Abstract
The physico-chemistry, biodiversity and biomarker responses in Tympanotonus fuscatu s collected from a mangrove ecosystem in the outskirt of Lagos recovering from the impact of refined petroleum spill and fire outbreak was assessed using a combination of ecotoxicological techniques. The impacted water and sediment were mostly acidic (pH Fe>Zn>Mn>Pb in water and Fe>Zn>Cu>Pb in the sediment. These physico-chemical changes culminated in low floral and faunal diversity and a preponderance of the invasive and tolerant periwinkles, Tympanotonus fuscatu s and Pachymelania aurita. Biomarker studies on the viscera of T. fuscatus re vealed some level of DNA damage, and low levels of oxidative stress emphasized Overall, there were no significant changes (p>0.05) in antioxidant enzymes (reduced gluthathione, superoxide dismutase and catalase) and lipid peroxidation product, malondialdehyde (MDA) assayed T. fu scatu s collected from the impacted sites compared to the control site. This study provides evidence for the tolerance of the dominant T. fuscatus to the stressed ecosystem and makes a case for the use of biomarkers of stress, together with chemical analysis incorporated into traditional biodiversity assessments for monitoring ecosystem recovery after an oil spill incidence.
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