Abstract
The streams selected for the study pass through deforested catchments, and even their riparian zones are devoid of trees. Due to low level of nutrients, the streams support reduced algal flora (14 genera; 35 species) and low epilithic algal biomass (0·07–1·14 mg chlorophylla m−2). Persistence of high N∶P atomic ratio at all sites suggests phosphorus limiting condition. Algal assay was used to determine the effects of nitrogen, phosphorus and trace element supplementation on algal growth potential of stream water. Addition of phosphorus significantly increased the cell yield of test alga,Selenastrum capricornutum, thereby confirming phosphorus limitation of algal growth in the selected streams.
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