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Seasonality of Hg dynamics in the Ebrié Lagoon (Côte d’Ivoire) ecosystem: influence of biogeochemical factors

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Abstract

This study addresses the different biogeochemical parameters that control the dynamics of Hg, which is a less-studied metal in the Ebrié Lagoon. During two hydrological seasons, the dry season and the rainy season, we regularly sampled and analysed various compartments (e.g. sediments and fishes (Tilapia sp.)) of the lagoon. Thus, the physicochemical parameters were measured in situ (e.g. temperature, pH, salinity, redox potential and dissolved oxygen, total dissolved organic carbon, nitrates and sulphates), and the microbiological parameters (e.g. cultivable cells, total enzymatic activity and catabolic activity) were measured to establish the seasonal variations in the links between Hg and biogeochemical parameters through multivariate statistical analyses. The bioavailability of Hg from an unpolluted site was studied by comparing the ratios of fish and sediment. The results indicated that the seasons influenced the different biogeochemical factors, although for some factors, the variations were not significant. This influence was more pronounced in the dry season than in the rainy season. The impact of microbial activities and organic matter on Hg dynamics was observed in all seasons. However, other factors, such as pH, temperature, salinity, Eh and sulphates, influenced the dynamics of Hg only in the dry season.

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Acknowledgements

This work would not have been possible without the logistical support provided by two laboratories in France and Côte d’Ivoire. We would like to thank Regis Moilleron for providing access to his hydrobiology lab for experimentation. We gratefully acknowledge Alexandre Livet for his analytical assistance.

Funding

This study is financially supported by the PASRES program of the Swiss Center for Scientific Research since 2016.

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Authors and Affiliations

  1. Unité de Formation et Recherche des Sciences et Gestion de l’Environnement, Université Nangui Abrogoua, 02 BP 801 Abidjan, 02, Abidjan, Côte d’Ivoire

    Lou Brou Cécile Kouame & Bi Tié Albert Goula

  2. UMR MA 102 Laboratoire Eau Environnement et Système Urbain, Université Paris-Est Créteil, 61 Avenue du Général de Gaulle, 94010, Créteil Cedex, France

    Lou Brou Cécile Kouame, Vanessa Alphonse & Clarisse Balland-Bolou-Bi

  3. Département des Sciences du Sol, Université Félix Houphouët-Boigny, Unité de Formation et Recherche des Sciences de la Terre et des Ressources Minières, 22 BP 582 Abidjan, 22, Abidjan, Côte d’Ivoire

    Emile B. Bolou Bi

  4. Centre de Recherches Océanologiques (CRO), Laboratoire de Physique et Géologie Marine, B.P.V. 18, Abidjan, Côte d’Ivoire

    Natchia Aka

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  1. Lou Brou Cécile Kouame
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Kouame, L.B.C., Bolou Bi, E.B., Aka, N. et al. Seasonality of Hg dynamics in the Ebrié Lagoon (Côte d’Ivoire) ecosystem: influence of biogeochemical factors. Environ Sci Pollut Res 27, 19810–19825 (2020). https://doi.org/10.1007/s11356-020-08471-3

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