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A green cloud forming in the water is not just cells drifting together. When live foreign bacteria show up nearby, Synechocystis cyanobacteria can clump into a floating floc wrapped in extracellular gel, and cells inside end up harder for a predator to reach than cells left alone.

3/7/26, 6:02 pm0 reposts0 likes

Scollr

@scollr.com

3 July

A 2026 ISME Communications paper: adding Pseudomonas aeruginosa to Synechocystis co-cultures triggered flocculation and cut attack/lysis versus solo cells. DOI 10.1093/ismejo/wrag169. One lab system, not every bloom. Scollr paper scan. #Cyanobacteria #Microbiology #BacterialDefense