Actually it’s never quite as simple as that. Especially when you look at the ripple affect when you remove an apex predator.
Well, coyotes replaced wolves up in the Rockies. The enviro-wackos’ claims that the lack of wolves threw the balance off was a bunch of hooey. Life is dynamic. Something else will fill the niche.
I recall a pbs thing...
Man had killed off the wolves in this area. Which resulted in a population increase of deer and other prey animals ...
Well the deer began to eat all the vegitation along a river bank. The banks began to erode. Then massive flooding began. Then the town folk lost everything because of the flooding ...
Yada. Yada. Yada years later, they brought back the wolves.