The Antarctic continent has never had a native or permanent population of humans. In 1998 the United States, Russia, Belgium, Australia, and several other countries signed one of an ongoing series of treaties to preserve Antarctica. The continent is used for peaceful international endeavors such as scientific research and ecotourism.
Terrestrial Flora
There are only two types of flowering plants in Antarctica, a grass and a small pearlwort (Deschampsia Antarctica). These are restricted to the more temperate Antarctic Peninsula. Antarctic hairgrass (Colobanthus quitensis) forms dense mats and grows fairly rapidly in the austral summer (December, January, and February). At the end of summer, the hair grass’s nutrients move underground, and the leaves die. Pearlwort forms cushion-shaped clusters and grows only 0.08 to 0.25 inch (2 to 6 millimeters) per year.
Numerous species of primitive plants, such as lichens, mosses, fungi, algae, and diatoms, live in Antarctica. Lichens are made up of an alga and a fungus in a symbiotic (interdependent) relationship. They can use water in the form of vapor, liquid, snow, or ice. Lichens grow as little as 0.04 inch (1 millimeter) every one hundred years, and some patches may be more than five thousand years old. Mosses are not as hardy as lichens and also grow slowly, a boot print in a moss carpet may be visible for years. Fungi are found in the more temperate peninsula, and most are microscopic.
Algae grow in Antarctic lakes, runoff near bird colonies, moist soil, and snow fields. During the summer, algae form spectacular red, yellow, or green patches on the snow. Bacteria are found in lakes, melt water, and soils. As elsewhere on the earth, bacteria play a role in decomposition. Because of the extreme conditions, they are not always as efficient in Antarctica as they are in warmer climates, and carcasses may lie preserved for hundreds of years.
See also: Asian flora, North american flora, South american flora, European flora
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