Three Sisters Island (Tasmania)

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Three Sisters Island
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The island is an important site for black-faced cormorants.
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Three Sisters Island
Location of the Three Sisters Island in Bass Strait
Geography
Location Bass Strait
Coordinates 41°07′21″S146°07′41″E / 41.12250°S 146.12806°E / -41.12250; 146.12806 Coordinates: 41°07′21″S146°07′41″E / 41.12250°S 146.12806°E / -41.12250; 146.12806
Area2 ha (4.9 acres)
Administration
State Tasmania
Demographics
Populationunpopulated

The Three Sisters Island or Three Sisters Islands are three small and rocky granite islands, with a collective land area of 2 hectares (4.9 acres), located in the Bass Strait, lying 500 metres (1,600 ft) off the north coast of Tasmania, Australia, between the towns of Penguin and Ulverstone.

Granite A common type of intrusive, felsic, igneous rock with granular structure

Granite is a common type of felsic intrusive igneous rock that is granular and phaneritic in texture. Granites can be predominantly white, pink, or gray in color, depending on their mineralogy. The word "granite" comes from the Latin granum, a grain, in reference to the coarse-grained structure of such a holocrystalline rock. Strictly speaking, granite is an igneous rock with between 20% and 60% quartz by volume, and at least 35% of the total feldspar consisting of alkali feldspar, although commonly the term "granite" is used to refer to a wider range of coarse-grained igneous rocks containing quartz and feldspar.

Island Any piece of sub-continental land that is surrounded by water

An island or isle is any piece of sub-continental land that is surrounded by water. Very small islands such as emergent land features on atolls can be called islets, skerries, cays or keys. An island in a river or a lake island may be called an eyot or ait, and a small island off the coast may be called a holm. A grouping of geographically or geologically related islands, such as the Philippines, is referred to as an archipelago.

Bass Strait Sea strait between the Australian mainland and Tasmania

Bass Strait is a sea strait separating Tasmania from the Australian mainland, specifically the state of Victoria.

Contents

The islands are steep-sided. Their vegetation of sparse coastal scrub is largely limited to their summits. Because landings are difficult owing to the lack of beaches and safe anchoring points they are little affected by human visitation and disturbance, although Australian fur seals haul-out on the lowest of them. Along with the neighbouring Goat Island, they are part of the 37-hectare (91-acre) Three Sisters – Goat Island Nature Reserve. [1]

Hauling-out

Hauling-out is a behaviour associated with pinnipeds temporarily leaving the water. Hauling-out typically occurs between periods of foraging activity. Rather than remain in the water, pinnipeds haul-out onto land or sea-ice for reasons such as reproduction and rest. Hauling-out is necessary in seals for mating and giving birth. Other benefits of hauling-out may include predator avoidance, thermoregulation, social activity, parasite reduction and rest.

Goat Island (Tasmania) small island situated off the north coast of Tasmania

The Goat Island is a small and unpopulated granite island, located in the Bass Strait, lying off the north-west coast of Tasmania, Australia. The island is situated between Penguin and Ulverstone and can be walked to at low tide. It houses a breeding colony of little penguins.

Birds

The island group has been identified as an Important Bird Area (IBA) by BirdLife International because, with up to 400 breeding pairs, it supports over 1% of the world population of black-faced cormorants. [2] Pacific gulls and sooty oystercatchers breed there every year in small numbers, and Caspian terns have nested there. White-bellied sea-eagles forage around the islands. [1]

Important Bird Area area recognized as being globally important habitat for the conservation of birds populations

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.

BirdLife International is a global partnership of conservation organisations that strives to conserve birds, their habitats, and global biodiversity, working with people towards sustainability in the use of natural resources. It is the world's largest partnership of conservation organisations, with over 120 partner organisations.

Black-faced cormorant species of bird

The black-faced cormorant, also known as the black-faced shag, is a medium-sized member of the cormorant family. Upperparts, including facial skin and bill, are black, with white underparts. It is endemic to coastal regions of southern Australia.

See also

Related Research Articles

Goose Island (Tasmania) island in Australia

The Goose Island, part of the Badger Group within the Furneaux Group, is a 109-hectare (270-acre) unpopulated elongated granite island, located in Bass Strait, lying west of the Flinders and Cape Barren islands, Tasmania, south of Victoria, in south-eastern Australia.

Long Island (Tasmania) island in south-eastern Australia

The Long Island, part of the Long Island Group within the Furneaux Group, is a 313-hectare (770-acre) unpopulated granite and dolerite island, located in Bass Strait, lying north-west of the Cape Barren Island in Tasmania, in south-eastern Australia. The island is part of the Franklin Sound Islands Important Bird Area, identified as such by BirdLife International because it holds over 1% of the world populations of six bird species.

Rodondo Island island in Tasmania, Australia

Rodondo Island is a granite island, part of the Rodondo Group, lying in northern Bass Strait, within the state boundaries of Tasmania, Australia. The island is located only 10 kilometres (6.2 mi) south of Wilsons Promontory in Victoria, and 2' of latitude south of the Victoria-Tasmania border at latitude 39°12'S. Rodondo Island is ringed by steep cliffs up to 200 metres (660 ft) high, with an area of 106 hectares and a maximum elevation of 350 metres (1,150 ft) above sea level.

Albatross Island (Tasmania) island in Tasmania, Australia

The Albatross Island, part of the Hunter Island Group, is an 18-hectare (44-acre) island and nature reserve located in Bass Strait, that lies between north-west Tasmania and King Island, Australia.

