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Falli omnesque vivendum eos ad, ei hinc diceret eos. The one where elk chose to give birth next to highways because of the lesser number of bears. All the difficulties in the classic model of an ecosystem that stays the same forever with interactions. Even the addition of "disturbance" with the theory that the forest could, say, have region There are forests that look primordial, but have trees that could grow for a millennium, where none of them are older than years -- when the climate changed.
Whites radically changed the environment of the Americas without even trying to settle. The orchards they grew of nut trees went back to the wild.
The enormous herd of buffalo that Lewis and Clark reported were probably there because their biggest predator had been taken out. Not that the Americas had not suffered massive changes from them before. Their arrival brought about the extinction of the megafauna.
Most of those we still have came from Asia at the same time. Forest managed to grow much more widely without. Then, most other arrivals of humans saw the megafauna died out. New Zealand -- the ancestors gave up their chickens to hunt such birds as the flightless and enormous moa. Then they worked their way through the other hapless birds, and in due course found themselves facing serious hunger issues.
Giving up chickens had not been wise. This produces interesting arguments: ecologists who argue that feral burros and mustangs are wonderful additions because they revert the Southwest to the pre-human ecosystem, which did have equines. At least as well as can be done. Some want to introduce camels, elephants, cheetahs as substitutes, too, and if people object to cheetahs -- why, Africans have to live with large, dangerous predators for ecological reasons.
Why should North Americans be exempt? Goes into the subject of those innocuous islands that get so wrecked when they get contact. Birds that have lost the ability to fly. Roses and raspberries that lose their thorns. Mammals, like those in Australia, that got stupid because Australia was so harsh that being smart was too much a drain on the system.
This woke the world-building theorist in me. I wonder how large they could be. New Zealand with all its flightless birds was pretty big.
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