Atoll

Definition of atoll is a ringlike coral island and reef that nearly or entirely encloses a lagoon.

Maldives is one country made up of many atolls.

Are there any other countries that is made up of atolls ???

Ada sesiapa yg ada lagi info pasal atoll silakan.......

Remy_3D

Johnston Atoll
Palmyra Atoll
Wake Island

Kepulauan nie amat penting, walaupun nama mereka amat jarang didengari hehe

Originally posted by Remy_3D at 30-5-2004 02:32 PM:
Johnston Atoll
Palmyra Atoll
Wake Island

Kepulauan nie amat penting, walaupun nama mereka amat jarang didengari hehe

Kat mana tempat2 tu , Remy ???

Yg I selalu dengar ialah Maldives......

Remy_3D

Oceania, lah pulau nie mana ada orang tinggal, sebab tu tak glamer....

Johnston Atoll is a small ancient atoll (80 million years old) and is perhaps the most isolated reef in the world, being 800 kilometers southwest of Hawaii, its nearest island neighbor, and 1,500 kilometers north and east of the Northern Line Islands and the Phoenix Islands, respectively. These reefs are important for biodiversity, serving as a biological stepping stone between Hawaii and the island groups to the south and west. The 30 species of coral have close affinities to the coral biota of Hawaii, and corals, reef fishes, seabirds, and green turtles flourish on the reefs and islands of the atoll. The atoll is a national wildlife refuge, jointly administered by the U.S. Fish and Wildlife Service and the U.S. Department of Defense -

Johnston Atoll, located 717 nautical miles southwest of Honolulu, Hawaii, is operated and maintained by Field Command, Defense Special Weapons Agency  (DSWA), Kirtland Air Force Base, New Mexico. The atoll consists of four coral islands: Johnston Island, Sand Island, North Island, and East Island. At just over 625 acres, Johnston Island is the largest island and the base for all operations and management activities, including all personnel and community support functions. There are about 960 civilian and 250 military personnel assigned to the island. The Johnston Atoll mission is to support the U.S. Army chemical weapon storage and destruction program.

Johnston Atoll is a military installment on a 1 square mile circle of coral in the Central Pacific Ocean. Population stands at 327, and consists entirely of military personnel. There are no auto number plates in existence, and to date, no metal bicycle plates have surfaced, but there is known to exist at least one bike license sticker, with the island name fully spelled out.

mbhcsf

so am i wrong if i were presuming  that all these islands can be found in Pacific oceans?

how about Maldives island?

mbhcsf

sapa boleh refreshen my mind about the theory of atoll formation....???

ade kan Darwin bagi  idea sikit???

alphawolf

Tak ingat le teori....tapi ada something to do with erosion. Anyway atoll banyak terdapat di perairan tropika yang sesuai utk pertumbuhan karang. Sebab tu mana ada atoll dekat Atlantik...Negara yang terdiri dari atoll ni kebnaykannya di PAsifik macam yang dinyatakan di atas. Selain tu Kepulauan Carolines, Kepulauan Gilbert dan kepulauan Marshalls kebayakannya adalah atoll....sayangnya sehingga dari tahun 1946-1960an kebanyakan pulau ini dijadikan tapak ujian senjata nuklear US macam di Bikini Atoll, Kwajalein Atoll dan Eniwetok Atoll. Kepulauan Maldives terletak di Lautan Hindi.

Atoll, ring-shaped coral island or several smaller islands as part of a coral reef surrounding a central lagoon. There are some 400 atolls in the world, most of which are in the western and central parts of the Pacific Ocean. The largest is Kwajalein in the Marshall Islands (120 km long).

The 19th-century naturalist Charles Darwin first proposed the theory of atoll formation. After a volcano erupts on the ocean floor, the lava emissions form new layers on the volcano抯 outer surface, creating a conical mountain that becomes visible above the water抯 surface as an island. Next, coral begins to grow in the shallow waters surrounding the volcanic island, eventually forming a coral reef. Over time, the volcano ceases to erupt and it begins to erode and subside; sea water then floods the space between it and the surrounding reef. Eventually, the volcano may collapse under its own weight, erode below the surface of the ocean, or be covered by a rise in sea level. Sea water fills the area where the crater of the volcano once stood, eventually forming an atoll.

Wake Island, formerly Halcyon Island, coral atoll, territory of the United States, central Pacific Ocean. It is a group of three islets (Wake, Peale, and Wilkes) that enclose a shallow lagoon, and totalling 8 sq km ( 3 sq mi) in area. First sighted by Spanish explorers in 1568, the island was visited by the British in 1796. Wake Island was formally occupied by the United States in 1898. In 1934 it was placed under the jurisdiction of the US Department of the Navy, and in 1935 a commercial air base was established on the atoll to serve planes on flights between the United States and the Orient. Construction of a naval air base and a submarine base on Wake Island was begun in 1939.

On December 7, 1941, during World War II, immediately after the Japanese attack on Pearl Harbor, Japanese air and naval forces attacked Wake Island. After a heroic defence against overwhelming odds, the small garrison surrendered on December 23, and it remained under Japanese occupation until the end of the war. The island is administered by the US Air Force. The population (1990) is 7.

:clap::clap::clap::clap::clap:

French Polynesia is divided into five archipelagos:
1. the Society Islands, composed of the Windward Islands and the Leeward Islands;
2. the Tuamotu Archipelago;
3. the Gambier Islands;
4. the Austral Islands;
5. the Marquesas Islands.

