Eastern Micronesia tropical moist forests

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Eastern Micronesia tropical moist forests
Onotoa.png
Onotoa atoll in the Gilbert Islands
Ecoregion OC0104.png
Map of the Eastern Micronesia tropical moist forests ecoregion
Ecology
Realm Oceanian
Biome tropical and subtropical moist broadleaf forests
Geography
Area534 km2 (206 sq mi)
Countries Kiribati, Marshall Islands, Nauru and United States
Conservation
Conservation status Critical/endangered [1]
Global 200 South Pacific Islands forests
Protected8.2% [2]

The Eastern Micronesia tropical moist forests is a tropical and subtropical moist broadleaf forests ecoregion in Micronesia. It includes the Marshall Islands, Banaba and the Gilbert Islands in Kiribati, Nauru, and Wake Island, a possession of the United States.

Contents

Geography

The islands are mostly atolls, low islands of coralline sand ringing a central lagoon, or raised platforms of coralline limestone. [1]

There are 30 atolls in the Marshall Islands, made up of more than 1000 islands. They form two parallel island chains that run southwest to northeast, extending 1,300 km from east to west and 1,150 km north to south. The western Ralik, or "sunset" chain extends from Eniwetok to Ebon, and the eastern Ratak or "sunrise" chain from Taongi and Rongelap to Mili.

The Gilbert Islands lie southeast of the Marshall Islands, and include 16 atolls and coral islands.

Nauru and Banaba are low islands composed of uplifted coralline limestone lying west of the Gilbert Islands. Nauru is an independent country, and Banaba is part of Kiribati.

Wake Island is an isolated atoll north of the Marshall Islands.

Climate

The climate of the islands is tropical, with little seasonal temperature variation.

The central part of the ecoregion lies in the trade wind belt, and receives the highest rainfall, up to 3000 mm annually. The northern islands, including the northern Marshalls and Wake island, are drier, as are the southern Gilberts. May through November are generally the wettest months. The Marshalls experience typhoons. [1]

Flora

The predominant vegetation on wetter islands is tropical moist forest. Forests nearer the shore are of short to medium stature, with the trees Heliotropium foertherianum, Guettarda speciosa, Pisonia grandis, Pandanus tectorius, Allophylus timorensis, Cordia subcordata, Hernandia nymphaeifolia , and Thespesia populnea . In the island interiors, mature forests of Ochrosia oppositifolia can grow in pure stands on the more humid islands. Pisonia grandis also occurs in monospecific stands, and can grow up to 30 meters tall with trunks more than two meters in diameter. The mature Ochrosia and Pisonia forests form a dense canopy, and little grows in the shady understory. [1]

On drier islands and in areas exposed to salt spray, vegetation includes low grasses and beach creepers, coastal scrub, and low-canopied mixed forests. [1]

The flora is mostly of widespread coastal Indo-Pacific species, with relatively few endemic species. [1]

Fauna

Native vertebrates are chiefly seabirds, which form large colonies on many islands. The Insular flying fox (Pteropus tonganus) and Pacific sheath-tailed bat (Emballonura semicaudata) are the only native non-marine mammals.

The Nauru reed warbler (Acrocephalus rehsei) is endemic to Nauru. [1]

Protected areas

8.2% of the ecoregion is in protected areas. [2]

Related Research Articles

Geography of Kiribati

Kiribati consists of 32 atolls and one island scattered over all four hemispheres in an expanse of ocean equivalent in size to the continental United States. The islands lie roughly halfway between Hawaii and Australia in the Micronesian and Polynesian regions of the South Pacific. The three main island groupings are the Gilbert Islands, Phoenix Islands, and Line Islands. On 1 January 1995 Kiribati moved the International Date Line to include its easternmost islands and make it the same day throughout the country.

Geography of the Marshall Islands

The Marshall Islands consist of two archipelagic island chains of 30 atolls and 1,152 islands, which form two parallel groups—the "Ratak" (sunrise) chain and the "Ralik" (sunset) chain. The Marshalls are located in the North Pacific Ocean and share maritime boundaries with Micronesia and Kiribati. Two-thirds of the nation's population lives in the capital of Majuro and the settlement of Ebeye. The outer islands are sparsely populated due to lack of employment opportunities and economic development.

Micronesia Subregion of Oceania

Micronesia is a subregion of Oceania, composed of thousands of small islands in the western Pacific Ocean. It has a close shared cultural history with three other island regions: the Philippines to the west, Polynesia to the east, and Melanesia to the south; as well as with the wider Austronesian peoples.

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Tongan tropical moist forests

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Cook Islands tropical moist forests

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Tubuai tropical moist forests

The Tubuai tropical moist forests is a tropical and subtropical moist broadleaf forests ecoregion in French Polynesia. It covers the Austral Islands.

Society Islands tropical moist forests

The Society Islands tropical moist forests is a tropical and subtropical moist broadleaf forests ecoregion in the Society Islands of French Polynesia.

Marquesas tropical moist forests

The Marquesas tropical moist forests is a tropical and subtropical moist broadleaf forests ecoregion in the Marquesas Islands of French Polynesia.

Tuamotu tropical moist forests

The Tuamotu tropical moist forests is a tropical and subtropical moist broadleaf forests ecoregion in the Tuamotu Archipelago of French Polynesia and the Pitcairn Islands.

Central Polynesian tropical moist forests

The Central Polynesian tropical moist forests is a tropical and subtropical moist broadleaf forests ecoregion in Polynesia. It includes the northern Cook Islands, the Line Islands in Kiribati, and Johnston Atoll, Jarvis Island, Palmyra Atoll, and Kingman Reef which are possessions of the United States.

Western Polynesian tropical moist forests

The Western Polynesian tropical moist forests is a tropical and subtropical moist broadleaf forests ecoregion in Polynesia. It includes Tuvalu, the Phoenix Islands in Kiribati, Tokelau, and Howland and Baker islands, which are possessions of the United States.

Palau tropical moist forests

The Palau tropical moist forests is a tropical and subtropical moist broadleaf forests ecoregion in Micronesia. It encompasses the nation of Palau.

Marianas tropical dry forests

The Marianas tropical dry forests is a tropical and subtropical dry broadleaf forests ecoregion on the Marianas Islands in the western Pacific Ocean.

Carolines tropical moist forests

The Carolines tropical moist forests is a tropical and subtropical moist broadleaf forests ecoregion in Micronesia. It includes the central and eastern Caroline Islands in the Federated States of Micronesia.

Yap tropical dry forests

The Yap tropical dry forests is a tropical and subtropical dry broadleaf forests ecoregion in Micronesia. It includes the Yap Islands and neighboring atolls in the Federated States of Micronesia.

Northwestern Hawaii scrub

The Northwestern Hawaii scrub is a tropical and subtropical grasslands, savannas, and shrublands ecoregion on the Northwestern Hawaiian Islands in the Pacific Ocean.

References

  1. 1 2 3 4 5 6 7 "Eastern Micronesia tropical moist forests". Terrestrial Ecoregions. World Wildlife Fund.
  2. 1 2 "Eastern Micronesia tropical moist forests". DOPA Explorer. Retrieved 2020-11-27.