Surely Beavers and salmonids co-existed in the same rivers for thousands of years before Beaver were exterminated?

Yes, but co-existence does not mean species not impacting on each other – all Predators and Prey “co-exist”, for example. Where there are fewer Salmon fry upstream of a Beaver dam than below because access by spawning adults is restricted, the species are “co-existing” but salmon are being impacted nevertheless. Of course the extent of that co-existence so long ago is not known.

What we do know is that Salmon in particular are an important feature of our river ecosystems and rural economies and that they are under great pressure out at sea so require very careful management, where this is possible, which is during their fresh water phase. More.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.