Why are invasive species bad for terrestrial and aquatic ecosystems. What do they do?

Question

Why are invasive species bad for terrestrial and aquatic ecosystems. What do they do?

Answer 1

they destroy the balance in the ecosystem by either depleting a needed resource such as a food source or killing a species of plants or animals that contribute to the system's successful existence.

if a certain invasive weed, for example, chokes out another plant that the area birds depend on for food, they are forced out of the area.  this means the other animals that prey upon them will no longer have their source of food, and so on, and so on up the food chain.

Answer 2

invasive species are non-native species that thrives in the new introduced environment because there isn't any established competition for it. Since no competition is there to control the growth of that species, the species pretty much outcompete other defenseless native species for natural resources and space.