ir.bowen.edu.ng:8181/jspui/handle/123456789/387 These are articles published in journals by academics staff 2026-04-22T00:08:20Z ir.bowen.edu.ng:8181/jspui/handle/123456789/2035 Title: Condition factor and diet of Chrysichthys nigrodigitatus and Chrysichthys auratus (Siluriformes: Bagridae) from Aiba Reservoir, Iwo, Nigeria Authors: Atobatele, O. E.; Ugwumba, A. O. Abstract: Chrysichthys nigrodigitatus and C. auratus are important, highly valued and threatened freshwater species. To contribute with their ecological knowledge, the condition factor and diet of these two congeneric species were studied between April 2005 and April 2006. Food items of fish were evaluated by occurrence and numerical abundance methods, and the possible changes among sexes, seasons and sizes were considered. Results showed that generally C. nigrodigitatus were better conditioned than C. auratus. The males of C. nigrodigitatus and females of C. auratus were in better condition than their respective opposite sex throughout the year, and during the wet season compared to the dry. The food items of C. nigrodigitatus and C. auratus were similar and comprised twelve species belonging to five groups: Insecta (three species), Crustacea (five species), Arachnida (one species), Rotifera (one species) and Mollusca (two species). Other food items included fish scales, unidentified green eggs, plant parts, detritus and sand. Insecta and Crustacea dominated the food items in both species. For C. nigrodigitatus, insect consumption increased with fish size, while Crustacea items decreased (from 89.59% for 8.1cm - 12.0cm size class to 1.58% for 20.1cm - 26.0cm size class). However, while C. auratus smaller sized fish preferred Crustacea (98.72% for 8.1cm -12.0cm size class), larger sized fish had both groups in relatively similar amounts. Schoener Overlap Index for both species and between seasons is 1.00. Diet breadth ranged from 0.00-1.47 for C. nigrodigitatus and 0.00-1.32 for C. auratus. Food Richness ranged from 0.00-1.44 for both species. Gut Repletion Index for C. nigrodigitatus and C. auratus are 76.39% and 76.27% respectively. Although, there is considerable similarity and overlap in the utilization of food resource for both coexisting species, condition factor and feeding behavior suggest strategies to reduce intra- and interspecific competition. 2011-01-01T00:00:00Z ir.bowen.edu.ng:8181/jspui/handle/123456789/1483 Title: Soil fertility restoration techniques in sub-Saharan Africa using organic resources Authors: Omotayo, O. E.; Chukwuka, K. S. Abstract: Food security concerns are currently escalating in sub-Saharan Africa (SSA) due to poor soil management practices on the fragile soils. This review describes the role of organic resources acting both as amendments and fertilizers in improving soil nutrient status and productivity potentials in SSA. The use of organic resources has achieved significant strides in improving soil fertility in many agroecological zones in SSA. Balanced fertilization of soils through synchronized supply of adequate nutrients to growing crops as well as increasing soil organic matter content over the long term are major gains realized through application of organic resources. Constraints that limit utilization of organic based soil nutrient management systems were also highlighted; with the conclusion that more committed research activity and better adoption of developed technologies would lead to promotion and establishment of the gains of procuring and utilizing organic resources for soil fertility improvement in SSA. 2009-01-01T00:00:00Z ir.bowen.edu.ng:8181/jspui/handle/123456789/1464 Title: Distribution and Diversity of Bacteria in a Small Tropical Freshwater Body (Aiba Reservoir) in Iwo, Osun State, Nigeria. Authors: Atobatele, O. E.; Owoseni, A. A. Abstract: Environmentalists have become increasingly concerned about the pollution of surface waters. The Aiba reservoir is the second oldest impoundment of Osun river basin and provides potable water to Iwo community. The diversity of bacteria in the Aiba Reservoir was studied by collecting water samples from four locations within the reservoir to reflect human impacts during three different seasons. The most probable number (MPN) of bacteria at the different sampling locations during the sampling seasons, the total non-specific bacteria count, total coliform and Escherichia coli count were measured using the tube dilution and pour plate techniques. Significant differences were observed in various parameters of bacterial diversity. Water samples from all sampling points were contaminated with coliforms, the highest being 1100+ MPN/100ml in location D. the highest number of bacteria was isolated in June at all sampling locations. Seventy-nine bacteria belonging to sixteen genera and twenty-three species were isolated. The genus Bacillus was the most diverse with thirty-one isolates and eight species. Other genera isolated were Aeromonas, Citrobacter, Listeria, Proteus, Escherichia, Klebsiella, Alcaligenes, Enterobacter, Corynebacterium, Lactobacillus, Edwardsiella, Flavobacterium, Staphylococcus, Streptococcus and Acinetobacter. Of the 23 genera isolated 10 (43.5%) were Gram negative bacteria, 60% of which are coliform bacteria. Eight (61.5%) of the Gram positive bacteria belonged to the Genus Bacillus. The high bacteria count and the type/genera of bacteria isolated are indicative of contamination of the system with soil from agricultural runoff, domestic sewage and fish remains. This on the long run could lead to spread of infective diseases to the populace. 2012-01-01T00:00:00Z ir.bowen.edu.ng:8181/jspui/handle/123456789/1462 Title: Growth pattern and morphometric discrimination of two congeneric species of Chrysichthys, C. nigrodigitatus and C. auratus (Siluriformes, Bagridae), from a small tropical reservoir Authors: Atobatele, O. E. Abstract: This study reports the growth pattern and six percentage morphometric characters (relative to standard length) that could be used to discriminate small sizes of Chrysichthys nigrodigitatus and C. auratus from samples collected in Aiba Reservoir, Iwo, Nigeria 2013-01-01T00:00:00Z