By Max Roman Dilthey
Updated Aug 30, 2022
coolkengzz/iStock/Getty Images
Antarctica and the Arctic Circle present a harsh environment of intense cold, high winds, and extremely low moisture. Despite temperatures plunging to –125.8°F, plant life persists in a surprisingly resilient way. With most of Antarctica blanketed by snow and ice, only about 1 % of the continent’s land area supports plant colonization. The few species that thrive there have evolved remarkable adaptations to survive the extreme climate.
Vascular plants—ferns, trees, and flowering species—were largely wiped out from Antarctica when glaciation began 50 million years ago. They remain common in sub‑antarctic islands, but are virtually absent on the mainland. Instead, the continent’s photosynthetic community is dominated by bryophytes—mosses, liverworts, and lichens—as well as algae and cyanobacteria.
Of the 800 plant species that appear in the Antarctic tundra, lichens account for 350. Although lichens are technically a symbiosis between fungi and algae or cyanobacteria, they function as the dominant “plants” of the region. Their ability to shut down metabolism during extreme cold allows them to survive long winters, quickly resuming photosynthesis when short summer windows open. Some lichens grow less than a millimetre a year and are among the oldest living organisms on Earth.
With more than 130 distinct species, mosses and liverworts—collectively known as bryophytes—form the backbone of Antarctica’s terrestrial flora. Mosses thrive wherever lichens can, often filling moist habitats such as meltwater channels or glacial outflows. Liverworts, however, are restricted to coastal zones.
Polar bryophytes employ several strategies to cope with the extreme environment. Many reproduce asexually when cold hampers sexual reproduction, and they feature tightly packed stems and roots that conserve water—critical in a landscape where unfrozen moisture is scarce. Most grow beneath a protective snow cover, which shields them from wind‑blown ice and the coldest temperatures. Without this insulation, they face photoinhibition—a light‑induced reduction in photosynthesis that slows growth.
These hardy species demonstrate that life can flourish even in the planet’s most unforgiving habitats, turning the frozen world into a surprisingly vibrant ecosystem.
