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Auteur Ben Othman, H.; Lanouguère, É.; Got, P.; Sakka Hlaili, A.; Leboulanger, C.
Titre Structural and functional responses of coastal marine phytoplankton communities to PAH mixtures Type Article scientifique
Année 2018 Publication Revue Abrégée Chemosphere
Volume 209 Numéro Pages 908-919
Mots-Clés Ecotoxicity; Mediterranean coastal lagoons; PAH mixtures (PAHs); Phytoplankton communities
Résumé The toxicity of polycyclic aromatic hydrocarbons (PAHs) mixtures was evaluated on natural phytoplankton communities sampled from lagoons of Bizerte (South-western Mediterranean Sea) and Thau (North-western Mediterranean Sea). PAHs induced short-term dose and ecosystem-dependant decreases in photosynthetic potential. Chlorophyll a was negatively affected by increasing PAHs concentrations, together with dramatic changes in phytoplankton community composition. Size classes were strongly affected in the Bizerte compare to the Thau lagoon, with a decrease in nano- and microphytoplankton densities compare to picophytoplankton. In both locations, the diatom Entomoneis paludosa appeared favoured under PAH exposure as evidenced by increase in cell density, whereas autotrophic flagellates and dinophytes were strongly reduced. Smaller cells were more tolerant to exposure to highest PAHs concentrations, with persistent picophytoplankton carbon biomass at the end of the incubations. Apparent recovery of photosynthetic potential, accompanied with a regrowth of chlorophyll a under the lowest PAH doses, coincided with a significantly altered community composition in both lagoons. Furthermore, sensitivity to PAHs was not related to the phytoplankton cell size, and toxicity-induced modification of top-down control by grazers during the experiment cannot be excluded.
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Volume de collection Numéro de collection Edition
ISSN 0045-6535 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2403
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Auteur Cecchi, P.; Garrido, M.; Collos, Y.; Pasqualini, V.
Titre Water flux management and phytoplankton communities in a Mediterranean coastal lagoon. Part II: Mixotrophy of dinoflagellates as an adaptive strategy? Type Article scientifique
Année 2016 Publication Revue Abrégée Marine Pollution Bulletin
Volume 108 Numéro 1–2 Pages 120-133
Mots-Clés Biguglia; Mediterranean coastal lagoon; Mixotrophy; Phyto-PAM; Phytoplankton; Prorocentrum minimum
Résumé Dinoflagellate proliferation is common in coastal waters, and trophic strategies are often advanced to explain the success of these organisms. The Biguglia lagoon is a Mediterranean brackish ecosystem where eutrophication has long been an issue, and where dominance of dinoflagellates has persisted for several years. Monthly monitoring of fluorescence-based properties of phytoplankton communities carried out in 2010 suggested that photosynthesis alone could not support the observed situation all year round. Contrasting food webs developed depending on the hydrological season, with a gradual shift from autotrophy to heterotrophy. Progressively, microphytoplankton assemblages became unequivocally dominated by a Prorocentrum minimum bloom, which exhibited very weak effective photosynthetic performance, whereas paradoxically its theoretical capacities remained fully operational. Different environmental hypotheses explaining this discrepancy were examined, but rejected. We conclude that P. minimum bloom persistence is sustained by mixotrophic strategies, with complex compromises between phototrophy and phagotrophy, as evidenced by fluorescence-based observations.
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Langue Langue du Résumé Titre Original
Éditeur de collection Titre de collection Titre de collection Abrégé
Volume de collection Numéro de collection Edition
ISSN 0025-326x ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 1579
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Auteur Derolez, V.; Soudant, D.; Malet, N.; Chiantella, C.; Richard, M.; Abadie, E.; Aliaume, C.; Bec, B.
