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Articles by Francis O. Arimoro
Total Records ( 3 ) for Francis O. Arimoro
  Francis O. Arimoro , Robert B. Ikomi and Erebe Efemuna
  To understand environmental conditions in River Ase Niger Delta, Nigeria, a study was carried out to assess the faunistic composition of macroinvertebrates as well as the water quality status of the river between the months March and August 2006. Two sampling sites each 25 m long were selected along a 20 km stretch of the stream. Water temperature, flow velocity, dissolved oxygen, pH, conductivity, total alkalinity and phosphates were similar in both stations sampled. BOD(5), water depth and nitrates were significantly higher in station I and showed wide temporal variation. Pearson correlation coefficient analysis indicated temporal trends in macroinvertebrate density and community composition. This was related to changes in environmental characteristics of the river especially BOD5 and amount of nutrients. These factors produced spatial and temporal heterogeneity and exerted major influence on the macroinvertebrate communities. Thirty-six morphologically distinct taxa representing eleven orders were recorded. The most abundant group was Coleoptera, which made up 38.5% of the total number of macroinvertebrates collected followed by Diptera which accounted for 29.3% of the total. Dugesia (Planaria), Agraylea (Trichoptera) and aquatic mites (Hydracarina) were only sporadically present. Analysis of faunal similarity using Jaccard`s similarity index showed that the fauna of both stations were dissimilar with station II recording comparatively high abundance and diversity of macroinvertebrates. The differences observed could be attributed to the nature of the habitat, general water conditions and substratum at the sites sampled.
  Francis O. Arimoro , Chukwuji M.A. Iwegbue and Ogheneghalome Osiobe
  The effect of industrial wastewater on the physical and chemical characteristics of Warri River, a coastal water body in the Niger Delta area of Nigeria was carried out for eight months spanning from October 2005 to May 2006. Three sampling points were chosen along the river corresponding to the locations were notable industries discharges are drained from the water shed into the river. Two reference points, upstream (Station 1) and downstream (Station 5) were also selected along the watercourse. The effluents discharged into stations 2, 3 and 4 led to slight increase in the acidic pH (6.16-7.73), high BOD values (10.8-54.4 mg L-1), including substantial increase in COD values (20-80 mg L-1), Turbidity values 94.5-18.6 Ntu) and total dissolved solids (165-898 mg L-1). Oil and grease levels were elevated in station 2 (3.42-17.9 mg L-1). This is as expected owing to its location close to a nearby fuel station. Analysis of variance (ANOVA) result revealed that turbidity, TDS, TSS, Electrical conductivity, salinity, BOD, COD, Phosphate, Ammonia, Iron and Copper were significantly different among the various stations sampled. The upstream station and downstream reference sites recorded lower values of these parameters. Seasonality did not affect much of the parameters except for Ammonia, TSS and TDS that were significantly different among the various sampling months. The study underscores the need for immediate remediation programmes to ameliorate the poor water status of the sections of the river sampled.
  Francis O. Arimoro and Kabir M. Adamu
  The acute toxicity of Water Soluble Fraction (WSF) of crude oil on Chironomus and mosquito larvae were evaluated to determine its effect on their survival rate. The larvae were exposed to acute concentration of WSF of crude oil (20.0, 10.0, 5.0 and 0.0 ml L-1) during the 48 h exposure in a static bioassay medium. Mortality was found to increase with exposure time and concentration. The 48 h Median Lethal Concentration (MLC) were 5.75 and 6.61 ml L-1 for mosquito and Chironomus larvae, respectively. However, the 48 h Median Lethal Time (MLT) for the different concentrations were 18.20 h for 20 ml L-1, 28.20 h for 10 ml L-1 and 48 h for 5 ml L-1 and 26.80 and 41.80 h for 20 and 10 ml L-1, respectively. Comparatively, mosquito larvae were more sensitive to the WSF of crude oil compared to the Chironomus larvae as shown in this finding.
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