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Assessment of two persistent bioaccumulative toxicants in the UNESCO protected river of Osun-Osogbo, Nigeria

Ecological Processes 2017年第1期6卷 323-330页

作者： Emmanuel O.Akindele Godwin O.Olutona Oyeshina G.Oyeku akinkunle v.adeniyi Department of Zoology Obafemi Awolowo UniversityIle-IfeNigeria Department of Chemistry and Industrial Chemistry Bowen UniversityIwoNigeria Department of Biological Sciences Bowen UniversityIwoNigeria Institute of Ecology and Environmental Studies Obafemi Awolowo UniversityIle-IfeNigeria

Introduction:Osun River dissecting the Osun-Osogbo Sacred Grove,though inscribed on the World Heritage List,has been rarely assessed for biodiversity values or *** this study,we investigated the concentrations of Cu and Zn in the benthic sediments and two dominant gastropod species(Melanoides tuberculata and Lanistes varicus)of the Osun *** sediment and gastropod samples were collected on quarterly basis from June 2015 to March 2016 along the longitudinal stretch of the *** samples were digested and analysed for Cu and Zn using the atomic absorption ***:With the exception of September sampling period,the two metals recorded higher values in the animals than in the ***(1.23±0.81μg/g)was much lower(pvein,Cu was significantly lower(pvalues than their average concentrations in the Earth’s crust as well as the recommended limits for freshwater ***,*** recorded higher bioaccumulation factor than ***:Findings from this study suggest that both metals posed no toxicological risk to the freshwater system of Osun *** of both metals in the sediments as well as their accumulation factors in both gastropod species were indicative of an unimpacted freshwater system.

关键词： :Accumulation Benthic sediments Contamination Ecotoxicology Heavy metals Freshwater gastropods

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