| Deschampsia antarctica | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Monocots |
| Clade: | Commelinids |
| Order: | Poales |
| Family: | Poaceae |
| Subfamily: | Pooideae |
| Genus: | Deschampsia |
| Species: | D. antarctica |
| Binomial name | |
| Deschampsia antarctica | |
| Synonyms [1] | |
Deschampsia antarctica, the Antarctic hair grass, is one of two flowering plants native to Antarctica, the other being Colobanthus quitensis (Antarctic pearlwort).
Deschampsia antarctica mainly occurs on the South Orkney Islands, the South Shetland Islands, and along the western Antarctic Peninsula. [2] Deschampsia antartica distribution largely depends on the area's nutrient supply of the soil and its water distribution. [3] Deschampsia antarctica has been recorded by the Guinness Book of World Records as the southernmost flowering plant. In 1981, a specimen was found on the Antarctic Peninsula's Refuge Islands at a latitude of 68°21′S. [4] [5] Since 2009, both D.antarctica and C. quitensis have been spreading rapidly, which studies suggest has been the result of rising air temperatures and a reduction in the number of fur seals. [6]
In Antarctica, the plant can be found forming low clumps in wet, protected habitats. [2]
The Antarctic is a polar region around Earth's South Pole, opposite the Arctic region around the North Pole.
In physical geography, tundra is a type of biome where tree growth is hindered by frigid temperatures and short growing seasons. The term tundra comes through Russian тундра from the Kildin Sámi word тӯндар meaning "uplands", "treeless mountain tract". There are three regions and associated types of tundra: Arctic tundra, alpine tundra, and Antarctic tundra.
The British Antarctic Territory (BAT) is a sector of Antarctica claimed by the United Kingdom as one of its 14 British Overseas Territories, of which it is by far the largest by area. It comprises the region south of 60°S latitude and between longitudes 20°W and 80°W, forming a wedge shape that extends to the South Pole, overlapped by the Antarctic claims of Argentina and Chile. The claim to the region has been suspended since the Antarctic Treaty came into force in 1961.
Caryophyllaceae, commonly called the pink family or carnation family, is a family of flowering plants. It is included in the dicotyledon order Caryophyllales in the APG III system, alongside 33 other families, including Amaranthaceae, Cactaceae, and Polygonaceae. It is a large family, with 81 genera and about 2,625 known species.
Antarctic flora are a distinct community of vascular plants which evolved millions of years ago on the supercontinent of Gondwana. Presently, species of Antarctica flora reside on several now separated areas of the Southern Hemisphere, including southern South America, southernmost Africa, New Zealand, Australia, and New Caledonia. Joseph Dalton Hooker was the first to notice similarities in the flora and speculated that Antarctica had served as either a source or a transitional point, and that land masses now separated might formerly have been adjacent.
The Antarctic Peninsula, known as O'Higgins Land in Chile and Tierra de San Martín in Argentina, and originally as Graham Land in the United Kingdom and the Palmer Peninsula in the United States, is the northernmost part of mainland Antarctica.
The Antarctic realm is one of eight terrestrial biogeographic realms. The ecosystem includes Antarctica and several island groups in the southern Atlantic and Indian oceans. The continent of Antarctica is so cold that it has supported only 2 vascular plants for millions of years, and its flora presently consists of around 250 lichens, 100 mosses, 25-30 liverworts, and around 700 terrestrial and aquatic algal species, which live on the areas of exposed rock and soil around the shore of the continent. Antarctica's two flowering plant species, the Antarctic hair grass and Antarctic pearlwort, are found on the northern and western parts of the Antarctic Peninsula. Antarctica is also home to a diversity of animal life, including penguins, seals, and whales.
The South Polar region of the Cretaceous comprised the continent of East Gondwana–modern day Australia, Zealandia, and Antarctica–a product of the break-up of Gondwana in the Cretaceous Period. The southern region, during this time, was much warmer than it is today, ranging from perhaps 4–8 °C (39–46 °F) in the latest Cretaceous Maastrichtian in what is now southeastern Australia. This prevented permanent ice sheets from developing and fostered polar forests, which were largely dominated by conifers, cycads, and ferns, and relied on a temperate climate and heavy rainfall. Major fossil-bearing geological formations that record this area are: the Santa Marta and Sobral Formations of Seymour Island off the Antarctic Peninsula; the Snow Hill Island, Lopez de Bertodano, and the Hidden Lake Formations on James Ross Island also off the Antarctic Peninsula; and the Eumeralla and Wonthaggi Formations in Australia.
