Homogenization of reservoir eukaryotic algal and cyanobacterial communities is accelerated by dam construction and eutrophication

•Temporal turnover of algal communities has been revealed by sequencing DNA.•Dam construction and eutrophication have accelerated the homogenization of algal communities.•Key tolerant taxa were identified using machine learning and network analysis.•Relationships of ecosystem resilience with the algal homogenization were evaluated.•Anthropogenic nutrient loading favors the growth of harmful algal taxa.