The Dales (Christmas Island)

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Designations
Official nameThe Dales, Christmas Island
Designated21 October 2002
Reference no.1225 [1]

The Dales is a wetland site located at the western end of Christmas Island, an Australian external territory in the eastern Indian Ocean. The site has been recognised as being of international importance by designation under the Ramsar Convention on Wetlands.

Wetland A land area that is permanently or seasonally saturated with water

A wetland is a distinct ecosystem that is inundated by water, either permanently or seasonally, where oxygen-free processes prevail. The primary factor that distinguishes wetlands from other land forms or water bodies is the characteristic vegetation of aquatic plants, adapted to the unique hydric soil. Wetlands play a number of functions, including water purification, water storage, processing of carbon and other nutrients, stabilization of shorelines, and support of plants and animals. Wetlands are also considered the most biologically diverse of all ecosystems, serving as home to a wide range of plant and animal life. Whether any individual wetland performs these functions, and the degree to which it performs them, depends on characteristics of that wetland and the lands and waters near it. Methods for rapidly assessing these functions, wetland ecological health, and general wetland condition have been developed in many regions and have contributed to wetland conservation partly by raising public awareness of the functions and the ecosystem services some wetlands provide.

Christmas Island Australian external territory

The Territory of Christmas Island is an Australian external territory comprising the island of the same name. Christmas Island is located in the Indian Ocean, around 350 kilometres (220 mi) south of Java and Sumatra and around 1,550 kilometres (960 mi) north-west of the closest point on the Australian mainland. It has an area of 135 square kilometres (52 sq mi).

Australia Country in Oceania

Australia, officially the Commonwealth of Australia, is a sovereign country comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands. It is the largest country in Oceania and the world's sixth-largest country by total area. The neighbouring countries are Papua New Guinea, Indonesia, and East Timor to the north; the Solomon Islands and Vanuatu to the north-east; and New Zealand to the south-east. The population of 25 million is highly urbanised and heavily concentrated on the eastern seaboard. Australia's capital is Canberra, and its largest city is Sydney. The country's other major metropolitan areas are Melbourne, Brisbane, Perth, and Adelaide.

Contents

History

The Dales were the first location where Europeans set foot on Christmas Island in 1688, during the expedition of William Dampier. Nowadays the Dales are visited by local residents and tourists for sightseeing. One of the subsites, Hugh's Dale, has religious significance for Buddhists of Chinese background. [2]

William Dampier British scientist, pirate and explorer

William Dampier was an English explorer, ex-pirate and navigator who became the first Englishman to explore parts of what is today Australia, and the first person to circumnavigate the world three times. He has also been described as Australia's first natural historian, as well as one of the most important British explorers of the period between Sir Walter Raleigh and James Cook.

Tourism travel for recreational or leisure purposes

Tourism is travel for pleasure or business; also the theory and practice of touring, the business of attracting, accommodating, and entertaining tourists, and the business of operating tours. Tourism may be international, or within the traveller's country. The World Tourism Organization defines tourism more generally, in terms which go "beyond the common perception of tourism as being limited to holiday activity only", as people "traveling to and staying in places outside their usual environment for not more than one consecutive year for leisure and not less than 24 hours, business and other purposes".

Buddhism World religion, founded by the Buddha

Buddhism is the world's fourth-largest religion with over 520 million followers, or over 7% of the global population, known as Buddhists. Buddhism encompasses a variety of traditions, beliefs and spiritual practices largely based on original teachings attributed to the Buddha and resulting interpreted philosophies. Buddhism originated in ancient India as a Sramana tradition sometime between the 6th and 4th centuries BCE, spreading through much of Asia. Two major extant branches of Buddhism are generally recognized by scholars: Theravada and Mahayana.

Description

The site comprises a system of seven watercourses within the Christmas Island National Park, including permanent and perennial streams, permanent springs, the Hugh's Dale waterfall, and most of the surface water on the island. [2] The site is set within tropical rainforest and adjoins the coast. The streams originate from groundwater seepages and flow into the ocean having, over time, worn gullies into the coastal cliffs. [3] It was designated on 21 October 2002 as Ramsar Site 1225, and is the first Australian Ramsar site to contain both surface and subterranean karst features. [2] Area of Ramsar site is about 57 ha. It was also listed on the Directory of Important Wetlands in Australia prior to 2001. [4]

Christmas Island National Park Protected area in Australia

Christmas Island National Park is a national park occupying most of Christmas Island, an Australian territory in the Indian Ocean southwest of Indonesia. The park is home to many species of animal and plant life, including the eponymous red crab, whose annual migration sees around 100 million crabs move to the sea to spawn. Christmas Island is the only nesting place for the endangered Abbott's booby and critically endangered Christmas Island frigatebird, and the wide range of other endemic species makes the island of significant interest to the scientific community.

