Zelnik Igor, Vodopivec Larisa, Germ Mateja
Department of Biology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, Slovenia.
Plants (Basel). 2025 May 30;14(11):1665. doi: 10.3390/plants14111665.
Different communities of primary producers were surveyed in a series of five river reservoirs on the Sava River in southeast Slovenia. Seasonal differences of phytoplanktonic and phytobenthic communities were studied in the reservoirs of hydroelectric power plants. Macrophytes were surveyed in the summer, while phytoplankton and periphyton were sampled in the winter and summer of 2021. The taxonomic composition of diatoms was studied in greater detail and additionally analysed. The results showed that the species composition of phytoplankton and phytobenthos differed between seasons. The communities were also more similar between the seasons at the same sampling site than between the sampling sites. Temperature was the parameter that had the greatest impact on the taxonomic composition of phytoplanktonic and phytobenthic communities. In total, 51 algal taxa and 81 species of diatoms were recorded, respectively. Furthermore, 15 species of aquatic macrophytes were found. The abundance of phytoplankton was the highest in the lowest reservoir in the series, in Brežice, where the temperature was also the highest. The number of macrophytes also increased downstream, but their abundances were low, mainly due to coarse substrate on the banks consisting of rocks and boulders. Constructing additional reservoirs on this section of the Sava River could increase the probability of the substantial growth of phytoplankton and cyanobacteria within it. On the other hand, providing patches of finer substrates (gravel, pebbles) would support the abundance of macrophyte species, which could control the concentrations of nutrients in the summer and prevent the blooms more efficiently.
在斯洛文尼亚东南部萨瓦河上的一系列五个河流水库中，对不同的初级生产者群落进行了调查。在水电站水库中研究了浮游植物和底栖植物群落的季节差异。在夏季对大型植物进行了调查，而在2021年冬季和夏季对浮游植物和周丛生物进行了采样。对硅藻的分类组成进行了更详细的研究并进行了额外分析。结果表明，浮游植物和底栖植物的物种组成在不同季节有所不同。在同一采样点的不同季节之间，群落也比不同采样点之间更为相似。温度是对浮游植物和底栖植物群落分类组成影响最大的参数。总共分别记录了51个藻类分类单元和81种硅藻。此外，还发现了15种水生大型植物。浮游植物的丰度在该系列最下游的布雷日采水库中最高，那里的温度也是最高的。大型植物的数量也向下游增加，但其丰度较低，主要是由于岸边由岩石和巨石组成的粗糙基质。在萨瓦河的这一段建造更多水库可能会增加其中浮游植物和蓝藻大量生长的可能性。另一方面，提供小块更细的基质（砾石、卵石）将有助于大型植物物种的丰度，这可以在夏季控制营养物质的浓度并更有效地防止水华。
