Bismarck, N.D. — Ron Nerva realized his out-of-state waterfowl-hunting plans were sliced in half Aug. 1. That’s when he read about changes to North Dakota’s rules for nonresident hunters. Nerva, a waterfowler from Tomahawk, Wis., has owned a hunting camp in Esmond, N.D., since 2003. Since then, each fall in the past, he’d hunted ducks and geese for the maximum of 14 days that out-of-staters were allowed.