But not all, as some are territorial, like Lutra lutra.
“ In some areas, they may have reached a maximum population.”
But yes I agree if you keep pilling the food up out in the wilds and don’t protect it, it’s likely something will take a liking to it. (What idiots would do that?) Maybe even lutra lutra, just not plagues of them.
I cant think of any predator that wont try to protect the prey they rely on and I agree that otter are very territorial as are most mammals or birds when it comes to mating or keeping the females they have control over.
Its one of the reasons why I don't believe that the rehabilitation of orphaned or injured otter should be released into the wild, those releasing them need to be so sure its not being done in another otter territory or they could just end up injured again or dead which imo is not right just to make someone feel good about what they are doing.
Its difficult to know whether in some area's they have reached saturation point, even the experts on otter cannot agree on numbers, they may have reached saturation point in some area's due to the availability of food but that's not to say that if the food supply increases that otter numbers wont increase.
In predator and prey relationships there always needs to be a larger number of prey than predators, in some small rivers (one I know intimately) that has become reversed to such an extent that prey can no longer be found in large stretches of it, I don't dislike otter far from it but what I don't like is damage that has been done in a headlong rush to increasing otter numbers that were recovering nicely on their own before the ill thought out reintroductions.