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invasive (adjective) – spreading; referring to an introduced species that is rapidly and aggressively establishing in an area where it was previously not present. The term invasive is frequently used in a strongly negative connotation, arguing that invasive species generally displace and endanger native vegetation. In the same context it is often argued that introduced species that rapidly and successfully become naturalized, are generally invasive. Although there is evidence that the introduction of species often has drastic effect on a local flora and fauna, the ecological processes of competition, dispersal and establishment are poorly understood.

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