Invasive species could not be defined simply, since the outcome of such species differentiates individually. IAS could be called as a species subspecies or lower taxon that is not naturally occurring at a given locality at a given time, yet introduced to that area, where they could compete or cause damage to species existing in the area, in short or long term. Several of these factors independently or collectively present in a species could make a species an IAS. Similarly, there is a group called Non-native species (NNS), those of which introduced by humans outside of their natural or native range. However Invasive Non-native Species (INNS ) are those which cause unwanted environmental or social impacts by spreading fast and becoming incredibly abundant in the environment (UNEP, 2005,). It is not well understood why some species become invasive and others d...
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...re in the United Kingdom. Available at: http://www.defra.gov.uk/evidence/statistics/foodfarm/general/auk/latest/documents/AUK-2009.pdf [Accessed 10.02.2011].
UNEP (United Nations Environmental Programme). (2002a) COP 6 Decision VI/26. Strategic Plan for the Convention on Biological Diversity. The Hague, 7–19 April 2002. Available at: http://www.cbd.int/decisions/?dec=VI/26, [Accessed 27.01.2011].
UNEP (United Nations Environmental Programme). (2005) Report of the Subsidiary Body on Scientific, Technical and Technological Advice on the work of its tenth meeting. Bangkok, 7-11 February. Documentation made available for Conference of the Parties to the Convention on Biological Diversity, eighth meeting, Curitiba, Brazil, 20-31 March 2006 as UNEP/CBD/COP/8/2. Available at: http://www.cbd.int/ doc/meetings/cop/cop-08/official/cop-08-02-en.pdf [Accessed 10.02.2011].
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