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Satellite image of the southern tip of Heard Island. Cape Arkona is seen on the left side of the image, with Lied Glacier just above and Gotley Glacier just below. Big Ben Volcano and Mawson Peak are seen at the lower right side of the image.
Location of Heard and McDonald Islands
|Archipelago||Heard Island and McDonald Islands|
|Area||368 km2 (142.1 sq mi)|
|Highest elevation||2,745 m (9,006 ft)|
|Highest point||Mawson Peak|
|Population||0 (as of 1 January 2011)|
|Density||0 /km2 (0 /sq mi)|
|Official name: Heard and McDonald Islands|
|Designated:||1997 (21st session)|
The Heard Island and McDonald Islands (abbreviated as HIMI) are an Australian external territory and volcanic group of barren Antarctic islands, about two-thirds of the way from Madagascar to Antarctica. The group's overall size is 372 square kilometres (144 sq mi) in area and it has 101.9 km (63 mi) of coastline. Discovered in the mid-19th century, they have been territories of Australia since 1947 and contain the only two active volcanoes in Australian territory, the summit of one of which, Mawson Peak, is higher than any mountain on the Australian mainland. They lie on the Kerguelen Plateau in the Indian Ocean.
The islands are among the most remote places on Earth: They are located approximately 4,099 km (2,547 mi) southwest of Perth, Western Australia, 3,845 km (2,389 mi) southwest of Cape Leeuwin, Australia, 4,200 km (2,600 mi) southeast of South Africa, 3,830 km (2,380 mi) southeast of Madagascar, 1,630 km (1,010 mi) north of Antarctica, and 450 km (280 mi) southeast of Kerguelen. The islands are currently uninhabited.
Heard Island, by far the largest of the group, is a 368-square-kilometre (142 sq mi) bleak and mountainous island located at ) and dominated by Mawson Peak, a 2,745-metre (9,006 ft) high complex volcano which forms part of the Big Ben massif. A July 2000 satellite image from the University of Hawaii's Institute of Geophysics and Planetology (HIGP) Thermal Alert Team, University of Hawai'i showed an active 2-kilometre (1.2 mi) long (and 50–90 metres or 164–295 feet wide) lava flow trending south-west from the summit of Big Ben.. Its mountains are covered in glaciers (the island is 80% covered with ice
Mawson Peak is one of only 2 active volcanoes in Australian territory, the other being McDonald Island. It is also one of the highest Australian mountains (higher than Mount Kosciuszko); surpassed only by peaks in the Antarctic territory. A long thin sand and gravel spit named "Elephant Spit" extends from the eastern end of the island. There is a small group of islets and rocks about 10 kilometres (6 mi) north of Heard Island, consisting of Shag Islet, Sail Rock, Morgan Island and Black Rock. They total about 1.1 square kilometres (0.4 sq mi) in area.
The McDonald Islands are located 44 kilometres (27 mi) to the west of Heard Island at . The islands are small and rocky. In 1980 they consisted of McDonald Island (186 metres (610 ft) high), Flat Island (55 metres (180 ft) high) and Meyer Rock (170 metres (560 ft) high). They totalled approximately 2.5 square kilometres (1.0 sq mi) in area, where McDonald Island was 1.13 square kilometres (0.4 sq mi) large. Like Heard Island, they were surface exposures of the Kerguelen Plateau.
The volcano on McDonald Island, after being dormant for 75,000 years, became active in 1992 and has erupted several times since. A satellite image taken in 2004 showed that recent volcanic activity had joined McDonald Island and Flat Island into one island and generally doubled the land size of the resultant island. As a result of volcanic activity between November 2000 and the end of 2001 the area of McDonald Island increased to 2.45 square kilometres (0.9 sq mi) and the highest summit now was at least 230 metres (750 ft) high. However, the volcanic activity destroyed nearly all the vegetation on the island. The most recent eruption is thought to have been on 10 August 2005. Currently there is on-going regeneration of vegetation.
Heard Island and the McDonald Islands have no ports or harbours; ships must anchor offshore. The coastline is 101.9 kilometres (63.3 mi), and a 12-nautical-mile (22 km; 14 mi) territorial sea and 200-nautical-mile (370 km; 230 mi) exclusive fishing zone are claimed.