Stream A body of surface water flowing down a channel

A stream is a body of water with surface water flowing within the bed and banks of a channel. The stream encompasses surface and groundwater fluxes that respond to geological, geomorphological, hydrological and biotic controls.

Tropical rainforest specific ecosystem

Tropical rainforests are rainforests that occur in areas of tropical rainforest climate in which there is no dry season – all months have an average precipitation of at least 60 mm – and may also be referred to as lowland equatorial evergreen rainforest. True rainforests are typically found between 10 degrees north and south of the equator ; they are a sub-set of the tropical forest biome that occurs roughly within the 28 degree latitudes. Within the World Wildlife Fund's biome classification, tropical rainforests are a type of tropical moist broadleaf forest that also includes the more extensive seasonal tropical forests.

Interesting geological features of the Dales are travertine and rimstone formations of Hugh's Dale and the gully of Sydney's Dale, which closer at the sea gets up to 12 m deep and 9 m wide.

Travertine A form of limestone deposited by mineral springs

Travertine is a form of limestone deposited by mineral springs, especially hot springs. Travertine often has a fibrous or concentric appearance and exists in white, tan, cream-colored, and even rusty varieties. It is formed by a process of rapid precipitation of calcium carbonate, often at the mouth of a hot spring or in a limestone cave. In the latter, it can form stalactites, stalagmites, and other speleothems. It is frequently used in Italy and elsewhere as a building material.

Rimstone

Rimstone, also called gours, is a type of speleothem in the form of a stone dam. Rimstone is made up of calcite and other minerals that build up in cave pools. The formation created, which looks like stairs, often extends into flowstone above or below the original rimstone. Often, rimstone is covered with small, micro-gours on horizontal surfaces. Rimstone basins may form terraces that extend over hundreds of feet, with single basins known up to 200 feet long from Tham Xe Biang Fai in Laos

Flora and fauna

The site contains a unique stand of enormous Tahitian chestnut trees. Sydney Dale is a recorded site for the critically endangered endemic fern, the Christmas Island spleenwort. The various wetland types of the Dales support populations of endemic and threatened animals, including the Christmas Island hawk-owl, Christmas Island goshawk, Abbott's booby, Christmas Island shrew and the Christmas Island blind snake. Coastline habitats within the site provide breeding and spawning grounds for red and blue crabs. The main threat to the site comes from introduced species, in particular the yellow crazy ant [2] and the development of Immigration Reception Centre nearby, above the springs.

<i>Inocarpus fagifer</i> species of plant

Inocarpus fagifer, commonly known as the Tahitian chestnut, Polynesian chestnut, aila or mape tree, is a species of flowering plant in the subfamily Faboideae of the legume family, Fabaceae. The tree has a wide range in the tropics of the south-west Pacific and south-east Asian regions, and a history of traditional use by the peoples of Polynesia and Melanesia. It is the only edible and culturally important member of the genus Inocarpus.

Asplenium listeri, commonly known as the Christmas Island spleenwort, is a species of fern in the Aspleniaceae family. It is endemic to Christmas Island, an Australian territory in the north-eastern Indian Ocean. Its specific epithet honours British zoologist and plant collector Joseph Jackson Lister, who visited the island on HMS Egeria in 1887 and was the first to collect a specimen.

Abbotts booby species of bird

Abbott's booby is an endangered seabird of the sulid family, which includes gannets and boobies. It is a large booby, smaller than gannets, and is placed within its own monotypic genus. It was first identified from a specimen collected by William Louis Abbott, who discovered it on Assumption Island in 1892.

Access

The road to the site's car-park is for 4WD vehicles only. There are walking tracks from the car-park to Hugh's Dale and Anderson's Dale, with interpretive signage for visitors. [3]

Four-wheel drive type of drivetrain with four driven wheels

Four-wheel drive, also called 4×4 or 4WD, refers to a two-axled vehicle drivetrain capable of providing torque to all of its wheels simultaneously. It may be full-time or on-demand, and is typically linked via a transfer case providing an additional output drive-shaft and, in many instances, additional gear ranges.

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References

Notes

  1. ↑ "The Dales, Christmas Island". Ramsar Sites Information Service. Retrieved 25 April 2018.
  2. 1 2 3 4 Annotated Ramsar List.
  3. 1 2 Blowholes, beaches... etc.
  4. ↑ Eyles et al, 2001, pages 117 & 120

Sources

Coordinates: 10°28′S105°33′E / 10.467°S 105.550°E / -10.467; 105.550


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