Definition: Invasive species

Forestry

Species of fauna and flora of non-local origin which has established itself or has been introduced into a given area and has spread in the natural conditions on an undesirable scale, e.g. to the extent that it has replaced or seriously suppressed the species previously occupying this specific area.
Source:
Economic Commission for Europe of the United Nations (UNECE)/ Food and Agriculture Organization of the United Nations (FAO), Terms and Definitions, "Temperate and Boreal Forest Resources Assessment 2000", United Nations, July 1997
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