The islands have an Antarctic climate, tempered by their maritime setting. The weather is marked by low seasonal and daily temperature ranges, persistent and generally low cloud cover, frequent precipitation and strong winds. Snowfall occurs throughout the year. Monthly average temperatures at Atlas Cove (at the northwestern end of Heard Island) range from 0.0 °C (32.0 °F) to 4.2 °C (39.6 °F), with an average daily range of 3.7 °C (38.7 °F) to 5.2 °C (41.4 °F) in summer and −0.8 °C (30.6 °F) to 0.3 °C (32.5 °F) in winter. The winds are predominantly westerly and persistently strong. At Atlas Cove, monthly average wind speeds range between around 26 to 33.5 km/h (16 to 20.8 mph). Gusts in excess of 180 km/h (110 mph) have been recorded. Annual precipitation at sea level on Heard Island is in the order of 1,300 to 1,900 mm (51.2 to 74.8 in); rain or snow falls on about 3 out of 4 days.
Meteorological records at Heard Island are incomplete, but there is evidence that the local climate is changing. Observations at Atlas Cove indicate an increase in average annual air temperature of almost 1°C between the periods 1948-1954 and 1997-2001.
The islands are part of the Southern Indian Ocean Islands tundra ecoregion that includes several subantarctic islands. In this cold climate plant life is mainly limited to grasses and mosses. Low plant diversity reflects the islands’ isolation, small size, severe climate, the short, cool growing season and, for Heard Island, substantial permanent ice cover. The main environmental determinants of vegetation on subantarctic islands are wind exposure, water availability, parent soil composition, salt spray exposure, nutrient availability, disturbance by trampling (from seabirds and seals) and, possibly, altitude. At Heard Island, exposure to salt spray and the presence of breeding and moulting seabirds and seals are particularly strong influences on vegetation composition and structure in coastal areas .
Evidence from microfossil records indicates that ferns and woody plants were present on Heard Island during the Tertiary (a period with a cool and moist climate.) Neither group of plants is present today, although potential Tertiary survivors include the vascular plant Pringlea antiscorbutica and six moss species. Volcanic activity has altered the distribution and abundance of the vegetation. The vascular flora covers a range of environments and, although only six species are currently widespread, glacial retreat and the consequent connection of previously separate ice-free areas is providing opportunities for further distribution of vegetation into adjacent areas.
Flowering plants and ferns
Low-growing herbaceous flowering plants and bryophytes are the major vegetation components. The vascular flora comprises the smallest number of species of any major subantarctic island group, reflecting its isolation, small ice-free area and severe climate. Twelve vascular species are known from Heard Island, of which five have also been recorded on McDonald Island. None of the vascular species is endemic, although Pringlea antiscorbutica, Colobanthus kerguelensis, and Poa kerguelensis occur only on subantarctic islands in the southern Indian Ocean.
The plants are typically subantarctic, but with a higher abundance of the cushion-forming Azorella selago than other subantarctic islands. Heard Island is the largest subantarctic island with no confirmed human-introduced plants. Areas available for plant colonisation on Heard Island are generally the result of retreating glaciers or new ice-free land created by lava flows. Today, substantial vegetation covers over 20 km2 of Heard Island, and is best developed on coastal areas at elevations below 250 m.
Mosses and liverworts
Bryophytes (mosses and liverworts) contribute substantially to the overall biodiversity of Heard Island, with 43 mosses and 19 liverworts being recorded, often occupying habitats unsuitable for vascular plants, such as cliff faces. Bryophytes are present in most of the major vegetation communities including several soil and moss-inhabiting species. A 1980 survey of McDonald Island found lower diversity than that on Heard Island; four mosses and a number of algal species are recorded from there.
At least 100 species of terrestrial algae are known from Heard Island, commonly in permanently moist and ephemeral habitats. Forests of the giant Antarctic kelp Durvillaea antarctica occur at a number of sites around Heard Island and at least 17 other species of seaweed are known, with more to be added following the identification of recent collections. Low seaweed diversity is due to the island's isolation from other land masses, unsuitable beach habitat, constant abrasion by waves, tides and small stones, and the extension of glaciers into the sea in many areas.
