Abstract Planktothrix rubescens is a filamentous cyanobacterium with a worldwide distribution in lakes and reservoirs of varying size and morphology. The objective of this study was to identify the population dynamics and the major drivers of P. rubescens blooms. Samples for qualitative and quantitative analysis of phytoplankton were collected every month in 2014 and 2015 from stationary depths, while the main physical parameters were measured in situ along the water column. Samples for chemical analysis were collected below the surface, at mid-depth (metalimnion) and near the bottom. In the periods of thermal stratification, P. rubescens formed the maximum biomass in the metalimnion, however, its volume-weighted biomass reached the maximum value in the winter mixing period (4.40 mm3 l−1). Changes in the P. rubescens population in the reservoir were related to changes in the measured environmental parameters. Significant physical, hydrological, meteorological and chemical parameters were distinguished based on the multivariate analysis. The variable associated with water-level fluctuations showed the highest positive correlation with P. rubescens biomass. We conclude that it is necessary to establish water quality monitoring and prevent excessive water-level fluctuations to ensure a high quality of water supplies from the reservoir.

中文翻译：

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潜在有毒蓝细菌 P. rubescens 的繁殖：季节性分布及其在 Vrutci 水库（塞尔维亚）中增殖的可能驱动因素

摘要 Planktothrix rubescens 是一种丝状蓝藻，在世界范围内分布在大小和形态各异的湖泊和水库中。这项研究的目的是确定种群动态和 P. rubescens 开花的主要驱动因素。2014 年和 2015 年每月从静止深度采集浮游植物定性和定量分析样品，主要物理参数沿水柱原位测量。用于化学分析的样品在地表以下、中间深度（金属层）和底部附近收集。在热分层时期，P. rubescens 在金属膜中形成最大的生物量，而其体积加权生物量在冬季混合期达到最大值（4.40 mm3 l−1）。P 的变化。水库中的冬凌草种群与测量的环境参数的变化有关。基于多变量分析区分重要的物理、水文、气象和化学参数。与水位波动相关的变量显示与 P. rubescens 生物量的最高正相关。我们认为，有必要建立水质监测，防止水位过度波动，以确保水库的高质量供水。