Table 3.

Types of microbial communities found in Zavarzin

Type of community	Localization site, temperature	Composition of dominant microorganisms
Bottom scale brown organomineral formation	Crater of Zavarzin, depth of 30-50 cm. 56°C	Filamentous bacteria
Thin green flowing single-layer films	Develop along the edge of Zavarzin. About 40°C	Filamentous cyanobacteria
Loose thin dark green-gray epibioses	Develop along the stream branching off from Zavarzin, 20°C	Filamentous cyanobacteria and filamentous green algae
Green epibioses/films on cold soil	Ubiquitous. 10-15°C	Unicellular and colonial green algae