|Extremophiles can be classified according
to the conditions in which they exist:
Microorganisms having a growth temperature optimum of 50°C
or higher. They are found in hot springs and other hot environments.
Microorganisms having a growth temperature optimum of 80 °C
and above. They live in deep-sea vents and hot springs.
Microorganisms that live in salty environments. According
to their salt requirements, moderate Halophiles grow between
2% and 5% salt concentrations (0.2-0.85 M) and extreme Halophiles
grow optimally at salt concentrations above 20% (3.4-5.1M).
They live in places like salt lakes and salt mines.
Microorganisms with a growth optimum at or below pH 2. They
live in places like sulphur springs or acidic mine waters.
Microorganisms with optimal growth at pH above 10. They are
found in places like soda lakes.
Microorganisms having an optimum growth temperature of 15°C
or lower, some can survive at -10°C and are unable to
grow above 20°C. They are found in sea ice as much as
in Arctic and Antarctic ice packs.
Microorganisms that live optimally at high hydrostatic pressures
(up to 130 MPa). They are found in deep-sea hydrothermal vents.
(Previously termed barophiles)
Microorganisms resisting extremely dry environments, like
for example the Chilean Atacama desert.