hat
Ekosistèm maren yo gen anpil espès plant, bèt ak mikwo-òganis ki te evolye nan izolasyon, separe ak baryè natirèl. Aktivite transpò imen tankou anbakman ak vwayaj nan lè te pèmèt espès sa yo deplase pi lwen pase chenn natirèl yo nan nouvo zòn. Yon espès anvayisan defini kòm yon espès ki pa natif natal (etranje) nan yon ekosistèm ak / oswa ki gen entwodiksyon ki lakòz, oswa gen anpil chans pou lakòz domaj sosyal, ekonomik, oswa anviwònman an. Espès natif natal ka vin pwogrese tou si yo koze domaj pa kolonizasyon dominan nan yon ekosistèm akòz pèt nan kontwòl natirèl (sètadi, pèt nan predatè oswa èbivò).
eng
Marine ecosystems contain many species of plants, animals and microorganisms that have evolved in isolation, separated by natural barriers. Human transportation activities such as shipping and air travel have allowed these species to move beyond their natural ranges into new areas. An invasive species is defined as a species that is non-native (alien) to an ecosystem and/or whose introduction causes, or is likely to cause social, economic, or environmental harm. Native species may also become invasive if they cause harm by dominant colonization of an ecosystem due to loss of natural controls (i.e., loss of predators or herbivores).