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Nature 421, 585-586 (6 February 2003) | doi:10.1038/421585a

Conservation biology: Parasites lost

Keith Clay

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Why do some plants and animals become pests when they are introduced to new areas? Part of the answer seems to be that they have left most of their parasites behind, gaining vigour as a consequence.

Invasive species can be a real bother. These are plants or animals that, when they are accidentally or deliberately moved from one region to another, flourish to the extent of getting out of hand and becoming pests in their naturalized environment.