Transport of nutrients from the Seybouse River to Annaba Bay (Algeria, SW Mediterranean)

Marine Pollution Bulletin
Omar Ramzi ZiouchMakhlouf Ounissi

Abstract

Freshwater and dissolved nutrient inputs that entered the lower Seybouse River estuary were assessed in 2012 through a fortnightly surface water sampling both at a lower river station and at the estuary outlet. The Seybouse estuary delivered annually 950 × 106 m3 of freshwater yielding 83 kg N km-2 yr-1 of N-NH4 and 12 kg P km-2 yr-1 of P-PO4. More than 2/3 of the annual inputs of freshwater, Si(OH)4 and NO3 entered the sea during the flooding event of late February 2012. Si-Si(OH)4 and N-NO3 yields in the Seybouse estuary represented <1/3 those of the Mediterranean rivers. Annaba Bay is subjected to highly polluted waters from the Seybouse estuary, with significant NH4 (72 ± 37 μmol L-1) and PO4 (7 ± 4 μmol L-1) amounts. However it is characterized by low Si(OH)4 (104 ± 43 μmol L-1) amounts. Alteration of Si:N:P ratios at this bay suggest potential risk of eutrophication, except during and weeks after flood episodes.

Citations

Jul 22, 2020·Environmental Science and Pollution Research International·Amel HamdaniNedjoua Zaidi
Jul 5, 2021·Environmental Science and Pollution Research International·Imen LaouatiKheireddine Ouali

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