In my opinion, overfishing, especially commercial fishing is the cause, either directly, or indirectly. The Coast Guard just caught a factory ship, illegally drift-netting in Alaska waters. No country will claim ownership, but the crew are all from Indonesia. The ship is also overun with rats.
There are enough interesting animals that live on the Kenai Peninsula, that I think I will do another post about them soon. Maybe I'll concentrate on seabirds although I dont have photos of most species.