|Location||Great Australian Bight|
- 1 Description
- 2 Formation, geology and oceanography
- 3 Flora and fauna
- 4 History
- 5 Navigation aids
- 6 Climate
- 7 Economic activity
- 8 Protected areas
- 9 Cultural heritage
- 10 See also
- 11 References
- 12 External links
The Neptune Islands consists of two groups of islands, the North Neptune Islands and the South Neptune Islands. These both sit on the southern aspect of the Australasian continental shelf separated by a distance of 9 km (5.6 mi). The North Neptune Islands which are 27.8 km (17.3 mi) south south-east from the mainland at Cape Catastrophe, consist of a large island of 49 m (161 ft) height and a small islet of 29 m (95 ft) height located 300 m (980 ft) from the main island's north-east point with a combined area of 2.43 km2 (0.94 sq mi). The South Neptune Islands which are 38.9 km (24.2 mi) south-south-east from the mainland at Cape Catastrophe are more evenly portioned in height with the northern island being 35 m (115 ft) high and the southern island (also known as Lighthouse Island) rising to 37 m (121 ft). The Southern group has an area of 2.02 km2 (0.78 sq mi). A third feature associated with the overall island group is an outcrop of rocks known as Low Rocks located about 6.5 km (4.0 mi) north-north-east of the northern group of islands.
Formation, geology and oceanography
The islands are remnant igneous inselbergs which have survived the erosive process associated with sea level rise. The remnant rock is described as being ‘a porphyritic granite gneiss and pink granite intruded with dolerite dykes‘. Remnants of the once-overlying calcarenite layers are also present on the upper platforms of the island. The soil is mainly derived from the weathering of the granite with a minor contribution from the weathering of calcarenite strata.
The seabed falls steeply away from the coast of both island groups. Water depths of 80 m (260 ft) are reached within a distance of 1.5 km (0.93 mi) from the Northern group and within 1.5 km to 2 km (1.2 mi) from the Southern group.
Flora and fauna
While the low profile of the islands do limit what can grow due to wind exposure and salt spray, surveys have shown that the Northern island group (excluding the ‘small satellite islet’) has 35 plant species while the Southern group has 28 species on its north island while Lighthouse Island has 13 species. The latter is attributed to combination of the disturbance caused by activity associated with the formerly-manned lighthouse, airstrip, an introduced goat population that was eradicated in 1968 and burrows made by the large numbers of short-tailed shearwaters. Plant species include sea celery, leek lily, flax lily, coast tussock grass, salt couch, billy button daisies, variable groundsel and an introduced Northern Hemisphere grass, rat's-tail fescue.
The only mammals present are bush rats which are found on North Neptune Island. Birds of prey include white-bellied sea-eagles, peregrine falcon and swamp harrier with Australian kestrels mainly concentrated on the northern island in the South group. Breeding colonies of Cape Barren geese are present on the Northern group while short-tailed shearwaters, silver gull and greater crested tern are present on the South group island. Other landbirds include white-fronted chats, masked plovers, rock parrots, welcome swallows, silvereyes and stubble quails. Sparrows, an introduced species, have established themselves on Lighthouse island. Reptiles identified during surveys include marbled geckos on both island groups while the following are limited to the main island in the Northern group - four-toed earless skink, bull skinks and western brown snakes. The latter are believed to prey on bush rat and bull shinks. 
New Zealand fur-seals and Australian sea lions are common on all islands, using the island group for breeding. In turn, the presence of these two colonies of sea mammals supports a migratory population of both great white sharks and bronze whaler sharks.
Little penguins were previously found on the Neptune Islands. None were found in 2006 and the colony is now believed to be extinct. Penguins were present there in 1840, 1876, 1899, 1901, 1925 and 1934. In 1899, it was reported that South Neptune Island was "the island abounded with penguin, and the sandy beach was a favourite resort of the hair seal." In 1901, a visiting party on the Governor Musgrave described the island thus: "Penguins are fairly numerous; but excepting an occasional seal or two the mutton birds monopolize the island." Another account of the visit said of the muttonbirds "At night these birds create an indescribable din, in company with the penguins, of which also there is a large number about the various rocks of its coastline."
