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.

沿海生态系统日益受到富营养化和营养不良的威胁。在这种情况下，由鞭毛鞭毛藻，氯鞭毛藻占主导的全部花开模式被配备了传感器的高频监测浮标进行了调查，该传感器可以进行营养和光合作用的测量。N / P比的增加会影响浮游植物的生理，导致水华塌陷并伴有轻微的氧气消耗。同时，对自然开花种群进行了富集实验。孵育5天后，使用流式细胞仪分析了群落结构，并分析了一些生理参数。数据表明，在充分富集的条件下，潜在的氮和磷共存限制以及初级生产和生产率之间的脱钩。在不平衡的氮磷输入下，观察到高水平的碱性磷酸酶活性和透明的外聚合颗粒产生，这有利于浮游植物的沉积。营养输入及其化学计量控制浮游植物的生长，