Abstract
An assessment was made of the effects of drainage from five refuse-tips upon the biology of the receiving watercourses. Three refuse-tips were found to be the cause of gross pollution of the stream, resulting in massive growths of sewage fungus Leptomitus lacteus, with the invertebrate community dominated by the oligochaete Nais elinguis over a considerable distance downstream. Chironomidae and the oligochaetes Tubifex ignotus, T. tubifex and Lumbriculus variegata were frequent immediately below discharges. The absence of many invertebrate species appears to be associated with the presence of massive growths of sewage fungus in the stream trapping silt and blocking the interstices between stones, and the increase in pollution.
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