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Invasive Species : a subset of those species defined as introduced species or non-indigenous species. Invasive species can alter ecological relationships among native species and can affect ecosystem function, economic value of ecosystems, and human health. A species is regarded as invasive if it has been introduced by human action to a location, area, or region where it did not previously occur naturally (i.e., invasive), becomes capable of establishing a breeding population in the new location without further intervention by humans, and spreads widely throughout the new location. (Wikipedia) |