Alien invasive species are native to a particular region, but have been introduced elsewhere, either by accident or on purpose, significantly colonizing their new home. Alien species thrive because they are no longer controlled by the predators, pests, parasites and diseases with which they have co-evolved within their natural range. They are therefore able to out-compete the indigenous species in the area to which they have been introduced. Another reason that they often have negative impacts is that the indigenous species they meet in their introduced range have not evolved any defenses against the alien species.
Mesquite trees (Prosopis juliflora) one of invasive species in Egypt that widespread in Gabal Elba Protected area and have a negative effect on its biodiversity due to competition on water resources and space. |
