Coupling high frequency monitoring and bioassay experiments to investigate a harmful algal bloom in the Bay of Seine (French-English Channel)

Type Article
Date 2021-07
Language English
Author(s) Serre-Fredj Léon1, 2, Jacqueline Franck3, Navon Maxime1, 2, Izabel Guillaume1, 4, Chasselin Leo1, 4, Jolly Orianne1, 4, Repecaud MichelORCID5, Claquin Pascal1, 2
Affiliation(s) 1 : Normandie Université, Université de Caen Normandie, Esplanade de la Paix, F-14032, Caen, France
2 : Laboratoire Biologie des ORganismes et Ecosystèmes Aquatiques (BOREA, UMR 8067), Sorbonne Université, Muséum National d'Histoire Naturelle, CNRS, Université Pierre et Marie Curie, Université de Caen Normandie, IRD 207, Université des Antilles. Centre de Recherches en Environnement Côtier (CREC), Station Marine, BP49, 54, rue du Docteur Charcot, 14530 Luc-sur-Mer, France
3 : Ifremer LER/N, Avenue du Général de Gaulle, 14520 Port-en-Bessin, France
4 : Centre de Recherches en Environnement Côtier (CREC) - Station Marine de l'Université de Caen Normandie, BP49, 54, rue du Docteur Charcot, 14530, France
5 : Ifremer Centre de Brest REM/RDT/DCM, ZI de la pointe du Diable CS 10070, 29280 Plouzané, France
Source Marine Pollution Bulletin (0025-326X) (Elsevier BV), 2021-07 , Vol. 168 , P. 112387 (12p.)
DOI 10.1016/j.marpolbul.2021.112387
WOS© Times Cited 8
Keyword(s) Lepidodinium chlorophorum, Eutrophication, FRRf, Transparent exopolymeric particles, Flow cytometry

Coastal ecosystems are increasingly threatened by eutrophication and dystrophy. In this context, the full pattern of a bloom dominated by the dinoflagellate, Lepidodinium chlorophorum, was investigated by a high frequency monitoring buoy equipped with sensors allowing nutrients and photosynthesis measurements. An increase of the N/P ratio affected phytoplankton physiology leading to bloom collapse with a slight oxygen depletion. In parallel, enrichment experiments were performed on the natural bloom population. After 5 days of incubation the community structure, using flow cytometry and several physiological parameters were analysed. The data reveal a potential N and P co-limitation and a decoupling between primary production and productivity in fully enriched conditions. Under unbalanced N/P inputs, high level of alkaline phosphatase activity and transparent exopolymeric particle production, which favour phytoplankton sedimentation, were observed. Nutrient inputs and their stoichiometry control phytoplankton growth, the community structure, physiological regulations, the fate of the bloom and consequences.

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Serre-Fredj Léon, Jacqueline Franck, Navon Maxime, Izabel Guillaume, Chasselin Leo, Jolly Orianne, Repecaud Michel, Claquin Pascal (2021). Coupling high frequency monitoring and bioassay experiments to investigate a harmful algal bloom in the Bay of Seine (French-English Channel). Marine Pollution Bulletin, 168, 112387 (12p.). Publisher's official version : , Open Access version :