Status and trends of wetlands in the conterminous United States 1986 to 1997.




Dahl, T.E.

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U.S. Fish and Wildlife Service


The Emergency Wetlands Resources Act requires the U.S. Fish and Wildlife Service to update its wetland status and trends information at ten-year intervals. Data in this and previous status and trends reports (Galveston Bay Collection Acc# 6466 and Texas A&M University at Galveston Library QH541.5.M3 D34 1991) provide important long-term trend information about specific changes and places and the overall status of wetlands in the United States. The study design consists of 4,375 randomly selected sample plots, each of 4 square miles in area. These plots were examined with remote sensing data and field work to determine change. This study encompassed all wetlands including freshwater, marine, and estuarine. Wetland losses and gains were assigned to five general categories: upland urban development, upland agriculture, upland silviculture, upland rural development, and miscellaneous lands.


82 pages