

Your question appears to ask about invasive species more than biodiversity on the whole.
On the former, an invasive species can completely destroy local populations of indigenous species and become established. Sometimes just partially, sometimes completely.
The endgame of biodiversity? Evolution has no endgame, it just is. A constant adaptation where some species die out and new speciation fills any spaces created by their absence. Nature abhors a vaccum.









Escape Heat Death? I’m just trying to get past Tuesday.