New Guinea New Guinea (; Hiri Motu: ''Niu Gini''; , fossilized , also known as Papua or historically ) is the List of islands by area, world's second-largest island, with an area of . Located in Melanesia in the southwestern Pacific Ocean, the island is ...

, lying within the

tropics The tropics are the regions of Earth surrounding the equator, where the sun may shine directly overhead. This contrasts with the temperate or polar regions of Earth, where the Sun can never be directly overhead. This is because of Earth's ax ...

and with extensive mountain areas, comprises a wide range of

ecoregion An ecoregion (ecological region) is an ecological and geographic area that exists on multiple different levels, defined by type, quality, and quantity of environmental resources. Ecoregions cover relatively large areas of land or water, and c ...

s. These include

rainforest Rainforests are forests characterized by a closed and continuous tree Canopy (biology), canopy, moisture-dependent vegetation, the presence of epiphytes and lianas and the absence of wildfire. Rainforests can be generally classified as tropi ...

grassland A grassland is an area where the vegetation is dominance (ecology), dominated by grasses (Poaceae). However, sedge (Cyperaceae) and rush (Juncaceae) can also be found along with variable proportions of legumes such as clover, and other Herbaceo ...

s and

mangrove A mangrove is a shrub or tree that grows mainly in coastal saline water, saline or brackish water. Mangroves grow in an equatorial climate, typically along coastlines and tidal rivers. They have particular adaptations to take in extra oxygen a ...

Terrestrial ecoregions

New Guinea is in the

Australasian realm The Australasian realm is one of eight biogeographic realms that is coincident with, but not (by some definitions) the same as, the geographical region of Australasia. The realm includes Australia, the island of New Guinea (comprising Papua Ne ...

, which also includes the islands of

Wallacea Wallacea is a biogeography, biogeographical designation for a group of mainly list of islands of Indonesia, Indonesian islands separated by deep-water straits from the Asian and Australia (continent), Australian continental shelf, continental ...

to the west, the Bismarck Archipelago, Solomon Islands, and Vanuatu to the east, and Australia and New Zealand. Sea levels were lower during the

Ice Ages An ice age is a long period of reduction in the temperature of Earth's surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers. Earth's climate alternates between ice ages, and Gre ...

, which exposed the shallow continental shelf and connected New Guinea to Australia into a single land mass. Several nearby islands, including the Aru Islands, most of the

Raja Ampat Islands Raja Ampat (), or the Four Kings, is an archipelago located off of the northwest tip of Bird's Head Peninsula (on the island of New Guinea), Southwest Papua , Southwest Papua province, Indonesia. It comprises over 1,500 small islands, cays, and sh ...

, and

Yapen Yapen (also Japen, Jobi) is an island of Papua (province), Papua, Indonesia. The Yapen Strait separates Yapen and the Biak Islands to the north. It is in Cenderawasih Bay off the north-western coast of the island of New Guinea. To the west is ...

, were also connected to the mainland, which allowed the flora and fauna of New Guinea and the continental shelf islands to mix.

Tropical and subtropical moist broadleaf forests

* Central Range montane rain forests *

Huon Peninsula montane rain forests The Huon Peninsula montane rain forests is a tropical and subtropical moist broadleaf forests, tropical moist forest ecoregion in New Guinea. The ecoregion covers the mountains of northeastern New Guinea's Huon Peninsula. Geography The ecoregion ...

* Northern New Guinea lowland rain and freshwater swamp forests *

Northern New Guinea montane rain forests The Northern New Guinea montane rain forests is a tropical moist forest ecoregion in northern New Guinea. The ecoregion covers several separate mountain ranges lying north of New Guinea's Central Range and south of the Pacific Ocean. Geogra ...

* Southeastern Papuan rain forests * Southern New Guinea freshwater swamp forests * Southern New Guinea lowland rain forests * Vogelkop–Aru lowland rain forests * Vogelkop montane rain forests

Tropical and subtropical grasslands, savannas, and shrublands

* Trans-Fly savanna and grasslands

Montane grasslands and shrublands

* Central Range sub-alpine grasslands

Mangrove

* New Guinea mangroves

Freshwater ecoregions

* Vogelkop–Bomberai * New Guinea North Coast * New Guinea Central Mountains * Southwest New Guinea - Trans-Fly Lowland *

Papuan Peninsula The Papuan Peninsula, also known as the Bird's Tail Peninsula, is a large peninsula in Papua New Guinea, southeast of the city of Lae, that makes up the southeastern portion of the island of New Guinea. The peninsula is the easternmost extent of ...

Marine ecoregions

The oceans around New Guinea are part of the

Central Indo-Pacific The Central Indo-Pacific is a biogeographic region of Earth's seas, comprising the tropical waters of the western Pacific Ocean, the eastern Indian Ocean, and the connecting seas. The Central Indo-Pacific is a part of the larger Indo-Pacific, w ...

marine realm. The realm is divided into marine provinces, which are further divided into marine ecoregions.Mark D. Spalding, Helen E. Fox, Gerald R. Allen, Nick Davidson, Zach A. Ferdaña, Max Finlayson, Benjamin S. Halpern, Miguel A. Jorge, Al Lombana, Sara A. Lourie, Kirsten D. Martin, Edmund McManus, Jennifer Molnar, Cheri A. Recchia, James Robertson, Marine Ecoregions of the World: A Bioregionalization of Coastal and Shelf Areas, BioScience, Volume 57, Issue 7, July 2007, Pages 573–583, https://doi.org/10.1641/B570707 * Western

Coral Triangle The Coral Triangle (CT) is a roughly triangular area in the tropical waters around Indonesia, Malaysia, Papua New Guinea, the Philippines, Solomon Islands, and Timor-Leste. This area contains at least 500 species of reef-building corals in each ...

province ** Papua * Eastern

province **

Bismarck Sea The Bismarck Sea (, ) lies in the south-western Pacific Ocean within the Papua New Guinea, Papua New Guinean exclusive economic zone. It is located north-east of the island of New Guinea and south of the Bismarck Archipelago. It has coastlines i ...

** Solomon Sea ** Southeast Papua New Guinea *

Sahul Shelf Geology, Geologically, the Sahul Shelf () is a part of the continental shelf of the Australia (continent), Australian continent, lying off the northwest coast of mainland Australia. Etymology The name "Sahull" or "Sahoel" appeared on 17th c ...

province **

Gulf of Papua The Gulf of Papua is located in the southern coast region of New Guinea. It has a total surface area of . Geography Some of New Guinea's largest rivers, such as the Fly River, Turama River, Kikori River, Purari River, and Wawoi River flow ...

Arafura Sea The Arafura Sea (or Arafuru Sea) lies west of the Pacific Ocean, overlying the continental shelf between Australia and Western New Guinea (also called Papua), which is the Indonesian part of the Island of New Guinea. Geography The Arafura Sea is ...

References

{{reflist * Robin Abell, Michele L. Thieme et al. (2008). "Freshwater Ecoregions of the World: A New Map of Biogeographic Units for Freshwater Biodiversity Conservation". ''BioScience'', Volume 58, Issue 5, May 2008, Pages 403–414, https://doi.org/10.1641/B580507 Natural history of New Guinea *

* * Natural history of Papua New Guinea