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Biological invasions are recognized as a global phenomenon with serious ecological, economic and social consequences (Drake et al., 1989; Williamson, 1996). Especially in freshwater habitats, exotic plants are particularly common (Parker & Hay, 2005). Some studies show that the presence of exotic plants is negatively affecting the abundance and distribution of native plant species in wetlands (Houlahan & Findlay, 2004).
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