However, a significant subset of alien species can become invasive and have serious adverse impact on biodiversity and related ecosystem services, as well as have other social and economic impact, which should be prevented.
Mar sin féin, is féidir le fo-thacar sonrach de speicis choimhthíocha éirí ionrach agus tionchar díobhálach tromchúiseach a bheith aige ar an mbithéagsúlacht agus ar na seirbhísí gaolmhara éiceachórais, chomh maith le tionchar sóisialta agus eacnamaíoch eile a bheith acu, ar tionchar é ba cheart a chosc.