Yeah this is something people really don't quite know about. There has been so many government programs that have completely failed this ecosystem in the past that it is indeed a complete trainwreck. You see this with almost every federally owned park, they screw up the ecosystem so bad by either mucking around with purposefully introducing species in mass or by not handling the pollution or tourism correctly.
Its all a lesson in the Problem of the Commons 101, including that the government itself is subject to this problem.