>>5003635This is the real answer, don't know why it took so long to be posted.
>Compare the fish species of say maine to the great lakes and you will see how limited the biodiversity isGreat Lakes is diverse because the Mississippi River leads to it. It's connected to Tennessee which has the most freshwater fish diversity in the USA because it's where the glacial refuge was.
Compare it to something like the Potomac or Delaware River that only goes for like 400 miles through formerly glaciated land and then coastal plains. Look at historical records and they didn't have shit until we stocked it with gamefish.
>>5002932"Invasive" is a buzzword. You can't just pick a moment in time and demand it to stay like that forever. Species are simply returning to their former homes. Ailanthus (tree of heaven) fossils were found in the US, as were things like tegus and boas.
>inb4 they're from other countries!Armadillos, coyotes, and alligators are also expanding their range.