Zone de Texte: The need for common definitions Zone de Texte: Major invaders: alien invasive species well established and which already have a substantial impact on natural and semi-natural ecosystems Zone de Texte: Emerging invaders: alien invasive species have less impact but have attributes and potentially suitable habitats that could result in increased range and impact in the next few decades. Zone de Texte: Cf. RICHARDSON ? al., 2004

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