Zoology-Scholarly Publications

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Browsing Zoology-Scholarly Publications by Author "Abiodun O.A."

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    Open Access
    3. Osuala, Fidelia I., Abiodun, Olushola A., OyelBiodiversity of Fauna and Heavy Metals Assessment in Selected Areas of the University of Lagos Akoka Campus, Lagos, Nigeria
    (2020) Osuala F.I.; Abiodun O.A.; Humphrey O.F.; Bisola G.
    The biodiversity of terrestrial fauna and assessment of some heavy metals cadmium (Cd), chromium (Cr), cobalt (Co), lead (Pb), nickel (Ni) and manganese (Mn) concentrations in soil samples were investigated in selected areas of the University of Lagos Akoka campus. Unicam - 929 Atomic Absorption Spectrophotometer (AAS) was used for heavy metals analysis and biodiversity index was calculated with Margalef, Shanon-Weiner and Simpson index. On the basis of the Shanon-Weiner index, Zoological garden had the highest species richness (2.75) while High-Rise (1.71) had the lowest species diversity. On the basis of the Simpson index (1-D), Faculty of Science had the highest species diversity (0.95) while High-Rise had the lowest diversity (0.75). Formicidae (21.60%), Gecarcinidae (13.77%) and Libellulidae (13.51%) were the families with the highest relative abundance in University of Lagos while Cercopithecidae (0.26%), Elapidae (0.34%) and Gryllidae (0.34%) were the families with least relative abundance. The result of the soil texture (particle size) of the various sampled zones indicated that sand is the dominant component with a mix of loam. Heavy metal mean concentrations of the soil samples from the University of Lagos indicated the presence of Pb (0.17 - 29.67 mg/kg), Ni (0.59 - 6.63 mg/kg), Mn (72.72 - 398.63 mg/kg), Cr (0.01 - 16.23 mg/kg), Cd (0.20 - 0.87 mg/kg) and Co (0.17 – 6.52 mg/kg). All heavy metals detected were below Federal Ministry of Environment (FMEnv) and European Union (EU) permissible limit for heavy metals in soils except Mn. Though, Mn is biologically important with low toxicity, there is need for consistent monitoring of the heavy metals so as not to pose a threat to the biodiversity of the study area.
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    Open Access
    CONTAMINATION LEVELS OF ORGANOCHLORINE PESTICIDES IN Tympanotonus fuscatus AND SEDIMENT OF LAGOS LAGOON, NIGERIA
    (2020) Osuala F.I.; Abiodun O.A.; Alebiosu E.A.
    The wide use and application of Organochlorine pesticides (OCPs) is a menace to non-target aquatic biota. The study evaluated the levels of OCPs residues in Tympanotonus fuscatus and sediment within three (3) selected areas of the Lagos Lagoon, Nigeria using Gas Chromatography coupled with Electron Capture Detector (GC-ECD). The mean concentration of OCP residues detected in T. fuscatus and sediments were Lindane, Diedrin, Aldrin, Endosulfan (isomers alpha and beta endosulfan), and DDT (isomers orthopara and para-para DDT). Generally, the total OCP concentration was higher in T. fuscatus than in sediments while stations 1 had the highest concentration of ∑ OCPs in both tissue and sediment samples followed by stations 2 and 3. Endosulfan concentration was the highest followed by Dieldrin > DDT > HCH > Lindane in decending order. In sediment, the mean concentration of Lindane ranged from Not Detected (ND) to 342.0 ng g-1 while HCH ranged from 262 - 818 ng g-1. Total Endosulfan ranged from 776 – 4849 ng g-1 while DDT ranged from 349 – 2211ng g-1. Bioaccumulation Factor (BAF) values in descending order was as follows: Endosulfan > Beta _BHC > Endrin aldehyde with the highest BAF values recorded from Iddo (3). Additionally, concentrations of Dieldrin > Heptachlor > DDT were recorded in descending order at Unilag Lagoon front that exceeded the FEPA and USEPA Limit (BAF > 1); an indication that harmful effects are likely for aquatic species. Thus warrants proper and consistent monitoring of OCPs in the Lagos Lagoon.
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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
    Micropellet Particles: A Vector of Hydrophobic Endocrine Disrupting Chemicals in Lagos Lagoon
    (2019) Abiodun O.A.; Osuala F.I.; Otitoloju A.A.; Carine M.D.; Fotsing; Derek T.N.
    Introduction: The occurrence of plastic waste materials in the aquatic environment is receiving enormous attention all over the world due to its negative impacts on aquatic organisms. Micropellet litters have been found to adsorb and absorbs persistent organic endocrine disrupting chemicals (EDCs). Endocrine disrupting chemicals are recognized toxic chemicals to human and organisms. Aim: This study quantifies occurrence of micropellet particles in Lagos Lagoon and their EDCs contents. Methodology: The sampling was conducted from 2016 to 2018 at eight sampling locations with three points established in each of the sampling station. The chemical analysis of EDCs was conducted by gas chromatography coupled with electron capture detector and flame ionization detector. Results: Micropellet particles occurrence was highest in surface water (67%) compared to (33%) in sediment during the period of sampling. EDCs contents reflect contamination of PCBs and PAHs in the extracted micropellet particles. Some sampling stations contained relatively higher PAHs concentrations but very low concentration of PCBs. Conclusion: Since, micropellet particles and EDCs cannot be removed completely from the aquatic environment; reduction of impending hazards ought to rely on curtailing disposal of plastic materials and sensitizing the populace on general disposal methods in order to minimize interaction of plastic particles with EDCs which are likely to pose significant effects on aquatic fauna.
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    Open Access
    Polybrominated Diphenyl Ethers in Sediments and their Bioaccumulation in tissues of the sessile Bivalves, Crassostrea tulipa from some selected area of Lagos Lagoon, Nigeria
    (2019) Osuala F.I.; Abiodun O.A.; Olalekan M.Y.
    Bioaccumulation of Polybrominated Diphenyl Ethers (PBDEs) was investigated in sediment and tissues of the Oyster (Crassostrea tulipa) from Unilag Lagoon Front, Makoko and Oworonshoki sampling stations within the Lagos Lagoon, Nigeria using Gas Chromatography coupled with Electron Capture Detector (GC-ECD). The samples collected were analyzed for PBDEs congeners of BDE 28, 47, 99, 100, 153, 154, 183 and 209. The results of the mean concentration of PBDE congeners detected in sediment and Oyster tissue were BDE 28, 47,183 and BDE 28, 47, 153 respectively, in all sampled stations, which was significantly higher (P < 0.05) comparing with Canadian Federal Environmental Quality Guidelines for PBDEs. Oworonshoki station had the highest concentration of total PBDEs (600.07 ng/g dry weight) while Unilag (386.43 ng/g dry weight) had the least concentration. BDE 28 was detected highest in all stations while congener BDE 183 was lowest in concentration. BDE 28 (70%) was the only congener distributed in the Oyster and sediment samples collected from all the stations and was significantly higher when compared with the Federal Environmental Quality Guidelines for PBDEs. Total PBDE concentration in Oysters showed that Oworonshoki had the highest concentration (615.44 ng/g) while Makoko showed the least (336.22 ng/g). The Biota Sediment Accumulation Factors for BDE 28 (1.181) and BDE 47 (4.990) were greater than 1, an indication of bioaccumulation. The present study established a reflection of the environmental health of the selected sampled areas and therefore, a useful tool for monitoring of PBDEs pollution.