• Open Access

A global assessment of invasive plant impacts on resident species, communities and ecosystems: the interaction of impact measures, invading species' traits and environment

Authors

  • Petr Pyšek,

    Corresponding author
    1. Department of Ecology, Faculty of Science, Charles University Prague, Prague, Czech Republic
    2. The Bio-Protection Research Centre, Lincoln University, Canterbury, New Zealand
    • Institute of Botany, Department of Invasion Ecology, Academy of Sciences of the Czech Republic, Průhonice, Czech Republic
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  • Vojtěch Jarošík,

    1. Institute of Botany, Department of Invasion Ecology, Academy of Sciences of the Czech Republic, Průhonice, Czech Republic
    2. Department of Ecology, Faculty of Science, Charles University Prague, Prague, Czech Republic
    3. The Bio-Protection Research Centre, Lincoln University, Canterbury, New Zealand
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  • Philip E. Hulme,

    1. The Bio-Protection Research Centre, Lincoln University, Canterbury, New Zealand
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  • Jan Pergl,

    1. Institute of Botany, Department of Invasion Ecology, Academy of Sciences of the Czech Republic, Průhonice, Czech Republic
    2. Institute of Ecology and Evolution, University of Bern, Bern, Switzerland
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  • Martin Hejda,

    1. Institute of Botany, Department of Invasion Ecology, Academy of Sciences of the Czech Republic, Průhonice, Czech Republic
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  • Urs Schaffner,

    1. CABI Europe-Switzerland, Delémont, Switzerland
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  • Montserrat Vilà

    1. Estación Biológica de Doñana (EBD-CSIC), Avda. Américo Vespucio s/n, Sevilla, Spain
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Correspondence: Petr Pyšek, tel. + 420 271 015 266, fax + 420 271 015 105, e-mail: pysek@ibot.cas.cz

Abstract

With the growing body of literature assessing the impact of invasive alien plants on resident species and ecosystems, a comprehensive assessment of the relationship between invasive species traits and environmental settings of invasion on the characteristics of impacts is needed. Based on 287 publications with 1551 individual cases that addressed the impact of 167 invasive plant species belonging to 49 families, we present the first global overview of frequencies of significant and non-significant ecological impacts and their directions on 15 outcomes related to the responses of resident populations, species, communities and ecosystems. Species and community outcomes tend to decline following invasions, especially those for plants, but the abundance and richness of the soil biota, as well as concentrations of soil nutrients and water, more often increase than decrease following invasion. Data mining tools revealed that invasive plants exert consistent significant impacts on some outcomes (survival of resident biota, activity of resident animals, resident community productivity, mineral and nutrient content in plant tissues, and fire frequency and intensity), whereas for outcomes at the community level, such as species richness, diversity and soil resources, the significance of impacts is determined by interactions between species traits and the biome invaded. The latter outcomes are most likely to be impacted by annual grasses, and by wind pollinated trees invading mediterranean or tropical biomes. One of the clearest signals in this analysis is that invasive plants are far more likely to cause significant impacts on resident plant and animal richness on islands rather than mainland. This study shows that there is no universal measure of impact and the pattern observed depends on the ecological measure examined. Although impact is strongly context dependent, some species traits, especially life form, stature and pollination syndrome, may provide a means to predict impact, regardless of the particular habitat and geographical region invaded.

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