What are the causes of a bloom?
Cyanobacteria or other algae bloom occurs usually because of high nutrient concentrations (e.g. eutrophication), warm weather, or both. Many other factors play a role in the formation of blue-green algae blooms including temperature, thermal stratification, zooplankton grazing, pH, turbidity and salinity. Most common blooms are caused by blue-green algae. Because these harmful algae dominate over other harmless algae due to their ability to regulate their buoyancy in response to environmental conditions and they can move where nutrient and light levels are at their highest.