Titre Two decades of oligotrophication: Evidence for a phytoplankton community shift in the coastal lagoon of Thau (Mediterranean Sea, France) Type Article scientifique
Année 2020 Publication Revue Abrégée Estuarine, Coastal and Shelf Science
Volume Numéro Pages 106810
Mots-Clés Eutrophication; Mediterranean coastal lagoon; Nutrients; Oligotrophication; Phytoplankton community shift; Recovery
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ISSN 0272-7714 ISBN Médium
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Notes WOS:000539292700003 Approuvé pas de
Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2776
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Auteur Fiandrino, A.; Ouisse, V.; Dumas, F.; Lagarde, F.; Pete, R.; Malet, N.; Le Noc, S.; de Wit, R.
Titre Spatial patterns in coastal lagoons related to the hydrodynamics of seawater intrusion Type Article scientifique
Année 2017 Publication Revue Abrégée Mar. Pollut. Bull.
Volume 119 Numéro 1 Pages 132-144
Mots-Clés bay; confinement; estuary; Hydromorphological zonations; Mediterranean coastal lagoons; Mixing efficiency; model performance; Numerical model; sparus-aurata; Transport timescale; transport time scales; ulva rigida; venice lagoon; Water renewal; water renewal timescales; wind-driven circulation
Résumé Marine intrusion was simulated in a choked and in a restricted coastal lagoon by using a 3D-hydrodynamic model. To study the spatiotemporal progression of seawater intrusion and its mixing efficiency with lagoon waters we define Marine Mixed Volume (V-MM) as a new hydrodynamic indicator. Spatial patterns in both lagoons were described by studying the time series and maps of VMM taking into account the meteorological conditions encountered during a water year. The patterns comprised well-mixed zones (WMZ) and physical barrier zones (PBZ) that act as hydrodynamic boundaries. The choked Bages-Sigean lagoon comprises four sub-basins: a PBZ at the inlet, and two WMZ's separated by another PBZ corresponding to a constriction zone. The volumes of the PBZ were 2.1 and 5.4 millions m(3) with characteristic mixing timescale of 68 and 84 days, respectively. The WMZ were 123 and 433 millions m(3) with characteristics mixing timescale of 70 and 39 days, respectively. (C) 2017 Elsevier Ltd. All rights reserved.
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Langue English Langue du Résumé Titre Original
Éditeur de collection Titre de collection Titre de collection Abrégé
Volume de collection Numéro de collection Edition
ISSN 0025-326x ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 2181
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Auteur Garrido, M.; Cecchi, P.; Collos, Y.; Agostini, S.; Pasqualini, V.
Titre Water flux management and phytoplankton communities in a Mediterranean coastal lagoon. Part I: How to promote dinoflagellate dominance? Type Article scientifique
Année 2016 Publication Revue Abrégée Marine Pollution Bulletin
Volume 104 Numéro 1–2 Pages 139-152
Mots-Clés Biguglia, Eutrophication; Mediterranean coastal lagoon; Phytoplankton; Prorocentrum minimum; Water management
Résumé The Biguglia lagoon is a shallow Mediterranean coastal ecosystem where eutrophication is increasing for years. A channel supplying freshwater was cleared in 2009 to enhance lagoon water circulation and alleviate dystrophic crises. Monthly monitoring was started in 2010 to document the impacts of this action on abiotic characteristics and phytoplankton communities. Three stations were surveyed (by microscopy and HPLC). Evidence suggests that this operation had an unexpected outcome. Salinity footprints indicated the succession of three main hydrological sequences that depended on rainfall and circulation pattern. Diatoms and dinoflagellates dominated the first sequence, characterized by heavy rainfall, while Prorocentrum minimum became progressively the dominant species in the second period (increasing salinities) with extensive bloom over the whole lagoon (5.93 × 10-5 cells·L− 1) during the third period. These phytoplankton successions and community structures underline the risk of pernicious effects arising from remediation efforts, in the present case based on increasing freshwater inputs.
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Editeur Lieu de Publication Éditeur
Langue Langue du Résumé Titre Original
Éditeur de collection Titre de collection Titre de collection Abrégé
Volume de collection Numéro de collection Edition
ISSN 0025-326x ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 1525
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