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Causes of changes in river vegetation giving rise to complaints. 1986. Proceedings EWRS/AAB 7th Symposium on Aquatic Weeds 1986, 1516.
Stream vegetation is in constant flux, with plants entering, varying in pattern and abundance, and leaving each site. Gradual change in this dynamic system may be brought about by the imposition of a new environmental pressure; major disturbance (e.g. dredging) may cause more rapid change. Weather variations lead to short-term alterations, but most pressures are man-controlled. Such may act as single factors, but often several factors combine, and change can result even when each separately is too slight to have a noticeable effect. Increased vegetation may increase flood hazard. Decreased or unsatisfactory vegetation may decrease conservation, amenity and sometimes angling value.