The islands were first sighted by Europeans on Sunday 21 February 1802 from HMS Investigator whilst under the command of Matthew Flinders. The islands were named ‘Neptune's Isles’, 'for they seemed to be inaccessible to men.' The islands were subsequently visited by John Lort Stokes in 1840 and later in 1873-74 by Captain F. Howard, RN as part of an ongoing South Australian Government program to map the colony’s waters, identify shipping hazards and assess the suitability of the coastline for settlement.
During World War II, the Neptune Islands became a strategic military site due to its lighthouse’s location at the approaches to both Spencer Gulf and Investigator Strait. This is evident in the act of the placement of a mine field approximately 25 mi (40 km) west-south west of the Neptune Islands by the German auxiliary cruiser Pinguin during November 1940. A naval depot including huts and observation towers was established on South Neptune Island along with a gun which was regularly fired.
Navigation aids have been located on islands within the Neptune Islands Group since the early 20th century.
The need for a lighthouse in the Neptune Islands was considered for many years during the 19th century due to the Islands’ relatively low elevation. In 1901, the light tower from the Port Adelaide Entrance light was relocated to South Neptune Island. This was eventually replaced by a new structure in 1985 and was transported to Port Adelaide on MV Cape Don to become part of the collection of the South Australian Maritime Museum which opened in 1986. The new lighthouse was converted to automatic operation in 1990 resulting in the departure of the lighthouse keepers and their families.
Coastal weather observations have been obtained by the Australian Bureau of Meteorology at the South Neptune Islands since 1957. Initially, observations were made by the lighthouse keepers residing on the Island at three hourly intervals. As of 2014, observations are made via an automatic weather station (AWS).
Monthly climate statistics
|Climate data for Neptune Island|
|Record high °C (°F)||36.9
|Average high °C (°F)||22.1
|Average low °C (°F)||16.2
|Record low °C (°F)||9.4
|Average rainfall mm (inches)||12.6
|Average rainy days||4.5||4.2||6.8||10.0||15.2||16.9||18.1||17.8||13.9||9.9||7.2||6.8||131.3|
|Source: Bureau of Meteorology|
The waters around the Neptune Islands outside of the protected area (see below) are commercially fished for abalone, marine scalefish, rock lobster and sardine. Bycatch includes commercially attractive species such as giant crab and octopus.
Tourism and other spin-offs
The Neptune Islands, particularly the North Neptune Islands, have been one of the sites used for shark cage diving to view great white sharks in South Australia since the late 1970s. Since 2002, it is the only site within Australia where this activity is legally permitted. The availability of cage diving has attracted professional photographers and others whose efforts are considered by individuals such as Rodney Fox as having 'significantly contributed to worldwide knowledge of shark physiology and behaviour, because film, video, television and print media associated with shark viewing and research activities at the Neptune Islands, have reached a very large global audience'.Other tourist activities include charter fishing, marine mammal watching and cruise ships visits.
Neptune Islands Conservation Park
The Neptune Islands Conservation Park includes all the islands in the Group to low water mark with the exception of Lighthouse Island in the South Neptune Islands and Low Rocks. The park was proclaimed in 1967 mainly to conserve the New Zealand fur seal breeding colony on the southern island of the North Neptune Islands which is one of the largest in Australia. Other features that contributed to the declaration include the small breeding population of Australian sea lions on the North Neptune Islands, Australian sea lion haul out areas located on the South Neptune Islands, and the breeding/nesting populations of Cape Barren goose, white-bellied sea eagle, osprey and peregrine falcon. A marine extension of 2 nautical miles (3.7 km; 2.3 mi) width was declared under the National Parks and Wildlife Act 1972 (SA), to regulate and manage shark berleying activities around both groups of islands.
