Ya know what don't make sense to me? I've got a National Seashore report from 2 or 3 years ago.. finding that nests near ORV's and foot traffic from people had a higher rate of survival, due to the fact that the increased people/vehicle traffic, kept the predators away, and that the few that were run over/stepped on, were less than what the predators would have got.
So, why the closures? Coyote, fox, feral cat, skunks, raccoons, last I knew they can't read the signs, and they don't give a rats arse about a fence, or an enclosure, just another obstacle, that they WILL overcome. Closures just make somebody feel like they are doing something, I guess.....
Powers that be don't want to hear it or change it, and interestingly enough, you cannot obtain any more copies of that report, and the people that compiled the info, have been... transferred, to another National Park.