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Boudriga I, Poindron C, Khammeri Y, Zouari AB, Rossi V, Thyssen M, Desboeufs K, Bel Hassen M. Impact of atmospheric deposition on the dynamics of ultraphytoplanktonic populations in the Gulf of Gabès during an intense dust event (MERITE-HIPPOCAMPE campaign). Mar Pollut Bull 2024; 200:116059. [PMID: 38335628 DOI: 10.1016/j.marpolbul.2024.116059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 12/07/2023] [Accepted: 01/17/2024] [Indexed: 02/12/2024]
Abstract
The ultraphytoplankton composition and dynamics were assessed during a Saharan dust event occurring off the southern Tunisian coasts during the MERITE-HIPPOCAMPE Trans-Mediterranean oceanographic cruise. The composition of atmospheric dust was characterized in terms of nutriments and trace metals. Data-assimilative hydrodynamic model revealed no differences in the hydrological features along the sampling track and almost no water transport occurred during the period of atmospheric deposition. Dust deposition increased the growth rates and the productivity of the major phytoplanktonic cytometric groups, resulting in the highest surface biomass along the Mediterranean transect. One group, distinguished by low fluorescence and nanoplanktonic size, reacted to dust deposition within hours, exhibiting the highest growth rate and net productivity. The dust composition showed a substantial enrichment with organic phosphorous representing (56 % of Total phosphorus) and trace metals mainly Fe, Mn and V.
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Affiliation(s)
- Ismail Boudriga
- Institut National des Sciences et Technologies de la Mer (INSTM), 28, rue 2 mars 1934, Salammbô 2025, Tunisia.
| | - Charlotte Poindron
- Université Paris Cité and Univ Paris Est Creteil, CNRS, LISA, F-75013 Paris, France
| | - Yosra Khammeri
- Institut National des Sciences et Technologies de la Mer (INSTM), 28, rue 2 mars 1934, Salammbô 2025, Tunisia
| | - Amel Bellaaj Zouari
- Institut National des Sciences et Technologies de la Mer (INSTM), 28, rue 2 mars 1934, Salammbô 2025, Tunisia
| | - Vincent Rossi
- Aix Marseille Univ., Université de Toulon, CNRS, IRD, MIO UM 110, 13288 Marseille, France
| | - Melilotus Thyssen
- Aix Marseille Univ., Université de Toulon, CNRS, IRD, MIO UM 110, 13288 Marseille, France
| | - Karine Desboeufs
- Université Paris Cité and Univ Paris Est Creteil, CNRS, LISA, F-75013 Paris, France
| | - Malika Bel Hassen
- Institut National des Sciences et Technologies de la Mer (INSTM), 28, rue 2 mars 1934, Salammbô 2025, Tunisia
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