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Macquarie Island, Hobart, TAS, Australia

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List World Heritage List
Class Natural
Legal Status Declared property (06/12/1997)
Place ID 105129
Place File No 6/01/101/0007
Statement of Significance
For the official statement of Outstanding Universal Value see the UNESCO site http://whc.unesco.org/en/list/629
 
Official Values
Criterion (VII) Contains superlative natural phenomena
Macquarie Island has exceptional natural beauty and aesthetic importance and contains superlative natural phenomena. The World Heritage values include:
  • spectacular steep escarpments;
  • extensive peat beds;
  • large numbers of lakes, tarns and pools;
  • dramatic changes in vegetation cover due to climatic conditions;
  • extensive congregations of wildlife, including Royal and King penguins, present especially during the breeding season;
  • majestic albatross (4 species) nesting on cliffs which are easily viewed;
  • impressive colonies of elephant seals, allowing ability to view breeding and mating behaviour; and
  • the remote, dramatic and essentially undisturbed location.
Criterion (VIII) Outstanding examples of stages of earth's history
Macquarie Island, formed by the exposure of the ocean crust above sea level at the oceanic plate boundary between the Pacific and Indo-Australian plates, is the only place on earth where tectonic forces have brought oceanic mantle-derived rock to the surface within the context of a currently active plate boundary. The World Heritage values include:
  • above sea level evidence of sea-floor spreading and tectonic processes that occur along a mid-oceanic spreading centre;
  • the only known example of two oceanic plates colliding, producing a ridge and island feature at a major strike slip plate boundary;
  • the only known example of oceanic crust being uplifted as a result of transpression at an ocean-ocean plate boundary;
  • the only known example of an ophiolite (distinctive assemblage of mafic to ultramafic rocks) complex in the process of being formed and currently in its original geological setting;
  • a near-pristine example of an ophiolite;
  • evidence of the structure, processes of formation and geochemistry of lower layers of Earth's lithosphere providing sequences from all crustal levels down to 6 km;
  • an example of the structure and composition of both the oceanic crust and the upper mantle;
  • the only known example of oceanic crust formed by sea-floor spreading which is accessible above sea level and still actively forming, undeformed, and uncontaminated;
  • evidence of the exposure of a segment of a major active plate boundary in an oceanic setting;
  • evidence of continuing tectonic and structural processes, including frequent and large earthquakes and dramatic uplift; and
  • an example of the reversal of geological processes, from tectonic plates moving apart and then reversing movement to collide.
Description
The reserve, an island 34km long and up to 5km wide, is the exposed crest of the Macquarie Ridge Complex. This is a component of the oceanic crust, formed in deep water at a spreading ridge and raised to its present position as the Indian-Australian tectonic plate interacts with the Pacific plate (Christodoulu et al. 1984). It is perhaps the best preserved section on the globe of oceanic crust formed in deep water and now exposed above sea level. Volcanic rocks, mainly pillow lavas with varying proportions of rare massive lava flows, basaltic dykes and various sediments comprise about 80% of the island (Griffin, 1982; Varne and Rubenach, 1972). A study of coccoliths in the nanno/foram ooze, characteristic of ocean floor deposition at depths of between 2,000m and 4,000m (Varne et al., 1969), indicates that the crust was formed during the early or middle Miocene (Quilty et al., 1973). The northern part of the island mainly comprises intrusive rocks apparently derived from deeper crustal levels than the southern section (Griffin and Varne, 1980; Varne and Rubenach, 1973). Dolerite dyke swarms are extensive in the northern region and also around Lusitania Bay and Sandell Bay in the south. Besides the dyke swarms, the northern section is composed mainly of serpentinised peridotite and gabbro masses, although there are small areas of extrusive volcanic rocks.
The main landscape feature is a central rolling plateau 250m-300m above sea level, bounded on all sides by steep cliffs, from the foot of which extends a coastal platform up to 800m wide. Glacial drift up to 20m thick covers much of the plateau and there are several lakes with a combined area of more than 200ha. Numerous smaller lakes, tarns and pools are found both on the plateau and on the raised beach terraces. Soils are gravelly loams and peat. The coastline is generally rocky with a number of offshore islands and stacks (DPWH, 1991).
