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While altered precipitation regimes are recognized as critical climate multipliers, their hierarchical controls on cyanobacterial harmful algal bloom dynamics remain poorly quantified, particularly in stratified reservoirs. Here, we integrate a 60\u2010yr (1961\u20132020) trend analysis of rainfall extremes with 4\u2009yr (2017\u20132020) of high\u2010frequency monitoring of hydrology, nutrients, and phytoplankton through manual sampling and autonomous buoys in Lake Qiandaohu, a deep subtropical reservoir vital for drinking water in eastern China. Using Mann\u2013Kendall trend analysis, random forest, and partial least squares path modeling, we elucidate the hierarchical mechanisms linking altered rainfall regimes to phytoplankton community shifts, with a focus on cyanobacterial harmful algal blooms. Our results reveal significant increases in both annual rainfall and rainstorm frequency over the past six decades, with peak events coinciding notably with early summer agricultural fertilization. Intensified early summer rainstorms triggered disproportionate phosphorus loading, significantly lowering N\/P ratios and transiently suppressing cyanobacterial dominance. However, a critical approximately 20\u2010d lag period followed these events, wherein rapid thermal stratification recovery, combined with persistent legacy nutrients, selectively favored cyanobacterial proliferation. Furthermore, subsequent continuous dry\u2010hot spells amplified cyanobacterial dominance by enhancing water column stability and elevating temperatures. These findings reveal a paradoxical post\u2010storm vulnerability window that facilitates bloom formation in climate\u2010sensitive reservoirs. Given projected intensification of rainfall extremes under climate change, this study highlights the urgent need for integrated management strategies combining watershed nutrient control, meteorological forecasting, and adaptive reservoir operation to mitigate cyanobacterial harmful algal bloom risks.<\/jats:p>","DOI":"10.1002\/lno.70222","type":"journal-article","created":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T11:29:27Z","timestamp":1760009367000},"page":"3462-3476","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Rainstorm regimes modulate cyanobacterial bloom dynamics in deep reservoirs: Synergistic effects of nutrient pulses and hydrological perturbations"],"prefix":"10.1002","volume":"70","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-5633-6828","authenticated-orcid":false,"given":"Yu","family":"Qiu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Lake and Watershed Science for Water Security Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences  Nanjing People's Republic of China"},{"name":"University of Chinese Academy of Sciences  Beijing People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0297-5368","authenticated-orcid":false,"given":"Hai","family":"Xu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Lake and Watershed Science for Water Security Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences  Nanjing People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9697-5168","authenticated-orcid":false,"given":"Wei","family":"Zou","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Lake and Watershed Science for Water Security Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences  Nanjing People's Republic of 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xingchen","family":"Zhao","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Lake and Watershed Science for Water Security Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences  Nanjing People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mengyuan","family":"Zhu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Lake and Watershed Science for Water Security Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences  Nanjing People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Boqiang","family":"Qin","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Lake and Watershed Science for Water Security Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences  Nanjing People's Republic of 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