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THE NORMAL ROLE OF VEGETATION IN WATER Gaudet
THE DEVELOPMENT OF EXCESSIVE POPULATIONS OF AQUATIC
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acrolein algae Alternanthera philoxeroides animals aquatic environment aquatic macrophytes aquatic plants aquatic vegetation aquatic weed problems biological control Blackburn boats Boyd canals cent chemical concentrations control measures control of aquatic crude protein cutting depth developed diquat dry weight ecosystem effects effluents Eichhornia crassipes Elodea emerged plants emergent species endothall environmental eutrophic evapotranspiration factors fish floating plants floating weeds growing season habitat harvesting herbicides hydrophytes important increase insects irrigation kg/ha Lake Kariba large number macrophytes man-made lakes methods Mitchell Myriophyllum nutrients occur oxygen phytoplankton plant communities plant growth pollution ponds populations possible Potamogeton production programme rapid reed swamps release rhizomes river Salvinia molesta sediments shallow silt simazine standing crops submerged aquatic submerged macrophytes submerged plants submerged species submerged weeds substrate Sutton t/ha temperature tion toxic tropical Typha latifolia United utilization vascular hydrophytes water body water level water resources water surface water weeds Weldon