Mass developments of cyanobacteria, so-called blue-green algae blooms, repeatedly threaten the quality of water bodies and drinking water resources worldwide. Cyanobacteria are considered to be heat-loving, and massive algal blooms are reported mainly in summer, when monitoring is particularly close.
Click here for original story, Cyanobacterial blooms can also occur at colder temperatures, even under ice
Source: Phys.org