Publication by means of UNESCO
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Extra resources for Aquatic Vegetation and Its Use and Control
G. Volta Lake). Emergent plants also provide the rather special conditionsneeded by swamp inhabitants,such as the swamp worm, Alma enzini. In such swamps,Alma digests large amounts of detritus. Emergent macrophytes often provide extensive areas of plant cover above water. In papyrus swamps,each papyrus stem is terminated by a large umbel with many long rays. Thornton (1957) found each umbel supported a fauna which was strongly correlated with umbel development. Another emergent,Phragmites australis, serves as a host for the parasitic smut fungus,Ustilago grandis, in addition to other plant and animal pests (Durska, 1970).
1965)cited a study which showed that a dense mat of Eichhornia crassipes covering canals in the Everglades in Florida,reduced the efficiency of large canals to 40 per cent,while small canals were reduced by up to 80 per cent of flow capacity.
All have a free floating life-form, while Ceratophyllum demersum is characteristically unattached and may form large masses drifting about just below the surface of the water. Members of this group of species are generally characterized by a number of factors which undoubtedly contribute to their success. Those that appear to be most important are: a capacity for rapid vegetative multiplication;an ability to regenerate from relatively small portions of vegetative thallus; a complete or partial independence from the strictures of sexual reproduction,which,even if manifested, seldom seems to play a major part in the establishment of excessively large populations;a growth morphology,which results in a large area ofphotosynthetic tissue in proportion to the whole plant body that rapidly occupies the available water surface or photic zone;and finally,an independence of substrate conditions and fluctuations in water level.