These species grow uncontrollably and can take over and destroy an ecosystem:
native
endemic
invasive
threatened

invasive

Invasive species can threaten an ecosystem and the biodiversity of the organism that exist in the present environment when the invasive species increase rapidly in number. 
Exotic species are a threat to biodiversity because they alter the ecosystem of that area. They share food and habitat resulting in unbalanced ecosystem. Also, habitat destruction destroys the habitat of all the life forms in that area. 

He should put sand around the spill in order to contain it so that it won't spread