Article Dans Une Revue Journal of Marine Science and Engineering Année : 2025

First Record of Lepidodinium chlorophorum and the Associated Phytoplankton Community Responsible of the Green Tide South Western Mediterranean Sea (Hammam-Lif, Tunisia)

Noussaiba Salhi
  • Fonction : Auteur
Christine Felix
Aziz Hafferssas
  • Fonction : Auteur
Imen Laadouze
  • Fonction : Auteur
Neila Saidi

Résumé

The bloom-forming dinoflagellates and euglenophyceae were observed in the coastal waters of Hammam-Lif (Southern Mediterranean), during a green tide event on 3 June 2023. The bloom was dominated by Lepidodinium chlorophorum, identified through ribotyping with densities reaching 2.3 × 107 cells·L−1. Euglena spp. and Eutrepsiella spp. contributed to the discoloration, with abundances up to 2.9 × 107 cells·L−1. Environmental data revealed significant depletion of nitrite and nitrate, coinciding with a rapid increase in sunlight duration, likely promoting the proliferation of L. chlorophorum and euglenophyceae. By 5 June, two days after the bloom, nutrient stocks were exhausted. Diatoms appeared limited by low silicate concentrations (<0.05 µmol·L−1), while dissolved inorganic phosphate and Nitrogen-ammonia were elevated during the bloom (0.88 and 4.8 µmol·L−1, respectively), then decreased significantly afterward (0.23 and 1.06 µmol·L−1, respectively). Low salinity (34.0) indicated substantial freshwater input from the Meliane River, likely contributing to nutrient enrichment and bloom initiation. After the event, phytoplankton abundance and chlorophyll levels declined, with a shift from dinoflagellates to diatoms. The accumulation of pigments (chlorophyll b and carotenoids) and the presence of Mycosporine-like amino acids (MAAs) during and after the bloom suggest that UV radiation and Nitrogen-ammonia were key drivers of this green tide.

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hal-05480241 , version 1 (29-01-2026)

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Noussaiba Salhi, Marc Pagano, Christine Felix, Aziz Hafferssas, Imen Laadouze, et al.. First Record of Lepidodinium chlorophorum and the Associated Phytoplankton Community Responsible of the Green Tide South Western Mediterranean Sea (Hammam-Lif, Tunisia). Journal of Marine Science and Engineering, 2025, 13 (10), pp.1982. ⟨10.3390/jmse13101982⟩. ⟨hal-05480241⟩
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