Climate
Meteorological observations have been carried out at the ANARE (Australian National Antarctic Research Expedition) station on the Isthmus during 1911-1913, 1913-1915 and from 1948 to the present.
The island has a cold temperate oceanic climate. Mean seasonal temperature, measured at sea-level, varies from 6.6?C in summer to 3.3?C in winter. Mean annual precipitation is 901mm, falling over an average of 308 days per annum. Some 70% of winds are westerly, cloud cover averages seven-eighths in all months, and mean daily sunshine ranges from 0.6 hours in June to 3.5 hours in February (DPWH, 1991).
Vegetation
The vascular flora comprises at least 46 species, in addition to 80 moss species and at least 50 hepatic species. Lichens number some 141 species, and there are at least 90 diatoms and 20 other species of freshwater algae. The number of marine algae known around the reserve is over 100 (Lowry et al., 1978; Ricker, 1981, 1987), Antarctic kelp Durvillaea antarctica being dominant (DPWH, 1991). Over 135 mushrooms, 60 cup fungi, 22 slime moulds and 1 false slime mould were recently identified (Commonwealth of Australia, 1996).
Since their introduction to the island, rabbits have modified vegetation alliances in most areas. The rabbit control programme, which commenced in 1978, has led to rapid changes in the growth and to a lesser extent the distribution of many vascular species in the reserve (Copson, 1984).
Four main vegetation formations are recognised: tall tussock grassland, short tussock grassland, mire and feldmark (Selkirk et al., 1990). Tall tussock grassland provides the tallest vegetation cover on the island, there being no trees or tall shrubs. It is dominated by Poa foliosa, either in pure stands or allied with P. cookii and/or Stilbocarpa polaris. Herbfield and short grassland cover areas of the raised beach terraces and the plateau. They also occur on extensive areas of coastal slopes which may previously have been covered by tall tussock grassland associations. Mire occurs on areas of the raised beach terraces, valley bottoms and some poorly drained areas on the plateau and rush Juncus scheuchzerioides is dominant in many areas. Feldmark is the most widespread formation, covering approximately half of the island and occupying the most wind-exposed areas of the plateau region and mountain tops. The cushion-forming Azorella macquariensis is the dominant vascular species in the more sheltered parts of the feldmark.
Fauna
The indigenous fur seal, species unknown, was virtually exterminated within ten years of the island being discovered (Cumpston, 1968). The remaining indigenous mammals are all marine, comprising whales and seals, and include Southern right whale Balaena glacialis, rare sightings of sperm whale Physeter macrocephalus, orca Orcinus orca, the most common whale observed at Macquarie Island, and long fin pilot whale Globicephala melaena, the only other whale to be seen in any numbers around Macquarie Island. The only other positive whale records are southern bottlenose whale Hyperoodon planifrons and Cuviers beaked whale Ziphius cavirostris.
Southern elephant seal Mirounga leonina numbered 110,000 during the mid-1950s (Carrick and Ingham, 1962). New Zealand fur seal Arctocephalus forsteri, sub-Antarctic fur seal A. tropicalis and Antarctic fur seal A. gazella are found. Hookers sea lion Phocarctos hookeri and leopard seal Hydrurga leptonyx visit each winter and spring. Weddell seal Leptonychotes weddelli and crabeater seal Lobodon carcinophagus are very rare vagrants from the south.
Four species of introduced mammal still survive. In 1978 the over wintering population of European rabbit Oryctolagus cuniculus was estimated at 150,000 (Copson et al., 1981), but in December 1978 control measures were begun using myxomatosis, with an initial overall reduction of more than 50% and in some areas a reduction of over 90% (Brothers et al., 1982). In 1993 the rabbit population was estimated at less than 10,000 (Parks and Wildlife Service of Tasmania, 1994). Feral cat Felis catus numbers 170-250; their disastrous effects on some of the smaller indigenous birds have been well documented by Jones (1977) and Brothers (1985). House mouse Mus musculus and ship rat Rattus rattus both became established on the island in the last century (Cumpston, 1968).
