Beaufort Island is an island in

Antarctica 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 cont ...

Ross Sea The Ross Sea is a deep bay of the Southern Ocean in Antarctica, between Victoria Land and Marie Byrd Land and within the Ross Embayment, and is the southernmost sea on Earth. It derives its name from the British explorer James Clark Ross who ...

. It is the northernmost feature of the

Ross Archipelago Ross Archipelago () is a name for that group of islands which, together with the ice shelf between them, forms the eastern and southern boundaries of McMurdo Sound in Antarctica. The most northerly is Beaufort Island, then comes Ross Island, the D ...

,Beaufort Island TAMDEF Page
, Ohio State University. lying north of Cape Bird,

Ross Island Ross Island is an island formed by four volcanoes in the Ross Sea near the continent of Antarctica, off the coast of Victoria Land in McMurdo Sound. Ross Island lies within the boundaries of Ross Dependency, an area of Antarctica claimed by N ...

. It is approximately in area. It was first charted by

James Clark Ross Sir James Clark Ross (15 April 1800 – 3 April 1862) was a British Royal Navy officer and polar explorer known for his explorations of the Arctic, participating in two expeditions led by his uncle John Ross, and four led by William Edwa ...

in 1841. Ross named the island for

Sir Francis Beaufort Rear-Admiral Sir Francis Beaufort (; 27 May 1774 – 17 December 1857) was an Irish hydrographer, rear admiral of the Royal Navy, and creator of the Beaufort cipher and the Beaufort scale. Early life Francis Beaufort was descended f ...

hydrographer Hydrography is the branch of applied sciences which deals with the measurement and description of the physical features of oceans, seas, coastal areas, lakes and rivers, as well as with the prediction of their change over time, for the primary p ...

to the British

Royal Navy The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by English and Scottish kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years' War against Fr ...

Geography

Beaufort Island is the eroded remains of a

basalt Basalt (; ) is an aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the surface of a rocky planet or moon. More than 90 ...

stratovolcano A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with a summit crater and peri ...

of unknown age. It is semi-circular in shape. The highest point in the island is Paton Peak, at . The island has varied

terrain Terrain or relief (also topographical relief) involves the vertical and horizontal dimensions of land surface. The term bathymetry is used to describe underwater relief, while hypsometry studies terrain relative to sea level. The Latin word ...

and

habitat In ecology, the term habitat summarises the array of resources, physical and biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species habitat can be seen as the physical ...

s. Much of the western side of the island is covered by moderately sloping ice fields with ice cliffs about high on the coast. The east and south sides of the island are mostly free of ice, with steep inaccessible cliffs that rise straight from the sea. Here the ice-free ground has a gentle slope and has ponds in summer and small meltwater streams that drain to the coast. Stonehouse, Bernard, 2002, ''Encyclopedia of Antarctica and the Southern Oceans'', John Wiley and Sons, p. 25, .Antarctic Specially Protected Area (ASPA) No. 105 Beaufort Island, McMurdo Sound, Ross Sea
National Science Foundation.

Ecology

Beaufort Island is designated an

Antarctic Specially Protected Area An Antarctic Specially Protected Area (ASPA) is an area on the continent of Antarctica, or on nearby islands, which is protected by scientists and several different international bodies. The protected areas were established in 1961 under the Antarct ...

to preserve its natural ecological system and to protect its varied and numerous bird species. The island is isolated and difficult to access and is visited infrequently by people. It is largely undisturbed by direct human activity, and there have been fewer opportunities for the introduction of

exotic species An introduced species, alien species, exotic species, adventive species, immigrant species, foreign species, non-indigenous species, or non-native species is a species living outside its native distributional range, but which has arrived there ...

than other locations in the Ross Sea. Although some studies have been conducted on the island, it has not been comprehensively studied.Management Plan for Antarctic Specially Protected Area (ASPA) No. 105
Antarctica New Zealand.

Birds

The island has a small colony of breeding

emperor penguin The emperor penguin (''Aptenodytes forsteri'') is the tallest and heaviest of all living penguin species and is endemic to Antarctica. The male and female are similar in plumage and size, reaching in length and weighing from . Feathers of t ...

s on nearshore sea ice at the northern end, a large

Adélie penguin The Adélie penguin (''Pygoscelis adeliae'') is a species of penguin common along the entire coast of the Antarctic continent, which is the only place where it is found. It is the most widespread penguin species, and, along with the emperor pen ...

colony on a

raised beach A raised beach, coastal terrace,Pinter, N (2010): 'Coastal Terraces, Sealevel, and Active Tectonics' (educational exercise), from 2/04/2011/ref> or perched coastline is a relatively flat, horizontal or gently inclined surface of marine origin, ...

called Cadwalader Beach at the south-western end, and several breeding colonies of

south polar skua The south polar skua (''Stercorarius maccormicki'') is a large seabird in the skua family, Stercorariidae. An older name for the bird is MacCormick's skua, after explorer and naval surgeon Robert McCormick, who first collected the type specimen. ...

. It has been designated an

Important Bird Area An Important Bird and Biodiversity Area (IBA) is an area identified using an internationally agreed set of criteria as being globally important for the conservation of bird populations. IBA was developed and sites are identified by BirdLife Inte ...

BirdLife International BirdLife International is a global partnership of non-governmental organizations that strives to conserve birds and their habitats. BirdLife International's priorities include preventing extinction of bird species, identifying and safeguarding ...

Vegetation

The island has an extensive area of vegetation on a

moraine A moraine is any accumulation of unconsolidated debris ( regolith and rock), sometimes referred to as glacial till, that occurs in both currently and formerly glaciated regions, and that has been previously carried along by a glacier or ice sh ...

bench above the beach at the north end of the island. The moraine bench is up to wide. The vegetation is dominated by the

moss Mosses are small, non-vascular flowerless plants in the taxonomic division Bryophyta (, ) '' sensu stricto''. Bryophyta ('' sensu lato'', Schimp. 1879) may also refer to the parent group bryophytes, which comprise liverworts, mosses, and ...

species ''Bryum argenteum''. It is the most extensive and continuous area of mosses known of in the

McMurdo Sound McMurdo Sound is a sound in Antarctica. It is the southernmost navigable body of water in the world, and is about from the South Pole. Captain James Clark Ross discovered the sound in February 1841, and named it after Lt. Archibald McMurdo ...

region. There is also a diverse community of

algae Algae (; singular alga ) is an informal term for a large and diverse group of photosynthetic eukaryotic organisms. It is a polyphyletic grouping that includes species from multiple distinct clades. Included organisms range from unicellular micr ...

. This location is one of the most southerly locations where red snow algae (''Chlamydomonas'' sp., ''Chloromonas'' sp., and ''Chlamydomonas nivalis'') are found. The location is favourable for vegetation growth because of warm summer temperatures. Its northerly aspect and the shelter provided by high ice cliffs protect against southerly winds. Water is supplied from the ice-cliffs and snow banks.

References

{{Authority control Uninhabited islands of New Zealand Volcanoes of the Southern Ocean Ross Archipelago Antarctic Specially Protected Areas Important Bird Areas of Antarctica Seabird colonies Pleistocene stratovolcanoes Penguin colonies

Geography

Ecology

Birds

Vegetation

See also

References