Colonization of Antarctica refers to establishment of civilian settlements in Antarctica having humans, including families, living on the continent of Antarctica. Currently, the continent hosts only two civilian colonies, the Argentinian-administered Esperanza Base and Chilean-administered Villa Las Estrellas, as well as about 70 scientific and military bases with a transient population of scientists and support staff. Antarctica is the only continent on Earth without indigenous human inhabitants, despite its proximity to Argentina and Chile at the Antarctic Peninsula.
Colobanthus quitensis, the Antarctic pearlwort, is one of two native flowering plants found in the Antarctic region. It has yellow flowers and grows about 5 cm tall, with a cushion-like growth habit that gives it a moss-like appearance.
Deschampsia is a genus of plants in the grass family, commonly known as hair grass or tussock grass. The genus is widespread across many countries.
Yankee Harbour is a small inner harbour entered from Shopski Cove between Glacier Bluff and Spit Point, indenting the south-west side of Greenwich Island in the South Shetland Islands, Antarctica. It is 2.35 km (1.46 mi) long in west-south-west to east-north-east direction, and 1.6 km (0.99 mi) wide, and is bounded by Provadiya Hook to the south-west, Parvomay Neck to the north and east, and Kladara Beach to the south.
Antarctica is Earth's southernmost and least-populated continent. Situated almost entirely south of the Antarctic Circle and surrounded by the Southern Ocean, it contains the geographic South Pole. Antarctica is the fifth-largest continent, being about 40% larger than Europe, and has an area of 14,200,000 km2 (5,500,000 sq mi). Most of Antarctica is covered by the Antarctic ice sheet, with an average thickness of 1.9 km (1.2 mi).
The Joubin Islands are a group of small islands lying 6 kilometres (3 nmi) south-west of Cape Monaco, Anvers Island, at the south-western end of the Palmer Archipelago of Antarctica. The islands were discovered by the French Antarctic Expedition, 1903–05, under Jean-Baptiste Charcot, and named by him for Louis Joubin, the French naturalist. They have been designated a Restricted Zone under ASMA 7 — Southwest Anvers Island and Palmer Basin — which includes the marine area extending 50 metres (55 yd) from the shorelines.
Harmony Point is a point which lies close west of Harmony Cove and forms both the south side of the entrance to Malak Sechko Cove and the western extremity of Guangzhou Peninsula and Nelson Island, in the South Shetland Islands of Antarctica. It was charted in 1935 by Discovery Investigations personnel on the Discovery II, and named from association with Harmony Cove.
Lagotellerie Island is an island 1.9 kilometres (1 nmi) long, lying 3.7 kilometres (2 nmi) west of Horseshoe Island in Marguerite Bay, off the west coast of Graham Land, Antarctica. It was discovered and named by the French Antarctic Expedition, 1908–10, under Jean-Baptiste Charcot.
The Cierva Point and offshore islands Important Bird Area is a 6540 ha tract of land and sea on the Danco Coast of the Antarctic Peninsula.
The La Meseta Formation is a sedimentary sequence deposited during the Eocene on Seymour Island off the coast of the Antarctic Peninsula. It is noted for its fossils, which include both marine organisms and the only terrestrial vertebrate fossils from the Cenozoic of Antarctica.
The wildlife of Antarctica are extremophiles, having adapted to the dryness, low temperatures, and high exposure common in Antarctica. The extreme weather of the interior contrasts to the relatively mild conditions on the Antarctic Peninsula and the subantarctic islands, which have warmer temperatures and more liquid water. Much of the ocean around the mainland is covered by sea ice. The oceans themselves are a more stable environment for life, both in the water column and on the seabed.
Temperature change due to climate change in Antarctica is not stable over the whole continent. West Antarctica is warming rapidly, while the inland regions are cooled by the winds in Antarctica. Water in the West Antarctic has warmed by 1 °C since year 1955. Further increase in temperature in water and on land will affect the climate, ice mass and life on the continent and have global implications. Present-day greenhouse gas concentrations are higher than ever according to ice cores from Antarctica, which indicates that warming on this continent is not part of a natural cycle and attributable to anthropogenic climate change.
Media related to Deschampsia antarctica at Wikimedia Commons
Data related to Deschampsia antarctica at Wikispecies