Clipperton Island, an uninhabited atoll south of the coast of Mexico, is also part of the territory. The Tuamotu Archipelago consists entirely of coral atolls and accounts for more than half of the territory抯 islands.

kulit

sooo thatss what Atoll means good info...




this is how it is form

an example of an uninhabited atoll ..eh ni island apa yek? aku cari image je..hehe


inhabited atoll must have some land/forests on it like these..palmyra atoll,US



no wonder some population of atoll is only 7!! maybe more of a birds sanctuary..and not the forgetting beautiful reefs..major concern is the rising sea level cause by global warming which can tenggelam these islands consequently becoming another reef..ive read on websites when the islands are inhabited with human settlement some atolls are becoming into airports,weapon testings,military occupation,mines(!!) and plantations..they just couldnt leave the islands as natural reserves...manusia kalau nampak benda cantik nak destroy jek dah tak cukup land kot kat dunia ni..

Johnston Island bird haven..these are Terns

Black Noddy in Midway atoll


[ Last edited by kulit on 4-6-2004 at 10:34 AM ]

nevberg

antara taburan atoll di maldives....




secara geografinya...memang maldives ni coral island atoll

Land Area
1,190 islands with a land area of 115 square miles (298 sq. km)

[ Last edited by nevberg on 4-6-2004 at 11:57 AM ]

nevberg

aldabra atoll dilindungi oleh UNESCO. atoll ni kat seychelles

aldabra atoll



ni gambar satelit.

Johnston Atoll

Pocahontas

Aldabra is one of the world's largest coral atolls, stretching 22km (14mi) east to west and enclosing a huge tidal lagoon, which is sometimes home to tiger sharks and manta rays. Aldabra is the original habitat of the giant land tortoise, and there are about 200,000 of them on the atoll, as well as thousands of seabirds, including the white-throated rail, the sole remaining species of flightless bird in the Indian Ocean.

Assomption Island, 27km (17mi) south of Aldabra, was once a rich source of guano, but the harvesters who exploited the island also stripped it of vegetation, so that by the 1920s no plants, animals or birds lived here. Underwater, however, it's a different story: Jacques Cousteau filmed most of his documentary, The Silent World, here, and said he'd never seen any other place on earth with same clarity of water or diversity of reef life.

The only people who live on Aldabra are scientists, and they're only here three months of the year. Aldabra is more than 1000km (620mi) from Mahe, and there are no hotels here. If you want to visit Aldabra, you'll have to organise a boat with the Marine Charter Association in Victoria, or fly to Desroches and charter a boat from there.

:pompom: :pompom: :pompom:

mbhcsf

anything on BIODIVERSITY on this  atoll / reef

Originally posted by mbhcsf at 5-6-2004 11:46 AM:
anything on BIODIVERSITY on this  atoll / reef

not sure in detail  but memang ada kena-mengena....

there are some impact of biodiversity on atolls , but to what extend , am not sure....

will try and find out more....

[ Last edited by PeNinGLaLaT on 5-6-2004 at 01:06 PM ]

Impact of Biodiversity on Atolls in Maldives




Coral reefs in the Maldives take the form of patch/platform reefs, pillars, knoll and atoll structures. The importance of the atoll reef type could be summarized as providing protection of coastal areas against wave action, storms, preventing erosion as well as contributing to the formation of the sandy beaches. Together with the Chagos the Maldives has the greatest coral diversity in the central Indian Ocean. Though a detailed biodiversity inventory has yet to be undertaken, it is estimated that there are at least 250 species of scleractinian corals, belonging to 55 genera in the Maldives archipelago. These coral reefs support a large number of fish species, many of which are of economic and recreational importance.

Most environmental concerns and problems in the Maldives relate to practical problems, policy issues and cross-sectoral issues. Though the EIA mechanism established is a fairly comprehensive mechanism to support environmentally sound coastal and marine management, the relevant Ministry (MOHAHE) does not have the full capacity to evaluate and enforce the process. Without this capacity, degradation persists resulting in irreversible loss of biodiversity and pollution in coastal waters.

The major threats to coastal and marine resources include sedimentation from bad coastal practices, sewage, waste dumping, dredging and filling near shore areas.

Traditionally human populations were relatively small and the life cycles of Maldivians had little direct impacts on the environment. This situation has changed rapidly. Since the 1970s the population has risen dramatically, particularly In Male' but also in some of the other atolls.

Given that the Maldives is a small island nation, all activities, including economic activities, take place in the coastal zone. Historically and even now, fishing (pole and line for tuna) is the major source of employment in rural communities. However, with the expansion of tourism there has been a shift to other forms of employment associated with tourism and a diversification of fisheries to include reef based fish and invertebrates.

There is a pleasure in the pathless woods,
There is a rapture on the lonely shore,
There is society, where none intrudes,
By the deep sea, and music in its roar:
I love not man the less, but Nature more.
~George Gordon, Lord Byron, Childe Harold's Pilgrimage

[ Last edited by PeNinGLaLaT on 5-6-2004 at 09:21 PM ]

mbhcsf

Originally posted by PeNinGLaLaT at 2004-6-5 13:04:



not sure in detail  but memang ada kena-mengena....

there are some impact of biodiversity on atolls , but to what extend , am not sure....

will try and find out more....[ ...

good kita nak tahu apa potential yg ada pada marines lives ni