Seventy-two species of birds have been recorded at Macquarie Island, comprising two endemic sub-species which became extinct in the 19th century (banded rail Rallus phillippensis macquariensis and red-fronted parakeet Cyanoramphus novaezelandiae erythrolis), 25 breeding species, four probably breeding, 38 non-breeding species and three species of domestic poultry which are no longer on the island). The breeding bird fauna includes four penguin species, four albatrosses, fourteen petrels, two ducks, two passerine, one species each of rail, skua, gull, tern, and an endemic sub-species of king cormorant Phalacrocorax albiventer purpurascens, estimated at 660 pairs (Brothers, 1985).
Penguins are the most numerous birds breeding on the island at the present day. King penguin Aptenodytes patagonicus has recovered dramatically from the slaughter of the last century and the population, estimated at 400,000 in 1989, is still expanding (Rounsevell and Copson, 1982; Scott, 1994); gentoo penguin Pygoscelis papua papua population in the area is about 5,000 breeding pairs (Robertson, 1986; Rounsevell and Brothers, 1984); royal penguin Eudyptes schelegli is endemic to the MacQuarie Island (Woelher. 1984), with a breeding population of 850,000 in 57 colonies (Copson and Rounsevell, 1987); and rockhopper penguin E. chrysocome breed in medium to large colonies with a total population of 500,000 breeding pairs (Rounsevell and Brothers, 1984).
Wandering albatross Diomedea exulans, black-browed albatross D. melanophrys and grey-headed albatross D. chrysostoma occur in lower numbers than the 1,500-2,000 pairs of light-mantled sooty albatross Phoebetria palpebrata (Copson, 1988; Kerry and Colback, 1972; Tomkins, 1985). No native passerine have been recorded, but redpoll Acanthis flammea and common starling Sturnus vulgaris are both widespread and common. Weka Gallirallus australis scotti were introduced from New Zealand in the mid 1800s as a source of food for the sealers (Cumpston, 1968). They probably contributed significantly to the extinction of the endemic sub-species of land rails and parakeets (Taylor, 1979).
The number of fish recorded around the island is 12 benthic and 21 pelagic species (Williams, 1988). Some 27 species of marine mollusc (64%) are endemic (Dell, 1964).
It has been estimated that the MacQuarie Island fauna has probably less than 300 species of terrestrial invertebrates. Approximately 10 percent are endemic with a few others doubtfully so (Greenslade, 1990).
An annotated checklist of mammals, birds and fish is given in DPWH (1991), and of mammals and birds is given in Commonwealth of Australia (1996).
 
History
Sealers discovered the island in 1810 and inhabited it periodically throughout the 19th century, exterminating the fur seals and greatly reducing the elephant seal population. In 1870, gangs came to exploit the king and royal penguins populations also for oil, eliminating the former. The original elephant seal population of about 93,000 to 110,000 animals was reduced by 70 percent as a result of these operations. The visitors also brought exotic mammals and caused the extermination of two endemic subspecies of land birds.
Condition and Integrity Not Available
Location
About 600 000ha, located in the Southern Ocean, about half way between New Zealand and the Antarctic continent, approximately 1,500km south-south-east of Tasmania. Comprises all those areas of Crown land being the islands known as Macquarie Island, Bishop and Clerk Islets, 37km to the south, Judge and Clerk Islets, 11km to the north, and including all offshore islands, rocks and reefs extending in each case to the low water mark. Also included are surrounding territorial waters to a distance of 12 nautical miles.
Bibliography
Tasmanian Department of Parks, Wildlife and Heritage (1991) Macquarie Island Nature Reserve Management Plan 1991 The Department: Hobart 57pp
Banks, M.R. and Smith, S.J. (eds.) (1987)  Proceedings of the Symposium on Macquarie Island. May 1987. in  Pap. Proc. Roy. Soc. Tas., 122 (1)
Clark, M.R. and Dingwall, P.R.  (1985)  Conservation of islands in the Southern Ocean: a review of the protected areas of Insulantarctica. IUCN. Gland
 

Report Produced  Wed Sep 24 15:27:18 2014