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Articles by A.M. Chia
Total Records ( 2 ) for A.M. Chia
  F.A. Tiseer , Y. Tanimu and A.M. Chia
  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.
  A.M. Chia , D.S. Abolude , Z. Ladan , O. Akanbi and A. Kalaboms
  Evidence from research in most countries of the world has shown that Cyanobacteria blooms could exhibit acute and chronic toxicity to man and animals alike. Despite the availability of records from other countries of the world, there is no information on the occurrence of these toxins in Northern Nigeria. This study reports the findings of a survey for the occurrence of microcystins in aquatic ecosystems in Zaria Northern Nigeria, using Enzyme Linked Immunosorbent Assay (ELISA) based methods. Five out of the 15 aquatic systems surveyed had microcystins concentrations higher than the acceptable limits (1 μg L-1) for portable drinking water. A total of eight Cyanobacteria species were recorded in this survey namely: Anabaena sp., Microcystis sp., Spirulina sp., Merismopedium sp., Gloetrichia sp., Cylindrospermopsis sp. and Anabaenopsis sp. In all the water bodies surveyed Anabaena sp. and Microcystis sp. had the highest frequency of occurrence and biomass (No. of cells per litre of water).
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