Assessment of trace metal contamination in mangrove ecosystems from Senegal, West Africa

Autor: L. Tito de Morais, E. Rozuel-Chartier, Omar Thiom Thiaw, R. N’Gom-Kâ, F. Le Loc'h, Jean-Francois Chiffoleau, Samba Kâ, Dominique Auger, Nathalie Bodin
Přispěvatelé: UMR 212 EME 'écosystèmes marins exploités' (EME), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Montpellier (UM), Institut Universitaire de Pêche et Aquaculture (IUPA), Université Cheikh Anta Diop [Dakar, Sénégal] (UCAD), Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Réponses adaptatives des populations et des peuplements de poissons aux pressions de l'environnement (RAP), Laboratoire Biogéochimie des Contaminants Métalliques (LBCM), Biogéochimie et Ecotoxicologie (BE), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre atlantique, Nantes
Rok vydání: 2013
Předmět:
Delta
Geologic Sediments
Environmental Engineering
010504 meteorology & atmospheric sciences
Health
Toxicology and Mutagenesis
Gastropoda
010501 environmental sciences
01 natural sciences
[SDV.EE.ECO]Life Sciences [q-bio]/Ecology
environment/Ecosystems
Animals
Environmental Chemistry
Trace metal
14. Life underwater
Mangrove
Ecosystem
Shellfish
0105 earth and related environmental sciences
geography
geography.geographical_feature_category
Bioindicator
Ecology
Estuary
Public Health
Environmental and Occupational Health
Sediment
Biota
General Medicine
General Chemistry
Pollution
Senegal
6. Clean water
Bivalvia
Heavy metals
Metals
Wetlands
Environmental chemistry
Bioaccumulation
Environmental science
[SDE.BE]Environmental Sciences/Biodiversity and Ecology
Water Pollutants
Chemical
Environmental Monitoring
Zdroj: Chemosphere
Chemosphere, 2013, 90 (2), pp.150-157. ⟨10.1016/j.chemosphere.2012.06.019⟩
Chemosphere, Elsevier, 2013, 90 (2), pp.150-157. ⟨10.1016/j.chemosphere.2012.06.019⟩
ISSN: 0045-6535
DOI: 10.1016/j.chemosphere.2012.06.019
Popis: International audience; The inorganic contamination of sediment and harvested molluscs was investigated in the mangrove environment of Southern West Senegal. Trace metals were analysed in surface sediments, two bivalves (Arca senilis and Crassostera gasar) and three gastropods (Conus spp., Hexaplex duplex and Pugilina morio) collected from four stations: Dionewar, Niodor and Falia localised in the Saloum Delta, and Fadiouth from the Petite Côte. A geochemical normalisation approach by using aluminium allowed for discrimination of sediment contamination among sites. Indeed, Fadiouth appeared highly contaminated with Cd, Hg and Ni compared to the Saloum Delta. For all mangrove sites, trace metals exhibited significant higher concentrations (on a dry weight basis) in shellfish compared to sediments, excepted for Ni and Pb. The distribution pattern followed a similar global trend in molluscs regardless of the spatio-temporal variability, with the predominance of Zn (80% of total metals) followed by Cu and Cd. However, strong differences of metal bioavailability and bioaccumulation in biota were demonstrated, revealing the requirement of employing a suite of organism bioindicators to monitor metal contamination in mangrove ecosystems. From an ecotoxicological point of view, trace metal levels in sediments from the Petite Côte and the Sine-Saloum Estuary were below the effects range-low (ERL) threshold limit of the sediment quality guidelines for adverse biological effects (SQGs). On the opposite, some concerns about Cd contamination of edible shellfish from Southern West Senegal were highlighted, from both the safety point of view of local populations' health, and the chemical quality point of view of exported resources.
Databáze: OpenAIRE
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