Interannual shifts in July cyanobacterial communities toward bloom-forming taxa amid nutrient decline and warming in Lake Changhu.

Cyanobacterial dominance in Lake Changhu increased from 2.2% to 98.3% between 2012 and 2025 despite declining nutrients and warming.

• Why it matters: Understanding how cyanobacterial communities respond to simultaneous nutrient reduction and climate warming is crucial for managing harmful algal blooms in eutrophic lakes.
• What they did: Long-term July phytoplankton data from 2012 to 2025 were analyzed, focusing on community composition, functional groups, and environmental variables, revealing a shift toward bloom-forming taxa.
• The result: The findings show a significant rise in bloom-forming cyanobacteria, linked to temperature and phosphorus interactions, highlighting the need for integrated monitoring to predict bloom risks.