Neptune Islands Group (Ron and Valerie Taylor) Marine Park
The Neptune Islands Group (Ron and Valerie Taylor) Marine Park consists of two separate areas - the waters within two nautical miles of the coastline of both the North Neptune Islands and the South Neptune Islands at median high water. The northern area is zoned as a habitat protection area with a smaller sanctuary area immediately adjoining the island group while the southern area is zoned for habitat protection. Both areas are also zoned as restricted areas in order to manage access to both the islands and the surrounding waters. The marine park came into existence on 29 November 2012 as part of a state wide network of marine protected areas. When announcing the launch of the marine park network, Jay Weatherill, the South Australian Premier, announced the renaming of the Neptune Islands Group Marine Park to the Neptune Islands Group (Ron and Valerie Taylor) Marine Park in recognition of the Taylors' contribution to 'the conservation of sharks, sea lions and other marine species.'
Administratively, the Neptune Islands Group (Ron and Valerie Taylor) Marine Park entity 'overlays' the entirety of the Neptune Islands Conservation Park. Activities within the dual entity is restricted to 'scientific research, tourism operations, competitions and organised events, commercial film-making (including sound recording and photography), installation of vessel moorings' and any activity that can be argued on a merit basis. Access to both terrestrial and marine areas is controlled by a permit system administered by one government agency.
Little is known about Aboriginal heritage associated with the Neptune Islands. While it is likely that the islands can be seen from the Eyre Peninsula coastline and that the Islands may have more accessible to aboriginal people during the recent ice age than during the present day, Native Title claims lodged in 1996 and 1997 respectively for southern Eyre Peninsula by the Barngarla and the Nauo peoples did not include the Islands.
The keepers' cottages, store, outbuildings, stone fences, stone rainwater tanks, grave sites & footings of the now-removed first lighthouse collectively known as the South Neptune Island Lighthouse Complex are protected under the Heritage Places Act 1993 (SA) and the Development Act 1993 (SA).
- Frances, cutter, wrecked at South Neptune Island on 29 August 1840.
- Venus, cutter, wrecked at North Neptune Island on 14 June 1946.
- Yandra, motor vessel, ran aground in dense fog onto South Neptune Island on 25 January 1959.
- Saint Michele, fishing boat, wrecked at South Neptune Island on 30 March 1965.
- Gloridia V, cray-fishing boat, wrecked at North Neptune Island on 12 March 1977.
- Cinderella, fishing boat, wrecked at Low Rocks on 24 May 1982.
- Gypsy Rose, fishing boat, wrecked on South Neptune Island on 14 January 1988.
As of October 2013, the only major shipping casualty has been Yandra which, ironically, was serving as the lighthouse’s supply ship at the time of her loss.
- Robinson, A. C.; Canty, P.; Mooney, T.; Rudduck, P. (1996). "South Australia's offshore islands" (PDF). Australian Heritage Commission. pp. 223–226. Retrieved 13 December 2013.
- Gulf of St Vincent and approaches (chart no. 1762). Hydrographic Department, Ministry of Defence (reproduced by the Royal Australian Navy Hydrographic Service). 1983.
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- "Latest from Port Lincoln". Southern Australian. 3 November 1840. p. 3. Retrieved 12 February 2014.
- "Egging Expedition" South Australian Register, South Australia (1876-11-29). Retrieved 2014-02-15.
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- Muirhead, C. M. "A Yachting Cruise. Old-time memories." The Register, South Australia (1925-12-07). Retrieved 2014-03-02.
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- "Neptune Island Lighthouse - Ready for service - A valuable guiding light." The Advertiser, South Australia (1901-10-26). Retrieved 2014-02-15.