Heard Island has a range of terrestrial environments in which vegetation occurs. Seven general vegetation communities are currently recognised, although vegetation composition is considered more of a continuum than discrete units:
- Open cushionfield vegetation is the most widespread and abundant vegetation type on Heard Island. It is characterised by Azorella selago cushions interspersed with bryophytes, small vascular species and bare ground with 20–75% cover, and found mainly at altitudes between 30–70m asl.
- Fellfield describes vegetation with abundant bare ground and less than 50% plant cover. Fellfield may occur as a result of harsh climatic and/or edaphic factors, or recent deglaciation which has exposed bare ground.
- Mossy fellfield is a community with high species richness and consists of bryophytes and small Azorella selago cushions. It is found at altitudes between 30–150 m in areas with intermediate exposure.
- Wet mixed herbfield occurs on moist substrate, mostly on moraines and moist lee slopes (often in association with burrowing petrels colonies) at low altitude (< 40 m) where the water table is at or close to the surface. Species richness is highest here of all the communities, with dominant species being Poa cookii, Azorella selago, Pringlea antiscorbutica, Acaena magellanica, and Deschampsia antarctica.
- Coastal biotic vegetation is dominated by Poa cookii and Azorella selago, occurring mainly on coastal sites of moderate exposure and in areas subject to significant influence from seals and seabirds.
- Saltspray vegetation is dominated by the salt-tolerant moss Muelleriella crassifolia and limited in extent, being found at low elevations on lavas in exposed coastal sites.
- Closed cushionfield is found on moraines and sand at altitudes mostly below 60 m, and is dominated almost entirely by Azorella selago cushions that often grow together to form continuous carpets which can be subject to burrowing by seabirds.
One of the most rapidly changing physical settings in the subantarctic has been produced on Heard Island by a combination of rapid glacial recession and climate warming. The consequent increase in habitat available for plant colonisation, plus the coalescing of previously discrete ice-free areas, has led to marked changes in the vegetation of Heard Island in the last 20 years or so. Other species and vegetation communities found on subantarctic islands north of the Antarctic Convergence now absent from the Heard Island flora may colonise the island if climate change produces more favourable conditions.
Some plant species are spreading and modifying the structure and composition of communities, some of which are also increasing in distribution. It is likely that further changes will occur, and possibly at an accelerated rate. Changes in population numbers of seal and seabird species are also expected to affect the vegetation by changing nutrient availability and disturbance through trampling.
One plant species on Heard Island, Poa annua, a cosmopolitan grass native to Europe, was possibly introduced by humans, though is more likely to have arrived naturally, probably by skuas from the Kerguelen Islands where it is widespread. It was initially recorded in 1987 in two recently deglaciated areas of Heard Island not previously exposed to human visitation, while being absent from known sites of past human habitation. Since 1987 Poa annua populations have increased in density and abundance within the original areas and have expanded beyond them. Expeditioner boot traffic during the Australian Antarctic program expedition in 1987 may be at least partly responsible for the spread, but it is probably mainly due to dispersal by wind and the movement of seabirds and seals around the island.
The potential for introducing additional plant species (including invasive species not previously found on subantarctic islands) by both natural and human-induced means is high. This is due to the combination of low species diversity and climatic amelioration. During the 2003/04 summer a new plant species, Cotula plumosa, was recorded. Only one small specimen was found growing on a coastal river terrace that had experienced substantial development and expansion of vegetation over the past decade. The species has a circumantarctic distribution and occurs on many subantarctic islands.
71 species of lichens have been recorded from Heard Island and they are common on exposed rock, dominating the vegetation in some areas. As with plants, a 1980 survey of McDonald Island found lower diversity there, with just eight lichen species and a number of non-lichenized fungi recorded.
Sealing at Heard Island came to an end in the late 19th century, after the seal populations there had either become locally extinct or reduced to levels too low to exploit economically. Since then the populations have generally increased and are protected. Seals breeding on Heard include the Southern Elephant Seal, the Antarctic fur seal and the Subantarctic fur seal. Leopard Seals visit regularly in winter to haul-out though they do not breed on the islands. Crabeater, Ross and Weddell Seals are occasional visitors.
