It’s really all about habitat.
And competition among species.
Our chainsaws will kill a tree faster than a cormorant, but the tree is just as dead.
Cormorants arrived on Lake Nosbonsing in the past 10 years or so and prefer to roost on the end of a small island out in the main part of the lake.
Cormorants are not popular birds in Ontario.
The inevitable result of their fish diet kills vegetation and trees where numbers of them congregate.
Something like humans.