Thistle Island

Thistle Island is in the Spencer Gulf, South Australia, some 200 kilometres (120 mi) west of Adelaide, and northwest of the Gambier Islands. The city of Port Lincoln lies to the northwest of the island. Between them, the Gambier Islands and Thistle form a chain across the mouth of the gulf between the southern tips of the Yorke and Eyre Peninsulas,[1] sometimes referred to as the Taylor Islands group.

Thistle
Thistle
Geography
LocationSpencer Gulf
Coordinates
Administration
Australia

The island is approximately 17 kilometres (10.5 mi) long and varies in width from 1 kilometre wide (0.6 mi) at its narrowest central part to 4 kilometres (2.5 mi) wide in the south-east part. Whaler's Bay is a wide bay on the east coast of the island, and Albatross Island is a tiny island to the south.

As of 2014 the Royal Australian Navy operated an acoustic range, the South Australian Acoustic Range (SAAR), to help develop sonar techniques for submarines in the waters west of Thistle Island, with a small control facility being located on the island itself.[2]

History

The island was named by British explorer Matthew Flinders in 1802, after a terrible accident in which a cutter that was mastered by John Thistle and carrying 7 other men, overturned in choppy seas while returning from the mainland to the ship. Despite frantic searching by the ships crew, the bodies of the men were never found. Flinders also named several smaller islands in the area after the lost crew.[3]

Evidence of a failed settlement was noted by early whalers. It was speculated that the remains, which "the ruins of some cottages with signs of regular order in their arrangement and a cleared promenade between them, all the loose limestone for a distance of a bout 100 yards having been thrown on each side of a broad path." It was speculated that the ruins may have been built by survivors of the La Perouse expedition of 1788.[4]

A small community of sealers, their Aboriginal "wives" and children were living on the island by 1832. They are thought to have had their camp on the shore of Waterhouse Bay.[5]

The South Australian Company established a shore-based bay whaling station at Whalers Bay in 1838,[6] during the period of British colonisation of South Australia. A team of experienced whalers were brought from Tasmania with H.B.T. McFarlane in charge as headsman. The operation had limited success during the 1838 season and none at all in the 1839 season. It was concluded the location was too far from the migration route of the southern right whale and the site was abandoned.[7]

The historic Whalers Bay Whaling Site and Thistle Island Sealing Site are both listed on the South Australian Heritage Register.[8][9]

Geology

Thistle Island has a crystalline basement overlain by calcareous aeolianite. There are steep cliffs of calcareous aeolianite on the shore. There are recent beach sands on the eastern side, and several small lakes exist on the other sided of a strip of coastal dunes.[6]

Albatross Island, a tiny island predominantly crystalline basement with a thin layer of calcareous aeolianite.[6]

Flora and fauna

Visitors to Thistle Island in 1877 found neither little penguins nor Australian sea lions, but did find numbers of paper nautilus shells on the island's inner beach.[10] Visitors to Whaler's Bay heard the calls of "hundreds" of little penguins from their anchorage there in 1904.[11] In 1932, J. T. Mortlock gave an account from Whaler's Bay of the "mournful symphony of the curlews and penguins in the nearby cliffs".[12]

An account of a visit in 1928 wrote: "On Black Rock, at the north end of Thistle Island, we disturbed a large colony of seals, which rapidly scrambled into the water as the yacht passed by. Shags were plentiful. Many types of sea fowl were observed, including gannet, arctic skua, mollyhawk and stormy petrel."[13]

Former Lord Mayor of Adelaide A. S. Hawker held a fishing record for a 47-pound (21 kg) tuna that he caught off Thistle Island in the late 1930s.[14]

Little penguin breeding sites were noted in a 1996 survey of South Australia's offshore islands,[15] though the colony may have been recorded on Albatross Island, off the island's southern tip.

The island is the home to an introduced population of the greater bilby,[16] originally bred at Monarto Zoo.[17] By October 2020, the population was thriving so well on Thistle Island that it was possible to trap nine bilbies for relocation to the Arid Recovery Reserve near Roxby Downs, to help boost the gene pool there.[18]

References
  1. Collins concise atlas of the world (3rd ed.) (1993). London: HarperCollins.
  2. Morris, Alex (2014). "Submarine Acoustic Analysis Cell goes to SAAR" (PDF). The Trade (2): 15. Archived from the original (PDF) on 5 January 2016.
  3. Matthew Flinders, A voyage to Terra Australis (Chapter 6). Retrieved 25 January 2019
  4. "WHERE ADELAIDE MIGHT HAVE BEEN". Register (Adelaide, SA : 1901 - 1929). 16 February 1904. p. 6. Retrieved 12 July 2020.
  5. Kostoglou & McCarthy, p.57.
  6. Edyvane, K.S. (May 1999). Conserving Marine Biodiversity in South Australia - Part 2 - Identification of areas of high conservation value in South Australia (PDF). No. 39. SARDI. ISBN 0 7308 5238 5.
  7. Kostoglou, Parry; McCarthy, Justin (1991). Whaling and sealing sites in South Australia (First ed.). Fremantle: Australian Institute for Maritime Archaeology. p. 24.
  8. "Whalers Bay Whaling Site, Thistle Island". South Australian Heritage Register. Department of Environment, Water and Natural Resources. Retrieved 12 February 2016.
  9. "Thistle Island Sealing Site (designated place of archaeological significance)". South Australian Heritage Register. Department of Environment, Water and Natural Resources. Retrieved 12 February 2016.
  10. "NATURALIST". Sydney Mail and New South Wales Advertiser (NSW : 1871 - 1912). 16 June 1877. p. 3. Retrieved 9 July 2020.
  11. "Where Adelaide Might Have Been". Register (Adelaide, SA : 1901 - 1929). 16 February 1904. p. 6. Retrieved 12 July 2020.
  12. "Out among the People". Chronicle (Adelaide, SA : 1895 - 1954). 8 September 1932. p. 63. Retrieved 12 July 2020.
  13. "ISLANDS OF REMEMBRANCE". Register (Adelaide, SA : 1901 - 1929). 21 January 1928. p. 12. Retrieved 12 July 2020.
  14. "Out among the People". Chronicle (Adelaide, SA : 1895 - 1954). 19 June 1941. p. 46. Retrieved 12 July 2020.
  15. Robinson, Tony; Canty, Peter; Mooney, Trish; Rudduck, Penny (1996). South Australia's Offshore Islands (PDF). South Australia: Resource Management Branch, Department of Environment and Natural Resources, South Australia. ISBN 0 644 35011 3.
  16. "Baby brings bilbies from brink". Adelaide Now. 27 January 2009. Retrieved 31 August 2020.
  17. "Winter may be the best time to release captive-bred bilbies in southern Australia, research finds". ABC NEws. 18 July 2019. Retrieved 31 August 2020.
  18. Lysaght, Gary-Jon (26 October 2020). "Bilbies released at Arid Recovery to boost population in outback SA". ABC News. Australian Broadcasting Corporation. Retrieved 27 October 2020.
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