Gull Island (Tasmania) island in Tasmania, Australia

The Gull Island, part of the Passage Group within the Furneaux Group, is an 8.5-hectare (21-acre) granite island, located in Bass Strait southeast of Cape Barren Island, in Tasmania, in south-eastern Australia. The island is a conservation reserve and with the Passage and Forsyth islands, the Gull Island forms part of the Forsyth, Passage and Gull Islands Important Bird Area (IBA), identified as such by BirdLife International because it supports over 1% of the world populations of little penguins and black-faced cormorants.

Passage Island (Tasmania) island in Australia

The Passage Island, part of the Passage Group within the Furneaux Group, is a 253-hectare (630-acre) granite and dolerite island, located in Bass Strait south of Cape Barren Island, in Tasmania, in south-eastern Australia.

Forsyth Island island in Australia

The Forsyth Island, part of the Passage Group within the Furneaux Group, is a 167-hectare (410-acre) granite island, located in Bass Strait south of Cape Barren Island, in Tasmania, in south-eastern Australia. With the Passage and Gull islands, the Forsyth Island forms part of the Forsyth, Passage and Gull Islands Important Bird Area (IBA), identified as such by BirdLife International because it supports over 1% of the world populations of little penguins and black-faced cormorants.

Night Island (Tasmania) island in Tasmania, Australia

Night Island is a small granite island, with an area of 2.59 ha, is part of the Preservation Island Group, lying in eastern Bass Strait south of Cape Barren Island in the Furneaux Group, Tasmania, Australia.

Big Black Reef

The Big Black Reef, part of the Long Island Group within the Furneaux Group, is a 0.54-hectare (1.3-acre) unpopulated small, flat dolerite island, located in Bass Strait, lying west of Cape Barren Island, Tasmania, in south-eastern Australia.

Inner Little Goose Island

The Inner Little Goose Island, part of the Badger Group within the Furneaux Group, is a 4.5-hectare (11-acre) unpopulated small, round granite island, located in Bass Strait between Goose and Little Goose islands, lying west of the Flinders and Cape Barren islands, Tasmania, south of Victoria, in south-eastern Australia. The island is contained within a conservation area and is part of the Chalky, Big Green and Badger Island Groups Important Bird Area.

Little Goose Island island in Tasmania, Australia

The Little Goose Island, part of the Badger Group within the Furneaux Group, is a 3.6-hectare (8.9-acre) unpopulated flat, round granite island, located in Bass Strait, lying west of the Flinders and Cape Barren islands, Tasmania, south of Victoria, in south-eastern Australia. The island is contained within a nature reserve and is part of the Chalky, Big Green and Badger Island Groups Important Bird Area.

Beagle Island island in Tasmania, Australia

The Beagle Island, part of the Badger Group within the Furneaux Group, is a 1.2-hectare (3.0-acre) unpopulated low, flat granite island, located in Bass Strait, lying west of the Flinders and Cape Barren islands, Tasmania, south of Victoria, in south-eastern Australia. The island is contained within a nature reserve and is part of the Chalky, Big Green and Badger Island Groups Important Bird Area.

Great Dog Island (Tasmania) island in Australia

The Great Dog Island, also known as Big Dog Island, and part of the Great Dog Group within the Furneaux Group, is a 354-hectare (870-acre) granite island, located in Bass Strait, lying south of the Flinders Island and north of the Cape Barren Island, in Tasmania, in south-eastern Australia.

Cat Island (Tasmania) island in Australia

The Cat Island, part of the Babel Group within the Furneaux Group, is a 39-hectare (96-acre) unpopulated granite island, located in Bass Strait, lying off the east coast of Flinders Island, Tasmania, south of Victoria, in south-eastern Australia.

Storehouse Island Granite island in Tasmania, Australia

The Storehouse Island, part of the Babel Group within the Furneaux Group, is a 20-hectare (49-acre) unpopulated granite island, located in Bass Strait, lying off the east coast of Flinders Island, Tasmania, south of Victoria, in south-eastern Australia.

Shag Reef

Shag Reef, part of the Sister Islands Conservation Area, is a small granite island, with an area of 1.24 hectares located in Bass Strait, Tasmania, Australia.

Ninth Island island in Bass Strait, Australia

The Ninth Island, part of the Waterhouse Island Group, is a 32-hectare (79-acre) uninhabited granite island situated in Bass Strait, lying close to the north-eastern coast of Tasmania, Australia. In November 2018, it was listed for sale for the fourth time, at $1.98 million. The property for sale is a landlocked title within a conservation covenant, preventing access to the island by any means except helicopter.

Little Waterhouse Island island in Tasmania, Australia

The Little Waterhouse Island, part of the Waterhouse Island Group, is a 2.5-hectare (6.2-acre) granite island situated in Banks Strait, part of Bass Strait, lying close to the north-eastern coast of Tasmania, Australia.

Big Caroline Rock island in Australia

The Big Caroline Rock is an unpopulated island located close to the south-western coast of Tasmania, Australia. Situated near where the mouth of Port Davey meets the Southern Ocean, the 2.2-hectare (5.4-acre) island is part of the Swainson Islands Group, and comprises part of the Southwest National Park and the Tasmanian Wilderness World Heritage Site.

References

  1. 1 2 BirdLife International. (2011). Important Bird Areas factsheet: Three Sisters (Bass Strait). Downloaded from http://www.birdlife.org on 2011-11-05.
  2. "IBA: Three Sisters (Bass Strait)". Birdata. Birds Australia. Retrieved 4 November 2011.