ABSTRACT
An ecosystem involves the capture and accumulation of energy and matter, and their circulation and transformation through the medium of biotic things and their activities. The assemblage of plants and animals in an ecosystem usually consists of numerous species, each represented by a population of individual organisms. All functions, and indeed all life, within an ecosystem depend upon the utilization of an external source of energy, solar radiation. The biotic factors of the ecosystem provide the environment for growth of aquatic plants. Specific management of excessive growth of aquatic plants is frequently necessary under particular conditions that stimulate their growth. The single greatest risk involved in chemical weed control is misuse. Biological control of aquatic plants appears to have great potential, but has been largely unsuccessful because of the difficulty in finding organisms which can effectively reduce the growth rate of the aquatic plants.
