The distribution ofStigeoclonium tenueKütz. in South Wales in relation to its use as an indicator of organic pollution

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Abstract
The distribution and frequency of Stigeoclonium tenue Kütz. in some South Wales rivers were studied for 12 months to assess the value of the alga as an indicator of organic pollution. It colonised organically polluted areas at most times of the year, and generally in greater abundance as compared with cleaner stations. Tolerance was observed over a wide range of a number of environmental factors: pH, water temperature, suspended solids content, flow, nitrate, nitrite and ammonia nitrogen, phosphate phosphorus, dissolved oxygen, B.O.D., electrical conductivity, chloride, total hardness, magnesium hardness and calcium hardness. Greatest tolerance was expressed mainly in the spring months when the organism became widely distributed in diverse habitats ranging from organically polluted to fairly clean conditions. Some precautions in the use of S. tenue as an indicator of organic pollution are therefore suggested. In particular, the frequency of the organism should be noted especially in spring, since organic conditions are suspect only when the alga is highly abundant.