Why is the excessive increase in the number of elephants disturbing the original ecosystems

Why is the excessive increase in the number of elephants disturbing the original ecosystems of Africa, leading, ultimately, to a change of communities.

The number of elephants in our time is increasing, but if you compare the number of elephants fifty years ago and now, at the moment there are about 40% fewer of them. This is due to poaching and hunting for ivory. Now conservationists have been able to achieve a ban on the killing of elephants. But with an increase in the number of these animals, the ecological system will change. And everything is explained very simply. Elephants are large animals. Many plants are needed to feed them. But there are other animals in Africa that will find it more difficult to get food. Therefore, it is necessary not to interfere with natural selection and artificially increase or decrease the number of certain animals.