Types of Extremophiles
Extremophile↕ | Condition↕ | Tolerance Limit↕ | Example Organism↕ | Habitat↕ | Known For↕ |
|---|---|---|---|---|---|
Thermophile | Heat | 45-80 C | Thermus aquaticus | Yellowstone hot springs | Source of Taq polymerase, the enzyme that powers every PCR test on Earth |
Hyperthermophile | Extreme heat | 80-122 C | Methanopyrus kandleri | Hydrothermal vents | Current record-holder for growth at 122 C, higher than household pressure cookers |
Psychrophile | Cold | -20 to 15 C | Colwellia psychrerythraea | Arctic sea ice, deep sea | Grow in ice and subfreezing brines, antifreeze proteins prevent cell damage |
Acidophile | Low pH | pH <3 | Picrophilus torridus | Volcanic hot springs, acid mine drainage | Grows at pH 0, more acidic than battery acid, thrives in Rio Tinto |
Alkaliphile | High pH | pH >9 | Bacillus alkalophilus | Soda lakes | Used to produce laundry detergent enzymes that work in alkaline wash water |
Halophile | Salt | Up to saturation (~35% NaCl) | Halobacterium salinarum | Dead Sea, Great Salt Lake, salt flats | Turn salt ponds pink, use retinal pigment to capture light like a simple version of vision |
Barophile / Piezophile | High pressure | Up to ~110 MPa | Moritella yayanosii | Mariana Trench | Thrives at deepest ocean pressures, would explode at sea level |
Xerophile | Dryness | aw <0.75 | Xeromyces bispora | Dried fruit, desert soils | Can grow on nearly dry substrates, spoils dried prunes and raisins |
Radioresistant | Radiation | 5000+ Gy | Deinococcus radiodurans | Worldwide | Nicknamed Conan the Bacterium, survives 1000x the radiation dose lethal to humans |
Oligotroph | Low nutrients | Starvation levels | Pelagibacter ubique | Open ocean | Smallest free-living cell, most abundant organism on Earth by number |
Toxitolerant | High heavy metals | Lethal concentrations to most life | Ferroplasma acidarmanus | Iron Mountain, California | Lives in sulfuric acid laced with arsenic and copper |
Endolith | Inside rocks | Deep subsurface | Candidatus Desulforudis audaxviator | Gold mines 2.8 km deep | Only known ecosystem run by a single species, fuel from radioactive decay |
Metallotolerant | High metal concentration | Lethal metal concentrations | Cupriavidus metallidurans | Metal-rich soils, ISS surfaces | Precipitates gold nanoparticles out of toxic solutions |
Polyextremophile | Multiple extremes | Heat + acid + salt + radiation | Tardigrades (water bears) | Moss, lichen, abyssal mud | Survive boiling, freezing, vacuum of space, and radiation doses thousands of times human lethal |
Anaerobic / Methanogen | Zero oxygen | Obligate anaerobe | Methanococcus jannaschii | Hydrothermal vents | First archaeon to have its genome sequenced, produces methane from hydrogen and CO2 |
Cryophile (deep ice) | Sub-glacial cold + pressure | Below -10 C at depth | Planococcus halocryophilus | Arctic permafrost | Still metabolizing at -15 C, one of coldest known replicating organisms |
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