Northern Prairie Wildlife Research Center
Human disturbance frequently prevented waterfowl from using habitat. Attempts to collect waterfowl eliminated most or all waterfowl use for a few days from a unit that had been supporting large concentrations of birds. This bias caused by research activities form the basis for the opportunistic nature of the censuses. Systematic walk-through counts would have caused additional human disturbance to waterfowl. Unpredictable disturbance resulting from the public is an unknown variable that undoubtedly biased the census data. No gross changes in study impoundment use in relation to duck hunting season were detected.
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/literatr/disturb/bibli134.htm
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Menlo Park, CA [caww54]
