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American lotus animals annual cycle areas Back swimmers barnyardgrass beaver ponds biomass Blue-winged teal bulrush Canada Canada goose cattail Chironomids Chufa tubers composition contaminated cottonwood dabbling ducks disking early Echinochloa effective enhance feathers female Fish and Wildlife foraging geese germination glyphosate growing season growth habitats herbaceous herbicide identified important impoundments inches INTERIOR FISH invertebrate Leaflet 13 Washington Leigh H levees mallards manipulations marsh migration millet Missouri-Columbia Puxico moist-soil molt monitor nesting North America Northern pintail nutrient nutritional oil spill oiled birds Polygonum potential prairie problem vegetation protein purple loosestrife refuge rehabilitation reproduction requirements response sampling Scientific Names seasonally flooded seed production seedlings shallow smartweed soil species strategies Table techniques tion traps tuber production tubers University of Missouri-Columbia water depths water levels water regimes waterfowl WATERFOWL MANAGEMENT HANDBOOK wetland wetland complexes wetland management Wildlife Leaflet 13 WILDLIFE SERVICE Fish willow wintering wood ducks woody