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

TitreCoupling high frequency monitoring and bioassay experiments to investigate a harmful algal bloom in the Bay of Seine (French-English Channel)
Type de publicationJournal Article
Year of Publication2021
AuteursSerre-Fredj, L, Jacqueline, F, Navon, M, Izabel, G, Chasselin, L, Jolly, O, Répécaud, M, Claquin, P
JournalMarine Pollution Bulletin
Volume168
Pagination112387
Date PublishedJan-07-2021
ISSN0025326X
Résumé

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.

URLhttps://linkinghub.elsevier.com/retrieve/pii/S0025326X21004215
DOI10.1016/j.marpolbul.2021.112387
Short TitleMarine Pollution Bulletin
Catégorie HCERES
ACL - Articles dans des revues à comité de lecture
Publication coopération et recherche SUD
Non