Phytoplankton community structure was studied from 2002 to 2016 in the Vistula Lagoon (southern Baltic Sea) in the context of the 2010 shift in its population, as well as the reason for this shift and its environmental impact. This evident shift was indicated by Multidimensional Scaling at the Bray Curtis similarity level of 31%. Before 2010, the primary components of phytoplankton were Cyanobacteria (up to 98% of the biomass, October 2007) and Chlorophyta (40%, July 2002). After 2010, the contribution of Cyanobacteria considerably decreased, and the proportions of other phyla increased. The total phytoplankton biomass positively correlated with phosphorus, and Cyanobacteria biomass with silica. Evident changes were also observed in the seasonal dynamics of phytoplankton. Before 2010, the highest values of biomass occurred in autumn, and were related to high biomass of Cyanobacteria. Higher biomass has been recently reached in spring, during the dominance of Ochrophyta associated with Chlorophyta, Charophyta, and Cryptophyta. Generalised additive models showed a significant decreasing trend of the total phytoplankton biomass, Cyanobacteria, Chlorophyta, and flagellates, suggesting a decrease in eutrophication. This trend is concurrent with a considerable increase in the ratio of zooplankton to phytoplankton biomass since 2010. The increased ratio, however, did not result from elevated zooplankton biomass, but from the drop in phytoplankton biomass. Therefore, the most probable reason for the decrease in phytoplankton biomass was the simultaneous decrease in the concentration of all nutrients. The potential additional impact of filtration by a new alien bivalve Rangia cuneata G. B. Sowerby I, 1832 is also discussed.

根据2010年人口迁移及其变化的原因及其对环境的影响，对2002年至2016年在维斯杜拉泻湖（波罗的海南部）进行的浮游植物群落结构进行了研究。多维比例缩放在Bray Curtis相似度为31％时表明了这种明显的变化。在2010年之前，浮游植物的主要成分是蓝细菌（占生物量的98％，2007年10月）和绿藻（40％，2002年7月）。2010年之后，蓝细菌的贡献显着下降，其他门的比例增加。浮游植物的总生物量与磷呈正相关，蓝藻的生物量与二氧化硅呈正相关。在浮游植物的季节动态中也观察到明显的变化。在2010年之前，生物量的最高值发生在秋天，并与蓝细菌的高生物量有关。在春季，在与绿藻类，绿藻类和隐藻类相关的O体占主导地位的过程中，已经达到了更高的生物量。广义加性模型显示了浮游植物总生物量，蓝细菌，绿藻和鞭毛的显着下降趋势，表明富营养化程度降低。自2010年以来，这种趋势与浮游动物与浮游植物生物量的比例显着增加同时出现。然而，增加的比例并不是浮游动物生物量的增加，而是浮游植物生物量的下降。因此，浮游植物生物量减少的最可能原因是所有营养素浓度的同时降低。一个新的外星双壳类动物可能对过滤产生额外的影响还讨论了Rangia cuneata GB Sowerby I，1832年。