Northern Prairie Wildlife Research Center
During January-March, many mallards (Anas platyrhynchos) were wary of humans, often flying 60 m in advance of an approaching boat. They were reluctant to take food from people. During the rest of the year, lagoon ducks were much less apprehensive and paid little attention to moving boats. Increased wariness during winter may be due to an increased number of wild migrant birds in the Angelholm flock. One of seven factors contributing to severe brood losses in the lagoon was the capturing and scattering of broods by people. Lesser (pers. comm.) noted that the total hatch of 28 and 13 mallard ducklings during 1974 and 1975, respectively, on a small campus pond was destroyed by cats and dogs.
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/literatr/disturb/bibli071.htm
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Menlo Park, CA [caww54]