- Flinders, Matthew (1966) . A Voyage to Terra Australis : undertaken for the purpose of completing the discovery of that vast country, and prosecuted in the years 1801, 1802, and 1803 in His Majesty's ship the Investigator, and subsequently in the armed vessel Porpoise and Cumberland Schooner; with an account of the shipwreck of the Porpoise, arrival of the Cumberland at Mauritius, and imprisonment of the commander during six years and a half in that island. (Facsimile ed.). Adelaide; Facsimile reprint of: London : G. and W. Nicol, 1814 ed. In two volumes, with an Atlas (3 volumes): Libraries Board of South Australia. p. 229. Retrieved 9 March 2013.
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- Waters, Sidney David (1949). German Raiders in the Pacific. Wellington, New Zealand: War History Branch, Department of Internal Affairs. p. 25. Retrieved 1 November 2013.
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- "South Neptune Island Lighthouse Complex (including Keepers' Cottages, Store, Outbuildings, the Island Reserve, Stone Fences, Stone Rainwater Tanks, Grave Sites & Foundations of the removed Lighthouse), Neptune Islands Conservation Park". South Australian Heritage Register. Department of Environment, Water and Natural Resources. Retrieved 12 February 2016.
- "Listed by State (i.e. lighthouses & navigation aids)". Australian Lighthouses. Retrieved 16 March 2014.
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- Shipwrecks and sea rescue: Lighthouses - increasing the coverage’ at SA Memory, http://www.samemory.sa.gov.au/site/page.cfm?u=706, retrieved 30/06/2012.
- Harry, Bruce (1987). "Conservation of the former Neptune Islands Lighthouse at Port Adelaide". ICCM Bulletin. Australian Institute for the Conservation of Cultural Material. 13 (1 & 2): 83. Retrieved 21 March 2013.
- Robinson, A. C.; Canty, P.; Mooney, T.; Rudduck, P. (1996). "South Australia's offshore islands" (PDF). Australian Heritage Commission. pp. 131–132. Retrieved 13 December 2013.
- "Climate Data Sites (Site information for Neptune Island (sic))". Australian Government, Bureau of Meteorology. Retrieved 23 March 2014.
- "South Australian Coastal Weather Station Details". Australian Government, Bureau of Meteorology. Retrieved 23 March 2014.
- "Neptune Island". Climate statistics for Australian locations. Bureau of Meteorology. November 2015. Retrieved 26 November 2015.
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- Baker, J.L (2004). Towards a System of Ecologically Representative Marine Protected Areas in South Australian Marine Bioregions - Technical Report. Part 3 (PDF). Department for Environment and Heritage, South Australia. pp. 71–74.
- "NEPTUNE ISLANDS GROUP (Ron and Valerie Taylor) MARINE PARK MANAGEMENT PLAN 2012" (PDF). Department of Environment Water and Natural Resources. p. 6. Retrieved 13 December 2013.
- Huveneers, C.; Rogers, P.J.; Semmens, J.; Beckmann, C.; Kock, A.A.; Page, B.; Goldsworthy, S.D (2012). Effects of the Shark Shield™ electric deterrent on the behaviour of white sharks (Carcharodon carcharias). Final Report to SafeWork South Australia. (PDF). Adelaide: South Australian Research and Development Institute (Aquatic Sciences),. p. 15.
- "Shark cage diving". Department of Environment, Water and Natural Resources. Retrieved 12 December 2013.
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- "Neptune Islands Group Ron and Valerie Taylor Marine Park Management Plan" (PDF). Department of Environment, Water and Natural Resources. pp. 12, 13 & 15. Retrieved 31 May 2014.
- "South Australian Marine Parks take effect today" (PDF). South Australian Government. Retrieved 29 November 2012.
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- Department of Environment and Natural Resources (2010), Environmental, Economic and Social Values of the Neptune Islands Group Marine Park, Department of Environment and Natural Resources, South Australia, pp.5
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North Neptune IslandSouth Neptune Island