Gehajake - if I were concerned about turkey (and ground nesting birds in general) I would take up trapping coons, skunks, feral cats, and yotes. A LOT of experienced habitat managers will tell you of the benefits to turkeys by removing a portion of these animals. It can happen quickly too. Increase of poult numbers the falling summer with larger flocks of birds the following yr. With that said there is a decline of turkey numbers that seems be nation wide. Even to the point that many states are considering lower tag numbers for hunters. Nobody seems to know exactly what's causing it.