Institute of Biological Research (NIRDBS), 48 Republicii Street, 400015, Cluj-Napoca, Romania.
Biology Centre of the Czech Academy of Sciences, Institute of Hydrobiology, 37005, České Budějovice, Czech Republic.
Sci Rep. 2022 Sep 30;12(1):16409. doi: 10.1038/s41598-022-20580-2.
In freshwater systems, cyanobacteria are strong competitors under enhanced temperature and eutrophic conditions. Understanding their adaptive and evolutionary potential to multiple environmental states allows us to accurately predict their response to future conditions. To better understand if the combined impacts of temperature and nutrient limitation could suppress the cyanobacterial blooms, a single strain of Microcystis aeruginosa was inoculated into natural phytoplankton communities with different nutrient conditions: oligotrophic, eutrophic and eutrophic with the addition of bentophos. We found that the use of the bentophos treatment causes significant differences in prokaryotic and eukaryotic communities. This resulted in reduced biodiversity among the eukaryotes and a decline in cyanobacterial abundance suggesting phosphorus limitation had a strong impact on the community structure. The low temperature during the experiment lead to the disappearance of M. aeruginosa in all treatments and gave other phytoplankton groups a competitive advantage leading to the dominance of the eukaryotic families that have diverse morphologies and nutritional modes. These results show cyanobacteria have a reduced competitive advantage under certain temperature and nutrient limiting conditions and therefore, controlling phosphorus concentrations could be a possible mitigation strategy for managing harmful cyanobacterial blooms in a future warmer climate.
在淡水系统中，在温度升高和富营养化条件下，蓝藻是强有力的竞争者。了解它们对多种环境状态的适应和进化潜力，使我们能够准确预测它们对未来条件的反应。为了更好地了解温度和养分限制的综合影响是否会抑制蓝藻水华，我们将一株铜绿微囊藻接种到具有不同养分条件的天然浮游植物群落中：贫营养、富营养和富营养加添加了草甘膦。我们发现，使用草甘膦处理会导致原核生物和真核生物群落发生显著差异。这导致真核生物的生物多样性减少，蓝藻丰度下降，表明磷限制对群落结构有很强的影响。实验期间的低温导致所有处理中的铜绿微囊藻消失，而其他浮游植物群获得了竞争优势，导致具有不同形态和营养模式的真核生物家族占主导地位。这些结果表明，在某些温度和养分限制条件下，蓝藻的竞争优势会降低，因此，控制磷浓度可能是未来温暖气候下管理有害蓝藻水华的一种可行缓解策略。
