FN Archimer Export Format PT J TI Coupling high frequency monitoring and bioassay experiments to investigate a harmful algal bloom in the Bay of Seine (French-English Channel) BT AF Serre-Fredj, Léon Jacqueline, Franck Navon, Maxime Izabel, Guillaume Chasselin, Leo Jolly, Orianne Repecaud, Michel Claquin, Pascal AS 1:1,2;2:3;3:1,2;4:1,4;5:1,4;6:1,4;7:5;8:1,2; FF 1:;2:PDG-ODE-LITTORAL-LERN;3:;4:;5:;6:;7:PDG-REM-RDT-LDCM;8:; C1 Normandie Université, Université de Caen Normandie, Esplanade de la Paix, F-14032, Caen, France 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 Ifremer LER/N, Avenue du Général de Gaulle, 14520 Port-en-Bessin, France Centre de Recherches en Environnement Côtier (CREC) - Station Marine de l'Université de Caen Normandie, BP49, 54, rue du Docteur Charcot, 14530, France Ifremer Centre de Brest REM/RDT/DCM, ZI de la pointe du Diable CS 10070, 29280 Plouzané, France C2 UNIV NORMANDIE, FRANCE MNHN, FRANCE IFREMER, FRANCE UNIV CAEN, FRANCE IFREMER, FRANCE SI PORT-EN-BESSIN BREST SE PDG-ODE-LITTORAL-LERN PDG-REM-RDT-LDCM IN WOS Ifremer UPR copubli-france copubli-univ-france IF 7.001 TC 8 UR https://archimer.ifremer.fr/doc/00690/80239/102688.pdf LA English DT Article DE ;Lepidodinium chlorophorum;Eutrophication;FRRf;Transparent exopolymeric particles;Flow cytometry AB 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. PY 2021 PD JUN SO Marine Pollution Bulletin SN 0025-326X PU Elsevier BV VL 168 UT 000661829000004 DI 10.1016/j.marpolbul.2021.112387 ID 80239 ER EF