I'm having a really hard time understanding how you can't see this!? Let's try this and oversimplify it a bit...
Take an imaginary state, call it Quackistan. Quackistan is not large and has only two lakes. The first lake, Private Lake, is average size and is surrounded by corn fields. Most of the private landowners allow hunting. The second lake, Public Lake, is a huge, beautiful lake, but is surrounded mostly by sage fields with scattered private crop fields owned by people who also allow hunting. The local biologists have come up with a management plan that calls for 10,000 ducks as a population objective and quotas to achieve that number. Ducks fly freely between the two lakes, populations are managed fairly well, most hunters go home happy, and the population stays at, near, or slightly above objective.
Then, years down the road, Jane Fonda moves in, buys Private Lake and all the surrounding corn fields and shuts down hunting access. Hunters soon begin to all focus on Public Lake and soon the numbers there diminish as the ducks quickly learn that they are safe on Private Lake. The biologists understand what is happening and quickly drop bag limits to attempt to rebuild the population on Public Lake. Additionally, they increase their management number from 10,000 to 15,000 understanding that if the ducks are going to congregate on Private Lake, then Public Lake can definitely handle the additional 5,000. This works for a time, but the bitch, Jane Fonda, starts complaining that the ducks are destroying her crops and gets a congressman to write a bill stating that the ducks need to be managed based on the total land available, not just that which can be hunted. The management plan goes back to 10,000. This doesn't take the pressure off of Jane's fields so years down the road, she gets another congressman to push through a bill which allows hunting year round to try and control the duck population. Jane agrees to allow duck hunting on her place, by appointment only, one month out of the year.
In the end, it still doesn't work. The objective calls for 10,000 ducks. Statewide there are currently 12,000 ducks (20% over objective) although 9,000 of them reside exclusively on Private Lake. The biologists testify that Public Lake can hold 8,000 by itself, but nobody listens.