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area of wetlands average visual obstruction blue-winged teal broods blue-winged teal nesting blue-winged teal pairs brood habitat class or water classification system constructed wetlands cover type Cowardin dabbling duck Director U.S. Fish dominates the deepest emergent vegetation ephemeral wetlands Equation equivalent optimum area equivalent optimum wetlands evaluate blue-winged teal Fish and Wildlife habitat for blue-winged Habitat Suitability Index habitat variables height and density herbaceous index for blue-winged Kantrud and Stewart Kirsch low-prairie zones Manitoba mean visual obstruction nest site selection nesting cover nests/km2 North Dakota number of equivalent number of wetlands pair habitat pairs and broods pairs in South permanent wetlands ponds and lakes Prairie Pothole Region preference indices Regional Director U.S. residual vegetation Richard McCabe Ruwaldt semipermanent wetlands Stewart and Kantrud stock ponds study area Table teal nest density untilled upland visual obstruction measurement water regime modifiers waterfowl wetland class wetlands available Wildlife Service zone dominates