cottonstalk,
We (myself, my dad and two brothers) have done a lot of bow/rifle hunting directly behind our house in a small wood lot (~75-100 acres). It is very thick and is primarily old overgrown apple orchards and is flanked by a decent sized swamp/brush lot (bedding area). There have been times when one of us shot something from one stand in the morning and then someone went back that same night and shot another deer. I also remember one evening a fall or two ago when I was standing at one of the spots and along came the land owner on his old International towing a brush hog. I just stood there hoping he wouldn't see me and stop, and luckily he just passed on by. Nothing better to do, I figured I would stand there until dark (another 15 minutes). Good thing I did because soon after the tractor left, along came a nice 7 pointer, (I'm sure confused as hell) right down the new trail. He dressed out at 145 lbs.
My point is that even after all that noise, a ten foot swath of trees and brush cleared and a fresh strip of torn up ground so wide a small bush plane could have landed, the deer still came to my stand.
I think two important things that matter in that situation, at least in my area, is how far and how frequently the deer are moving on a daily basis, and how quiet and "scent aware" you are when you are in the woods. Usually after a couple of weeks of the four of us being in and out of there, the amount of deer sign definately starts to decrease.
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If you want to save a species, simply decide to eat it. Then it will be managed.