Christmas Island National Park Australia | |
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![]() Dolly Beach in Christmas Island National Park, Australia | |
Nearest town or city | Flying Fish Cove |
Coordinates | 10°25′S105°40′E / 10.417°S 105.667°E |
Established | 1980 |
Area | 85 km2 (32.8 sq mi) |
Managing authorities | Director of National Parks |
Website | Christmas Island National Park |
Christmas Island National Park is a national park occupying most of Christmas Island, an Australian territory in the Indian Ocean southwest of Indonesia. [1] The park is home to many species of animal and plant life, including the eponymous Christmas Island 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. [2]
Concerns were expressed in the early 1970s about the effect of phosphate mining on the flora and fauna of Christmas Island. A particular focus was on the habitat of Abbott's booby (Papasula abbotti), [2] which appeared in danger of extinction. In 1974 a governmental committee examined the environmental impact of mining and other commercial activities and advised on measures to protect the island. [2] The committee's recommendation that an area of the island be set aside for conservation was implemented in a series of measures culminating in the establishment of the Christmas Island National Park on 21 February 1980 under the terms of the National Parks and Wildlife Conservation Act 1975. [2]
The park initially covered the south-west corner of the island, and was extended in 1986 and 1989 to include most of the rainforest on the island. [3] Today the park covers approximately 85 km2 (33 sq mi), or 63% of the island. [1]
Christmas Island consists of an uplifted limestone cap metamorphosed from coral reefs overlying more ancient volcanic andesite bedrock. [4] The underlying seamount lies some 500 km (310 mi) southwest of Indonesia, and the isolation by the abyssal zone has led to endemism amongst the marine ecosystem. The park's boundaries extend 50 m (160 ft) beyond the low water line. [5] Approximately 46 km (29 mi) of the island's 73 km (45 mi) shoreline is within the park limits. [4]
Many stretches of the shoreline are marked by rock platforms, which are filled by wave splashes to create rock pools. Sea cliffs, up to 60 m (200 ft) high in places, rise steeply from the sea and form a series of stepped terraces, the lower cliffs of which are higher and steeper. [4] Soil on the island is generally poor, punctuated by limestone pinnacles, and tends to dehydrate during the dry season. The limestone is fractured and has created a substantial cave system. There are both water-filled and dry caves. [4]
Christmas Island's two Ramsar sites, The Dales and Hosnies Spring, are contained within the park.
Both the waters surrounding the island and its land surface are fecund, and the park exhibits a high level of biodiversity with many endemic species. [5]
The island is particularly noted for its prodigious populations of Christmas Island red crabs (Gecarcoidea natalis), whose mass migrations at spawning time may number over a hundred million individuals. The bright red carapaces and sheer density of crabs make their routes to the sea observable from the air. Nonetheless, the populations of red crabs are threatened by the arrival of the invasive yellow crazy ant (Anoplolepis gracilipes). The ant was accidentally introduced between 1915 and 1934, [6] and without any native ant species to compete against, rapidly formed 'supercolonies' of extremely high density. [7] Populations of the ant have been observed bringing down red crabs over a hundred times their combined biomass. [7] A. gracilipes is thought responsible for killing up to 30 million of the park's crabs. [5]
While the red crab is Christmas Island's most numerous crab, the island also hosts the world's largest population of coconut crab (Birgus latro), [8] the world's largest land invertebrate. [9] There may be as many as one million coconut crabs on Christmas Island. [10] It is also home to several species each of hermit crab, grapsids and gecarcinucoidea. [8]
There are six species of reptile native to the park, of which five are endemic: [2] the giant gecko (Cyrtodactylus sadlieri), the Christmas Island gecko (Lepidodactylus listeri), the forest skink (Emoia nativitatis), the blue-tailed skink (Cryptoblephanus egeriae) and the Christmas Island blind snake (Ramphotyphlops exocoeti). The foreshore skink (Emoia atrocostata) is native to the park, but is also to be found on other islands of the Indian Ocean. All have been showing decline in recent years. [2]
A further five species of reptile have been reported, but all were introduced by human activity: the barking gecko (Hemidactylus frenatus), house gecko (Gehyra mutilata), black blind snake (Ramphotyphlops braminus), wolf snake (Lycodon aulicus capucinus) and grass skink (Subdoluseps bowringii).
There are three species of mammal native to the park: the Christmas Island shrew (Crocidura trichura), listed as critically endangered, and possibly extinct; the small Christmas Island pipistrelle (Pipistrellus murrayi), listed as endangered and showing a rapid decrease in numbers; and the Christmas Island flying fox (Pteropus melanotus). The black rat (Rattus rattus) and house mouse (Mus musculus) have been introduced. Feral cats and dogs are also common, and stray into park territory. [2]
There are over 100 species of birds, of which ten are endemic. Many birds are passing vagrants, such as the great cormorant (Phalacrocorax carbo). Others, like the lesser frigatebird (Fregata ariel), are more regular visitors. Bird populations are threatened due to the invasive yellow crazy ant, and reports have suggested that the ant has attacked hatchlings and harassed adults in their nests. [7] All endemic bird species have been placed on the critically endangered list.
