Habitat

Cyanobacteria can be found in terrestrial, marine, and freshwater habitats. They are primarily aquatic, meaning they are most commonly found living in water. However, along with frozen lakes, some other habitats of cyanobacteria include acidic bogs, the interior of solid limestone and dolomite rocks, loose sand grains, shell hash, and volcanoes. 

[frozen lake]

Andrew Brook. (10 Dec 2010). Coastguard Teams Battle the Cold Weather 
                                               Retrieved from:http://www.yachtingmonthly.com/news/509786/coastguard-teams-battle-the-cold-weather (04/17/2013)