Heard Island and the McDonald Islands are free from introduced predators and provide crucial breeding habitat in the middle of the vast Southern Ocean for a range of birds. The surrounding waters are important feeding areas for birds and some scavenging species also derive sustenance from their co-habitants on the islands. The islands have been identified by BirdLife International as an Important Bird Area because they support very large numbers of nesting seabirds.
Nineteen species of birds have been recorded as breeding on Heard Island and the McDonald Islands, although recent volcanic activity at the McDonald Islands in the last decade is likely to have reduced vegetated and un-vegetated nesting areas.
Penguins are by far the most abundant birds on the islands, with four breeding species present, comprising King, Gentoo, Macaroni and Eastern Rockhopper Penguins. The penguins mostly colonise the coastal tussock and grasslands of Heard Island, and have previously been recorded as occupying the flats and gullies on McDonald Island.
Other seabirds recorded as breeding at Heard Island include three species of albatross (Wandering, Black-browed and Light-mantled Albatrosses, Southern Giant Petrels, Cape Petrels, four species of burrowing petrels Antarctic and Fulmar Prions, Common and South Georgian Diving-Petrels), Wilson's Storm-Petrels, Kelp Gulls, Subantarctic Skuas, Antarctic Terns and the Heard Shag. Although not a true seabird, the Heard Island subspecies of the Black-faced Sheathbill also breeds on the island. Both the shag and the sheathbill are endemic to Heard Island.
A further 28 seabird species are recorded as either non-breeding visitors or have been noted during 'at-sea surveys' of the islands. All recorded breeding species, other than the Heard Island Sheathbill, are listed marine species under the Australian Environmental Protection and Biodiversity Act (1999, four are listed as threatened species and five are listed migratory species. Under the EPBC Act a recovery plan has been made for albatrosses and giant petrels, which calls for ongoing population monitoring of the species found at HIMI, and at the time of preparing this Plan a draft recovery plan has also been made for the Heard Island cormorant (or shag) and Antarctic tern.
The recorded populations of some seabird species found in the Reserve have shown marked change. The King Penguin population is the best studied seabird species on Heard Island and has shown a dramatic increase since first recorded in 1947/48, with the population doubling every five years or so for more than 50 years.
A paper reviewing population data for the Black-browed Albatross between 1947 and 2000/01 suggested that the breeding population had increased to approximately three times that present in the late 1940s, although a Convention for the Conservation of Antarctic Marine Living Resources CCAMLR) Working Group was cautious about the interpretation of the increasing trend given the disparate nature of the data, as discussed in the paper. The discovery of a large, previously unknown, colony of Heard Shags in 2000/01 at Cape Pillar raised the known breeding population from 200 pairs to over 1000 pairs. On the other hand, the breeding population of Southern Giant Petrels decreased by more than 50% between the early 1950s and the late 1980s.
Terrestrial, freshwater and coastal invertebrates
|This section does not cite any references or sources. (January 2012)|
Heard Island supports a relatively low number of terrestrial invertebrate species compared to other Southern Ocean islands, in parallel with the low species richness in the flora–that is, the island's isolation and limited ice-free area. Endemism is also generally low and the invertebrate fauna is exceptionally pristine with few, if any, (successful) human-induced introductions of alien species. Two species, including the thrip Apterothrips apteris and the mite Tyrophagus putrescentiae are thought to be recent, possibly natural, introductions. An exotic species of earthworm Dendrodrilus rubidus was also collected in 1929 from a dump near Atlas Cove, and has recently been collected from a variety of habitats including wallows, streams and lakes on Heard Island.
The arthropods of Heard Island are comparatively well known with 54 species of mite and tick, one spider and eight springtails recorded. A study over summer at Atlas Cove in 1987/88 showed overall densities of up to 60 000 individual springtails per square metre in soil under stands of Pringlea antiscorbutica. Despite a few recent surveys, the non-arthropod invertebrate fauna of Heard Island remain poorly known.
