what’s the issue with the introduction of foreign species to habitats in which they thrive? Change is a part of life and we humans ourselves are a foreign species everywhere outside of Africa.
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Part of the problem with an invasive species is that there is little that threatens it in its new environment. No diseases that affect it and no predators that eat it may let a species “thrive”, but with no pressure to keep it in check, it will take over the environment and push out the native species. Even if its something as simple as a different species of grass that the local herbivores can’t or don’t eat, it will survive when others die. Eventually, it will become the dominant species of grass, leaving less for the local herbivores to eat. If the herbivores go, the carnivores go, and you have a collapse of the local ecosystem. Basically, thriving is only good up to a point before you “thrive” at the expense of everything else.
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