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Research Journal of Environmental Sciences
Year: 2008  |  Volume: 2  |  Issue: 5  |  Page No.: 393 - 400

Survey of Macrovegetation and Physicochemical Parameters of Samaru Stream, Zaria Nigeria

F.A. Tiseer, Y. Tanimu and A.M. Chia    

Abstract: A survey was carried out from November to December 2003 and May to June 2004 to determine the current status of macrovegetation and physicochemical parameters of Samaru stream in Zaria (7° 38’E and 11° 11’N), Nigeria. Five sampling stations were chosen at approximately equal distances from each other along the stream length. Temperature readings were 19.5±1.05 and 29.0±0.67°C; pH 7.496±0.11 and 7.07±0.07; EC 328.1±63.92 and 364±75.37 μS cm-1; TDS 163.3±31.99 and 185.5±37.20 mg L-1; DO 6.05±0.51 and 4.03±0.49 mg L-1; NO3-N 1.37±0.17 and 5.32±0.90 mg L-1; PO4-P 136.0±53.07 and 42.3±4.74 mg L-1; BOD 0.89±0.22 and 0.32±0.07 mg L-1 and Transparency 0.00 and 0.36±0.06 m in the dry and wet season respectively. Fifty three macrophyte species were recorded belonging to 26 families during the entire study. Ageratum conyzoides was the most frequent (80%) of all species observed in both wet and dry season. Very few true aquatic species were recorded during the study, these comprised Hydrophilla auriculata, Jussiae ripens, J. decurrens, Polygonum limbatum, P. linigerum, Oryza barthi and Ipomoea aquatica. The occurrence of macrophytes in the stream responded directly to eutrophication. This is because higher number species occurred in the dry season which significantly correlated (p≤0.05) with higher nutrient levels in the same season.

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