Beetles and flies dominate Heard Island's known insect fauna, which comprises up to 21 species of ectoparasite (associated with birds and seals) and up to 13 free-living species. Approximately half of the free-living insects are habitat-specific, while the remainder are generalists found in a variety of habitats, being associated with either supralittoral or intertidal zones, Poa cookii and Pringlea antiscorbutica stands, bryophytes, lichen-covered rocks, exposed rock faces or the underside of rocks. There is a pronounced seasonality to the insect fauna, with densities in winter months dropping to a small percentage (between 0.75%) of the summer maximum. Distinct differences in relative abundances of species between habitats has also been shown, including a negative relationship between altitude and body size for Heard Island weevils.
The fauna of the freshwater pools, lakes, streams and mires found in the coastal areas of Heard Island are broadly similar to those on other subantarctic islands of the southern Indian Ocean. Many species reported from Heard Island are found elsewhere. Some sampling of freshwater fauna has been undertaken during recent expeditions and records to date indicate that the freshwater fauna includes a species of Protista, a gastrotrich, two species of tardigrade, at least four species of nematode, 26 species of rotifer, six species of annelid and 14 species of arthropod.
As with the other shore biota, the marine macro-invertebrate fauna of Heard Island is similar in composition and local distribution to other subantarctic islands, although relatively little is known about the Heard Island communities compared with the well-studied fauna of some other islands in the subantarctic region, such as Macquarie and Kerguelen.
Despite Heard Island's isolation, species richness is considered to be moderate, rather than depauperate, although the number of endemic species reported is low. The large macro-alga Durvillaea antarctica supports a diverse array of invertebrate taxa and may play an important role in transporting some of this fauna to Heard Island.
The rocky shores of Heard Island exhibit a clear demarcation between fauna of the lower kelp holdfast zone and the upper shore zone community, probably due to effects of desiccation, predation and freezing in the higher areas. The limpet Nacella kerguelensis is abundant in the lower part of the shore, being found on rock surfaces and on kelp holdfasts. Other common but less abundant species in this habitat include the chiton Hemiarthrum setulosum and the starfish Anasterias mawsoni. The amphipod Hyale sp. and the isopod Cassidinopsis sp. are closely associated with the kelp. Above the kelp holdfast zone, the littornid Laevilitorina (Corneolitorina) heardensis and the bivalve mollusc Kidderia bicolor are found in well-sheltered situations, and another bivalve Gaimardia trapesina trapesina has been recorded from immediately above the holdfast zone. Oligochaetes are also abundant in areas supporting porous and spongy layers of algal mat.
Heard Island has a number of small wetland sites scattered around its coastal perimeter, including areas of wetland vegetation, lagoons or lagoon complexes, rocky shores and sandy shores, including the Elephant Spit. Many of these wetland areas are separated by active glaciers. There are also several short glacier-fed streams and glacial pools. Some wetland areas have been recorded on McDonald Island but, due to substantial volcanic activity since the last landing was made in 1980, their present extent is unknown.
The HIMI wetland is listed on the Directory of Important Wetlands in Australia and, in a recent analysis of Commonwealth-managed wetlands, was ranked highest for nomination under the Convention on Wetlands of International Importance Especially as Waterfowl Habitat (Ramsar Convention) as an internationally important wetland.
Six wetland types have been identified from HIMI covering approximately 1860 ha: coastal ‘pool complex’ (237 ha); inland ‘pool complex’ (105 ha); vegetated seeps mostly on recent glaciated areas (18 ha); glacial lagoons (1103 ha); non-glacial lagoons (97ha); Elephant Spit (300 ha) plus some coastal areas. On Heard Island, the majority of these types suites are found below 150m asl. The wetland vegetation occurs in the ‘wet mixed herbfield’ and ‘coastal biotic vegetation’ communities described above.
The wetlands provide important breeding and feeding habitat for a number of Antarctic and subantarctic wetland animals. These include the southern elephant seal and macaroni, gentoo, king and southern rockhopper penguins, considered to be wetland species under the Ramsar Convention. Non-wetland vegetated parts of the islands also support penguin and other seabird colonies.
Neither island-cluster had recorded visitors until the mid-1850s. Peter Kemp, a British sealer, may have become the first person to have seen the island[which?]. On 27 November 1833, he spotted it from the brig Magnet during a voyage from Kerguelen to the Antarctic and was believed[by whom?] to have entered the island on his 1833 chart.
