Plant invasions and the role of riparian habitats: a comparison of four species alien to central Europe.

In the process of plant invasion rivers may act as dispersal agents, supporting downstream movement of diaspores by water (e.g. Stani-forth & Cavers, 1976; van der Pijl, 1982; Schneider & Sharitz, 1988; Skoglund, 1989). Moreover, periodic disturbances resulting from destructive flooding generally destroy or damage a large part of riparian vegetation (Ellenberg, 1988) thus creating openings that provide suitable habitats and favourable nutrient conditions for seedling establishment and subsequent colonization (Walker, Zasada & Chapin, 1986). Consequently, riparian habitats into which an alien species was successfully introduced and naturalized may serve as foci for subsequent spread into the adjacent landscape (Pysek, 1991, 1993).

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