Key Species
Most of the landmass in the Antarctica is permanently covered with ice. However, life is still present in the 1% of the region that is ice- and snow-free. In these areas, there are large numbers of seals, penguins and birds, as well as a variety of mosses, liverworts, lichens and fungi.
British Antarctic Survey notes that there are:
- approx 100 species of mosses
- 25 species of liverworts
- 300 to 400 species of lichens.
They can tolerate low temperatures and dehydration, being specially adapted to surviving in extreme environments. Trees and shrubs do not grow in these conditions. There are only two species of flowering plants that occur in Antarctica, the Antarctic hair grass and Antarctic pearlwort. These arise along the warmer parts of the Antarctica Peninsula and in the South Orkney Islands and the South Shetland Islands. Human activities such as whale and seal hunts and the more recent waves of tourists have unintentionally carried non-native species into these regions. Invasive species are the biggest threat to the native flora of Antarctica.
The terrestrial fauna of the Antarctic continent is sparse; no higher insects are present, while micro-arthropods are restricted to limited areas of vegetation and (vertebrate) nutrient enrichment. In the most extreme continental cold deserts, simple food webs consist of as few as 1 – 3 nematode species, only one of which may be predatory. These cold desert soils are faunistically the least diverse habitats on Earth.