An American sealer, Captain John Heard, on the ship Oriental, sighted Heard Island on 25 November 1853, en route from Boston to Melbourne. He reported the discovery one month later and had the island named after him. Captain William McDonald aboard the Samarang discovered the nearby McDonald Islands six weeks later, on 4 January 1854.
No landing took place on the islands until March 1855, when sealers from the Corinthian, led by Captain Erasmus Darwin Rogers, went ashore at a place called Oil Barrel Point. In the sealing period from 1855 to 1880 a number of American sealers spent a year or more on the island, living in appalling conditions in dark smelly huts, also at Oil Barrel Point. At its peak the community consisted of 200 people. By 1880 sealers had wiped out most of the seal population and then left the island. In all the islands furnished more than 100,000 barrels of elephant-seal oil during this period.
A number of wrecks have occurred in the vicinity of the islands. There is also a discarded building left from John Heard's sealing station which is situated near Atlas Cove.
Amateur radio DXpeditions to the island took place in January 1997 and in January 1983. Another is planned for 2014.
Administration and economy
The United Kingdom formally established its claim to Heard Island in 1910, marked by the raising of the Union Jack and the erection of a beacon by Captain Evensen, master of the Mangoro. Effective government, administration and control of Heard Island and the McDonald Islands was transferred to the Australian government on 26 December 1947 at the commencement of the first Australian National Antarctic Research Expedition (ANARE) to Heard Island, with a formal declaration that took place at Atlas Cove. The transfer was confirmed by an exchange of letters between the two governments on 19 December 1950.
The islands are a territory (Territory of Heard Island and McDonald Islands) of Australia administered from Hobart by the Australian Antarctic Division of the Australian Department of the Environment and Water Resources. They are populated by large numbers of seal and bird species. The islands are contained within a 65,000-square-kilometre (25,000 sq mi) marine reserve and are primarily visited for research. There is no permanent human habitation.
From 1947 until 1955 there were camps of visiting scientists on Heard Island (at Atlas Cove in the northwest, which was in 1969 again occupied by American scientists and expanded in 1971 by French scientists) and in 1971 on McDonald Island (at Williams Bay). Later expeditions used a temporary base at Spit Bay in the east, such as in 1988, 1992–93 and 2004–05.
With no population, there is no indigenous economic activity. The islands' only natural resource is fish; the Australian government allows limited fishing in the surrounding waters. Despite the lack of population, the islands have been assigned the country code HM in ISO 3166-1 (ISO 3166-2:HM) and therefore the Internet top-level domain .hm. The timezone of the islands is UTC+5.
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- Woehler, E.J. (2006). ‘Status and trends of the seabirds of Heard Island, 2000’, in Heard Island: Southern Ocean Sentinel. ed. Green, K. & Woehler, E. Surrey Beattie.
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- Woehler, E. J.; Auman, H. J.; Riddle, M. J. (2002). "Long-term population increase of black-browed albatrosses Thalassarche melanophrys at Heard Island, 1947/1948–2000/2001". Polar Biology 25 (12): 921–927. doi:10.1007/s00300-002-0436-1.
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- Australian Government. (2005) "Heard Island and McDonald Islands Marine Reserve Management Plan". Australian Antarctic Division: Kingston (Tas). ISBN 1-876934-08-5.
- Green, Ken and Woehler Eric. (2006) Heard Island: Southern Ocean Sentinel. Chipping Norton: Surrey Beatty and Sons.
- Scholes, Arthur. (1949) Fourteen men; story of the Australian Antarctic Expedition to Heard Island. Melbourne: F.W. Cheshire.
- Smith, Jeremy. (1986) Specks in the Southern Ocean. Armidale: University of New England Press. ISBN 0-85834-615-X
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- Heard Island and McDonald Islands official website
- World heritage listing for Heard Island and McDonald Islands
- Heard Island and McDonald Islands entry at The World Factbook
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- Wikimedia Atlas of Heard Island and McDonald Islands
- Image gallery of Heard Island and McDonald Island with high quality limited copyright images.
- MODIS satellite image, taken 30 September 2004 and showing a von Kármán vortex street in the clouds, caused by Mawson Peak's effect on the wind
- UNESCO World Heritage site entry
- Fan's page with further historical and geographic information and a map