Biological flora of British Isles. Impatiens noli-tangere L. J Ecol 91: 147–167.

Slavík B (1997) Impatiens parviflora. In: Slavík B, Chrtek J Jr, Tomšovic P, eds. Květena České Republiky (Flora of the Czech Republic) Vol. 5. Praha: Academia. pp. 234–236.

Pyšek P, Danihelka J, Sádlo J, Chrtek J Jr, Chytrý M, et al. (2012b) Catalogue of alien plants of the Czech Republic (2nd edition): Checklist update, taxonomic diversity and invasion patterns. Preslia 84: 155–255.

Adamowski W (2008) Balsams on the offensive: The role of planting in the invasion of Impatiens species. In: Tokarska-Guzik B, Brock JH, Brundu G, Child L, Daehler CC, Pyšek P, eds. Plant Invasions: Human Perception, Ecological Impacts and Management. Leiden: Backhuys Publishers. pp. 57–70.

Pyšek P, Prach K (1995) Invasion dynamics of Impatiens glandulifera – a century of spreading reconstructed. Biol Cons 74: 41–48.

Pyšek P, Chytrý M, Pergl J, Sádlo J, Wild J (2012a) Plant invasions in the Czech Republic: Current state, introduction dynamics, invasive species and invaded habitats. Preslia 84: 576–630.

Perglová I, Pergl J, Skálová H, Moravcová L, Jarošík V, et al. (2009) Differences in germination and seedling establishment of alien and native Impatiens species. Preslia 81: 357–375.

Diggle PJ, Heagerty P, Liang KY, Zeger SL (2002) The Analysis of Longitudinal Data, 2nd edn. Oxford, England: Oxford University Press.

Zuur AF, Ieno EN, Walker NJ, Saveliev AA, Smith GM (2009) Mixed Effects Models and Extensions in Ecology. New York: Springer.

Verbeke G, Molenberghs G (2000) Linear Mixed Models for Longitudinal Data. New York: Springer.

Crawley MJ (2002) Statistical Computing. An Introduction to Data Analysis Using S-Plus. Chichester: Wiley.

Crawley MJ (1993) GLIM for Ecologists. Oxford: Blackwell Scientific Publications.

Sokal RR, Rohlf FJ (1995) Biometry, 3rd edn. San Francisco: Freeman.

R Development Core Team (2009) R: A language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. ISBN 3-900051-07-0, URL http://www.R-project.org.

Reinhart O, Gurnee J, Tirado R, Callaway RM (2006) Invasion through quantitative effects: Intense shade drives native decline and invasive success. Ecol Appl 16: 1821–1831. PubMed

Pyšek P, Prach K (1993) Plant invasions and the role of riparian habitats – a comparison of four species alien to central Europe. J Biogeogr 20: 413–420.

Richardson DM, Holmes PM, Esler KJ, Galatowitsch SM, Stromberg JC, et al. (2007) Riparian vegetation: Degradation, alien plant invasions, and restoration prospects. Diversity Distrib 13: 126–139.

Chytrý M, Maskell LC, Pino J, Pyšek P, Vilà M, et al. (2008) Habitat invasions by alien plants: A quantitative comparison among Mediterranean, subcontinental and oceanic regions of Europe. J Appl Ecol 45: 448–458.

Pyšek P, Bacher S, Chytrý M, Jarošík V, Wild J, et al. (2010) Contrasting patterns in the invasions of European terrestrial and freshwater habitats by alien plants, insects and vertebrates. Glob Ecol Biogeogr 19: 317–331.

Blumenthal D, Mitchell CE, Pyšek P, Jarošík V (2009) Synergy between pathogen release and resource availability in plant invasion. Proc Natl Acad Sci USAmerica 106: 7899–7904. PubMed PMC

Foxcroft LC, Rouget M, Richardson DM (2007) Risk assessment of riparian plant invasions into protected areas. Cons Biol 21: 412–421. PubMed

Foxcroft LC, Jarošík V, Pyšek P, Richardson DM, Rouget M (2011) Protected-area boundaries as filters of plant invasions. Cons Biol 25: 400–405. PubMed PMC

Lhotská M, Kopecký K (1966) Zur Verbreitungsbiologie und Phytozönologie von Impatiens glandulifera Royle an den Flussystemen der Svitava, Svratka und oberen Odra. Preslia 38: 376–385.

Vilà M, Weiner J (2004) Are invasive plant species better competitors than native plant species? – evidence from pair-wise experiments. Oikos 105: 229–238.

Competition among native and invasive Impatiens species: the roles of environmental factors, population density and life stage

Resource competition in plant invasions: emerging patterns and research needs