Department Of Zoology

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https://ir.unilag.edu.ng/handle/123456789/3397
The Department offers courses which will enable the Zoology student acquire a considerable knowledge of the animal kingdom such as classification, anatomy, physiology, evolution, phylogenetic relationship and adaptations to environment of the major animal group from protozoa to mammals. The foci of the programme are General Zoology, Applied Entomology, Parasitology, Ecotoxicology and Conservation.

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Browsing Department Of Zoology by Subject "Bioaccumulation"

Now showing 1 - 3 of 3
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    Open Access
    Diversity of the Edible Fishes of the Lagos Lagoon, Nigeria and the Public Health Concerns Based on their Lead (Pb) Content.
    (Academic Journals, 2012-02-09) Ajagbe, F.E; Osibona, A.O; Otitoloju, A.A
    In this study, a total of eighteen fish species were recorded in the Lagos Lagoon, Nigeria during a one year survey. Among the animals species recorded, the following, Galeoides decadactylus, Dentex gibbosus, Elops lacerta, Scomber japonicus, Ethmalosa fimbriata, Lutjanus agennes, Caranx senegallus, Callinectes amnicola, Paeneus notialis and Mytilus edulis were considered to be abundant in the Lagos lagoon based on the frequency of occurrence in fishermen catches. The analysis of the lead content in muscles of the edible fisheries revealed that the animals accumulated measurable quantity of lead in the edible parts. The level of lead detected in most (12 out of 18 species) of the fisheries species were found to be lower than the daily allowable concentration of 2.0 μg/g standard recommended by the World Health Organisation (WHO). Fishes species with high level of lead in their edible parts include Senegal jack, C. senegallus (2.188 μg/g), Bobo croaker, Pseudotolithus elongatus (2.024 μg/g), Cassava croaker, Pseudotolithus senegalensis (3.157 μg/g), crayfish, Penaeus notialis (25.46μg/g), edible mussel, Mytilus edulis (17.69 μg/g) and crab, Callinectes amnicola (10.19 μg/g). The mean levels of lead in Mytilus edulis, Penaeus notialis, and Callinectes amnicola collected from the Lagos lagoon were about 8 to 24 times higher than the WHO daily allowable standards for lead in sea foods and are therefore unsafe for human consumption. The need for regular monitoring of the levels of metals and other contaminants in edible fisheries resources and collaboration between environmental, health and food agencies to avert human tragedies due to lead accumulation are discussed
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    Open Access
    Estimation of Polybrominated Diphenyl Ethers (PBDEs) Contamination Levels in Sediment and Crab (Callinectes amnicola) from selected area of Epe Lagoon
    (2020) Osuala F.I.; Abiodun O.A.; Olaitan A.T.
    Abstract: Polybrominated diphenyl ethers (PBDEs) are flame retardant that persist, bioaccumulate and biomagnify in aquatic organisms with accompanied deleterious effect. The PBDEs levels was assessed in sediments and Crabs (Callinectes amnicola) collected from Oro-oguro (stations 1) and Orugbo (stations 2) in Epe lagoon, Nigeria. Samples were analyzed using Gas Chromatography coupled with Electron Capture Detector (GC-ECD). Sediments BDE (28, 47, and 183) were detected in both stations at concentrations lower than Federal Environmental Quality Guidelines for PBDEs Environment Canada (150 ng/g) and European Union (310 ng/g). The total mean concentration of PBDEs ranged from 37.77 – 67.66 ng/g) in station 2 and 1, respectively. BDE 28 had the highest concentration (32.20 ng/g) of the congeners detected while congener BDE 47 had the lowest concentration (3.25 ng/g). BDE 7, BDE 28, BDE 47 and BDE 99 were detected in C. amnicola sampled from both stations. BDE 28 was highest in stations 1 and 2 (144.79 and 2611.29 ng/g), respectively which was significantly higher relative to the Canada Environmental Quality Guidelines (120 ng/g). The total PBDEs concentration was higher in station 2 (2730.67 ng/g) than station 1 (183.18 ng/g). Total organic carbon was higher in sediment (2.496 mg/g) from station 2 than station 1 (1.872 mg/g). Derivation of Biota-Sediment Accumulation Factor (BSAF) for BDE (7 and 28) congeners was greater than 1 in both stations. Thus, a reflection of an unhealthy state of the environment that calls for regular monitoring to ensure conservation of the inhabitants.
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    Open Access
    Seasonal Occurrences and Risk Assessment of Phthalate Esters in Sediment, Water and Biota of Two Sub Saharan Rivers.
    (2021) Germaine A.O.; Saliu J.K.; Osuala F.I.
    The global environmental occurrence of phthalates is inevitable due to their substantial annual production and consumption rate of approximately 5 million tonnes. This study aimed to evaluate the seasonal occurrence of selected phthalate esters congeners in sediment, water, and biota in two freshwater bodies (River Owena and River Ogbese) in Nigeria, and to calculate their ecological risks they pose to aquatic organisms. Dibutyl-phthalate (DBP), di-2-ethylhexyl phthalate (DEHP), and dimethyl-phthalate had an all-year presence in various environmental matrices. DBP was the most prevalent phthalate congener in all environmental matrices with a considerable potential to bioaccumulate in fsh tissues. The estimated risk quotient calculated revealed that DBP and DEHP showed a high risk to algae, invertebrates, and fsh populations in both freshwater bodies. It is recommended that more comprehensive monitoring campaigns in freshwater bodies be implemented, especially in areas with high anthropogenic activities, to prevent deterioration of aquatic life.