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Assessment of old eutrophication in the sediments of Marchica Lagoon (a post-restored lagoon, Mediterranean): The role of geochemistry and granulometry of the sediments

Author

Listed:
  • Abderrahmane Rahhou
  • Mostafa Layachi

    (Regional Center of INRH-Nador (National Institute of Fisheries Research), Morocco)

  • Mustapha Akodad

    (Laboratory of Biology, Geosciences, Physics and Environment (OLMAN-LBGPE), Multidisciplinary Faculty, Nador, Morocco)

  • Najib El Ouamari

    (Regional Center of INRH-Nador (National Institute of Fisheries Research), Morocco)

  • Asmae Aknaf

    (Laboratory of Biology, Geosciences, Physics and Environment (OLMAN-LBGPE), Multidisciplinary Faculty, Nador, Morocco)

  • Ali Skalli

    (Laboratory of Biology, Geosciences, Physics and Environment (OLMAN-LBGPE), Multidisciplinary Faculty, Nador, Morocco)

  • Hamza Loukili

    (Laboratory of Biology, Geosciences, Physics and Environment (OLMAN-LBGPE), Multidisciplinary Faculty, Nador, Morocco)

  • Youssef Bernichi

    (GAT, Faculty of Sciences and Techniques of Tangier, University Abdelmalek Essaadi, Tétouan, Morocco)

  • Brahim Oudra

    (Water, Biodiversity and Climate Change Laboratory, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech, Morocco)

  • Mourad Baghour

    (Laboratory of Biology, Geosciences, Physics and Environment (OLMAN-LBGPE), Multidisciplinary Faculty, Nador, Morocco)

Abstract

The aim of this study is to present the seasonal variation of organic matter (OM), total organic carbon (TOC), total nitrogen (TN), and total phosphorus (TP) in the bottom sediments of Marchica Lagoon, a post-restorated lagoon located in the Moroccan Mediterranean, and to estimate the potential role of the geochemistry and granulometry of bottom sediments in the retention of old eutrophication. The organic index of bottom sediment was found generally higher in old-eutrophic and enclosed areas. The surface sediments show variable levels of OM, TOC, TP, and TN; high in some cases (12.3%, 6.71%, 0.70%, and 0.30% respectively). These high levels were recorded in the central part of the lagoon and in areas subjected to high anthropogenic pressure, including wastewater discharges. Our results indicated that sediments are an excellent immobilizer of organic matter (C, N, and P), although, there was no correlation between sediment grain size and organic matter content. The absence of correlation might be explained by currentology and hydrodynamics, but also by the bathymetry of the lagoon. Therefore, sediments must be implicated in any lagoon restoration strategy and the site development plan.

Suggested Citation

  • Abderrahmane Rahhou & Mostafa Layachi & Mustapha Akodad & Najib El Ouamari & Asmae Aknaf & Ali Skalli & Hamza Loukili & Youssef Bernichi & Brahim Oudra & Mourad Baghour, 2023. "Assessment of old eutrophication in the sediments of Marchica Lagoon (a post-restored lagoon, Mediterranean): The role of geochemistry and granulometry of the sediments," Soil and Water Research, Czech Academy of Agricultural Sciences, vol. 18(3), pages 169-180.
    • Handle: RePEc:caa:jnlswr:v:18:y:2023:i:3:id:142-2022-swr
    DOI: 10.17221/142/2022-SWR
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    References listed on IDEAS

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    1. Aleksandra Ziemińska-Stolarska & Ewa Imbierowicz & Marcin Jaskulski & Aleksander Szmidt, 2020. "Assessment of the Chemical State of Bottom Sediments in the Eutrophied Dam Reservoir in Poland," IJERPH, MDPI, vol. 17(10), pages 1-19, May.
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