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Ecoregions of Madagascar : ウィキペディア英語版 | Ecoregions of Madagascar
Madagascar, located in the Indian Ocean off the east coast of Africa, is the fourth largest island in the world. Its long isolation from neighbouring continents allowed the evolution of distinct communities of plants and animals. It is home to five percent of the world's plant and animal species, 80 percent of which are endemic to Madagascar. Some biogeographers refer to the island as the "eighth continent", in recognition of its uniqueness and diversity. == Overview ==
Madagascar and neighboring Indian Ocean islands form a distinctive sub-region of the Afrotropic ecozone in biogeography, which botanist Armen Takhtajan called the Madagascan Region. In phytogeography it is the floristic phytochorion Madagascan Subkingdom in the Paleotropical Kingdom. The region is chara north-south along the spine of the island. The Eastern region also includes humid pockets further westward, including Sambirano and Isalo. The ''Flore sous le vent'' (leeward flora), now called the ''Région de l'Ouest'' (Western Region), lies in the rain shadow of the central highlands. It includes the drier western and southern portions of the Island, as well as the island's northern tip. The Eastern and Western regions can be further subdivided into seven terrestrial ecoregions. The Eastern region includes two tropical moist broadleaf forest ecoregions, the Madagascar lowland forests along the eastern coastal strip, and the Madagascar subhumid forests which occupies the highlands above 600–800 meters elevation. At the highest elevations, above 2000 meters, the subhumid forests transition to the Madagascar ericoid thickets, a montane grasslands and shrublands ecoregion. The Madagascar dry deciduous forests, in the tropical southwest, and the drier Madagascar spiny thickets occupies the southernmost region of the island.
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