The dominant vegetation on the island is rainforest. Approximately 200 species of native flowering plant are to be found on Christmas Island. [11] There are no mangroves on the park's coast. However, a stand of the normally estuarine mangrove species, Bruguiera gymnorhiza and B. sexangula, is found approximately 50 m (160 ft) above sea level, at Hosnies Spring. [4]
The park is managed by the Director of National Parks whose duties include protection of the park's natural areas, its lifeforms and genetic resources, to maintain ecological diversity, and to manage visitor access for educational, cultural and recreational purposes. It latest management plan (2002) listed control of the yellow crazy ant as its highest priority. [2]
The park administration has a staff of 17, and operates out of an office in Drumsite on the northern side of the island.[ citation needed ]
The yellow crazy ant, also known as the long-legged ant or Maldive ant, is a species of ant, thought to be native to West Africa or Asia. They have been accidentally introduced to numerous places in the world's tropics.
The Christmas Island red crab is a species of land crab that is endemic to Christmas Island and Cocos (Keeling) Islands in the Indian Ocean. Although restricted to a relatively small area, an estimated 43.7 million adult red crabs once lived on Christmas Island alone, but the accidental introduction of the yellow crazy ant is believed to have killed about 10–15 million of these in recent years. Christmas Island red crabs make an annual mass migration to the sea to lay their eggs in the ocean. Although its population is under great assault by the ants, as of 2020 the red crab had not been assessed by the International Union for Conservation of Nature (IUCN) and it was not listed on their Red List. The crab's annual mass migration to the sea for spawning is described as an "epic" event. Millions emerge at the same time, halting road traffic and covering the ground in a thick carpet of crabs.
Norfolk Island National Park is a protected area of 6.50 km2 (2.51 sq mi) located at 29°2′0″S167°56′59″E in the South Pacific Ocean, about 1,471 kilometres off the East coast of Australia. The park’s area includes the Mount Pitt section on the namesake Norfolk Island with an area of 4.60 km2 (1.78 sq mi) / 460 ha, as well as the neighbouring Phillip Island encompassing 1.90 km2 (0.73 sq mi) / 190 ha, and the much smaller Nepean Island. The Norfolk Island group is a Commonwealth of Australia external territory, and is the only place in the world where the Norfolk Island parakeet and the white-chested white-eye occur.
The Christmas imperial pigeon or Christmas Island imperial pigeon, also known as Black imperial pigeon, Dusky imperial pigeon, Wharton's imperial pigeon, or burong pergam, is a large imperial pigeon endemic to Christmas Island in the northeastern Indian Ocean. It has an overall grey-blue colouration, and juveniles are duller than adults. It makes a soft purring coo sound and a deeper whoo sound comparable to a cow mooing. It lays one glossy white egg per brood, and is possibly somewhat colonial.
The Christmas boobook, also known as the Christmas hawk owl, Christmas Island boobook or Christmas Island hawk owl, is a species of owl in the family Strigidae.
The Christmas white-eye is a species of bird in the family Zosteropidae. It is endemic to Christmas Island. Its natural habitats are tropical and subtropical moist broadleaf forests and subtropical or tropical moist shrubland. It is threatened by habitat destruction.
The giant bronze gecko is a species of lizard in the family Gekkonidae endemic to Seychelles.
The Christmas Island shrew, also known as the Christmas Island musk-shrew is an extremely rare or possibly extinct shrew from Christmas Island. It was variously placed as subspecies of the Asian gray shrew or the Southeast Asian shrew, but morphological differences and the large distance between the species indicate that it is an entirely distinct species.
Cryptoblepharus egeriae, also known commonly as the blue-tailed shinning-skink, the Christmas Island blue-tailed shinning-skink, and the Christmas Island blue-tailed skink, is a species of lizard in the family Scincidae that was once endemic to Christmas Island. The Christmas Island blue-tailed skink was discovered in 1888. It was formerly the most abundant reptile on the island, and occurred in high numbers particularly near the human settlement. However, the Christmas Island blue-tailed skink began to decline sharply outwardly from the human settlement by the early 1990s, which coincided with the introduction of a predatory snake and also followed the introduction of the yellow crazy ant in the mid-1980s. By 2006, the Christmas Island blue-tailed skink was on the endangered animals list, and by 2010 the Christmas Island blue-tailed skink was extinct in the wild. From 2009 to 2010, Parks Australia and Taronga Zoo started a captive breeding program, which has prevented total extinction of the species.
The Christmas Island forest skink, also known as the Christmas Island whiptail skink, is an extinct species of skink formerly endemic to Australia's Christmas Island. As of 2017, it is listed as extinct on the IUCN Red List. The last known forest skink, a captive individual named Gump, died on 31 May 2014.
The Seychelles frog is a species of frog endemic to Mahé, Silhouette and Praslin islands in the Seychelles. It inhabits the floor of damp rainforest at altitudes from 150 m (490 ft) to 991 m (3,251 ft) above sea level. Higher altitude sites are considered to be more climatically stable and more suitable. The species is present in Morne Seychellois National Park, Silhouette National Park and Praslin National Park.
The Gau iguana is a species of iguana endemic to Gau Island in the Fijian archipelago. It mostly lives in the well-preserved upland forests of the island, with smaller populations in the degraded coastal forests. It can be distinguished from other South Pacific iguanas by the male's distinctive color pattern and solid green throat. It is also the smallest of all South Pacific iguanas, being about 13% smaller than the third smallest species and 40% smaller than the largest extant species.
The wildlife of Christmas Island is composed of the flora and fauna of this isolated island in the tropical Indian Ocean. Christmas Island is the summit plateau of an underwater volcano. It is mostly clad in tropical rainforest and has karst, cliffs, wetlands, coasts and sea. It is a small island with a land area of 135 km2 (52 sq mi), 63% of which has been declared a National park. Most of the rainforest remains intact and supports a large range of endemic species of animals and plants.