Northern Prairie Wildlife Research Center
If certain areas are opened to the public for recreational use, such as fishing, use by waterfowl will sharply decrease. as demonstrated in 1947 when Study Area IV was included within the area open to fishing. During that year only two broods and 70 adult ducks were seen. In the two years that followed, however, when this marsh was closed to fishing, a marked increase in both broods and adults was noticed. Study Area IV has the highest interspersion index (45/9) and was foremost in duckling production in 1948 and 1949. By contrast its 1947 output was very low because that year it was included within the open-to-fishing zone. Because of the constant disturbance from fishermen, was virtually abandoned as a duckling-rearing marsh.
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/literatr/disturb/bibli007.htm
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Menlo Park, CA [caww54]
