That is very interesting, I wish this kind of things were taught in school. Too many people think that animals just exists in the current state for ever. When in reality it is a dynamic system that once changed cannot be brought back.
There's some amount of introduced pressure due to invasive species of both trees and pests but it's always been this way. Everything is in flux all the time.
Stable pockets exist but they're relatively rare.
But human civilization as we know it is fragile.
This species didn't just die, it was exterminated by humans. It is the difference between someone dying fro a sickness and from a bulled to the head.
> overindexing
How can be stop fishing species to extinction "too much"? How can you justify that way of thinking in this concrete case?
Which species? The (non-extinct, not exterminated) cod fish whose ecological niche has been taken over to some extent by a small shark species?
I can't find anything about niche occupancy replacement at all on the Web. Searches lead to information about the trophic decline in prey species after an initial boom when the North Atlantic cod went down to something like 1% of previous volume. Some mention of harp seals competing with younger smaller cod for available food (which is scarce now apparently).
Could be a case of a small effect earlier in the timeline masked by huge changes resulting from warming water &c.
It's like clear-cutting an old-growth forest, and then replanting acorns. The forest simply won't return to anything like its original state for many decades - if ever.