![]() ![]() ![]() Furthermore, global climate change is significantly accelerating the process of anthropogenic eutrophication due to the periodical increase of temperature registered every year 3, 4, 5. Anthropogenic sources, such as agriculture, urban, and industrial activities, are the most important pressures that add a significant load of nitrogen (N) and phosphorus (P) to the freshwater ecosystems and thus facilitating the appearance of CyanoHABs. Microcystis was a major factor significantly reducing PAB diversity and evenness, suggesting that it negatively influenced bacterioplankton assemblages, probably also altering the overall community functional potential.Ĭyanobacterial harmful algal blooms (CyanoHABs) are nowadays more frequently observed, with longer and more intense events being reported worldwide 1, 2. In post-summer, Sutterellaceae were recognized as poor water quality indicators, and their strong association with Microcystis could have represented an increased threat for that period. Both periods were associated to potential taxa with parasitic/predatory lifestyles against cyanobacteria. In mid-summer, PAB presented a mix-bloom dominated by Snowella, Aphanizomenon, and Microcystis, which were succeeded by toxigenic Microcystis in post-summer. PAB in pre-summer was diverse with Proteobacteria containing potential taxa involved in nitrogen-transforming processes. Network and ordination analyses indicated that PAB inter-relationships were more complex-numerous connections between taxa with stronger correlations, than FLB-rather influenced by physico-chemical parameters. ![]() 16S rRNA sequencing revealed that PAB were represented by Proteobacteria and Cyanobacteria, while FLB by Proteobacteria and Actinobacteria. Therefore, temporal changes of bacterioplankton communities and their functional potential through different developing stages of a Microcystis toxigenic bloom were investigated, considering bacterioplankton assemblages as particle-attached (PAB) and free-living (FLB) bacteria. However, the synergistic-antagonistic nature of the relationships between Microcystis and its microbiome still remains unclear. The cyanobacteria-associated microbiome is constantly reshaped by bloom development. ![]()
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