Madagascar ericoid thickets | |
---|---|
Ecology | |
Realm | Afrotropical |
Biome | Montane shrubland |
Borders | Madagascar subhumid forests |
Geography | |
Area | 1,295 km2 (500 sq mi) |
Country | Madagascar |
Elevation | 1,800–2,900 metres (5,900–9,500 ft) |
Coordinates | 19°25′S47°12′E / 19.417°S 47.200°E Coordinates: 19°25′S47°12′E / 19.417°S 47.200°E |
Geology | metamorphic and igneous basement rocks |
Climate type | Subtropical highland (Cwb) |
Soil types | thin, nutrient-poor |
Conservation | |
Conservation status | critical/endangered |
Global 200 | not included |
Protected | 32.1% [1] |
The Madagascar ericoid thickets is a montane shrubland ecoregion, found at higher altitudes on Madagascar's four major mountains.
The ecoregion covers the area above 1800 m elevation on (from north to south) Tsaratanana (2,876 m), Marojejy (2,133 m), Ankaratra (2,643 m), and Andringitra Massif (2,658 m). The ericoid thickets are surrounded at lower elevations by the Madagascar subhumid forests ecoregion. The total area of the ecoregion is 1,300 km2 (500 sq mi). On Tsaratanana the thickets are higher up, starting above 2,500m. There are smaller areas of thicket in Anjanaharibe-Sud Reserve in the north and Andohahela National Park to the south. [2]
The ericoid thickets are characterised by shrubs of the flowering plant families Asteraceae, Ericaceae, Podocarpaceae, Rhamnaceae and Rubiaceae. They include a large number of endemic plants, many of whose closest relatives live in South Africa and the highlands of East Africa. Andringitra alone is home to 150 vascular endemics, including 25 species of orchid. [2]
These high points of Madagascar are home to less diverse animal life than on the lower slopes, but with a high proportion of endemics. The area was not thoroughly researched until the 1990s. There are at least ten species of endemic and near-endemic reptiles including the dwarf gecko Lygodactylus arnoulti . [2]
The highlands are vulnerable to fire and to conversion to cattle pasture, although Tsaratanana, Andringitra and Marojejy are all protected areas. [2]
32.1% of the ecoregion is in protected areas. Protected areas include Marojejy National Park, Tsaratanana Strict Nature Reserve, Andringitra National Park, and Rainforests of the Atsinanana World Heritage Site. [1]
The Eastern Highlands, also known as the Manica Highlands, is a mountain range on the border of Zimbabwe and Mozambique. The Eastern Highlands extend north and south for about 300 kilometres (190 mi) through Zimbabwe's Manicaland Province and Mozambique's Manica Province.
The Madagascar lowland forests or Madagascar humid forests are a tropical moist broadleaf forest ecoregion found on the eastern coast of the island of Madagascar, home to a plant and animal mix that is 80 to 90% endemic, with the forests of the eastern plain being a particularly important location of this endemism. They are included in the Global 200 list of outstanding ecoregions.
The Madagascar subhumid forests are a tropical moist broadleaf forest ecoregion that covers most of the Central Highlands of the island of Madagascar. They are included in the WWF's Global 200 list of outstanding ecoregions. Most of the original habitats have been lost due to human pressure.
The Maputaland-Pondoland bushland and thickets is one of the ecoregions of South Africa. It consists of the montane shrubland biome.
The Madagascar spiny forests is an ecoregion in the southwest of Madagascar. The vegetation type is found on poor substrates with low, erratic winter rainfall. The ecoregion contains an outstanding proportion of endemic plant species and is listed as one of the 200 most important ecological regions in the world; one of the Global 200.
The Madagascar dry deciduous forests represent a tropical dry forest ecoregion situated in the western and northern part of Madagascar. The area has high numbers of endemic plant and animal species but has suffered large-scale clearance for agriculture. They are among the world's richest and most distinctive dry forests and included in the Global 200 ecoregions by the World Wide Fund. The area is also home to distinctive limestone karst formations known as tsingy, including the World Heritage Site of Bemaraha.
The Northern Congolian forest–savanna mosaic is a forest and savanna ecoregion of central Africa. It extends east and west across central Africa, covering parts of Cameroon, Central African Republic, Democratic Republic of the Congo, South Sudan, and Uganda. It is part of the belt of transitional forest-savanna mosaic that lie between Africa's moist equatorial Guineo-Congolian forests and the tropical dry forests, savannas, and grasslands to the north and south.
The Mount Cameroon and Bioko montane forests is a tropical moist broadleaf forest ecoregion in central Africa. It occupies the upper slopes of coastal Mount Cameroon in Cameroon, and the mountains of nearby Bioko island in Equatorial Guinea.
The Mediterranean Acacia-Argania dry woodlands and succulent thickets is a Mediterranean forests, woodlands, and scrub ecoregion in North Africa centered mainly on Morocco but also including northwestern Western Sahara and the eastern Canary Islands.
For other localities with the same name, see Tsaratanana (disambiguation)
The Southern Zanzibar-Inhambane coastal forest mosaic, also known as the Southern Swahili coastal forests and woodlands, is a tropical moist broadleaf forest ecoregion of eastern Africa. It is a southern variation of Northern Zanzibar-Inhambane coastal forest mosaic. The ecoregion supports habitats of forest, savanna and swamps. The southern portion of the ecoregion is not as well studied due to the 1977-1992 civil war in Mozambique.
The Ethiopian montane moorlands is a montane grasslands and shrublands ecoregion in Ethiopia. It lies above 3,000 meters elevation in the Ethiopian Highlands, the largest Afroalpine region in Africa. The montane moorlands lie above the tree line, and consist of grassland and moorland with abundant herbs and shrubs adapted to the high elevation conditions.
The East African montane forests is a montane tropical moist forest ecoregion of eastern Africa. The ecoregion comprises several separate areas above 2000 meters in the mountains of South Sudan, Uganda, Kenya, and Tanzania.
The East African montane moorlands is a montane grasslands and shrublands ecoregion which occupies several high mountain peaks in Kenya, South Sudan, Tanzania, and Uganda.
The Ruwenzori-Virunga montane moorlands is a montane grasslands and shrublands ecoregion of the Rwenzori Mountains and Virunga Mountains in central Africa.
The Ethiopian montane forests is a tropical moist broadleaf forest ecoregion in eastern Africa. It covers the middle elevations of the Ethiopian Highlands in Ethiopia and extends into neighboring Eritrea, Sudan, Djibouti, and Somaliland. The ecoregion includes distinctive Afromontane forests, woodlands, grasslands, and shrublands. The ecoregion's biodiversity is threatened by deforestation, conversion to agriculture, and overgrazing.
The southern Congolian forest–savanna mosaic is an ecoregion that covers a large area of the southern Democratic Republic of the Congo and northeastern Angola. Its rich blend of habitats provides key insights into the biogeography of central Africa with the extensive climatic variation that it has been experiencing for the last 10 million years. The human population is not high.
The Madagascar succulent woodlands are a xeric shrublands ecoregion in southwestern and central western Madagascar. They are threatened by various human activities.
The Somali Acacia–Commiphora bushlands and thickets is a semi-arid tropical grasslands, savannas, and shrublands ecoregion in the Horn of Africa. It is home to diverse communities of plants and animals, including several endemic species.
The Victoria Basin forest–grassland mosaic is an ecoregion that lies mostly in Uganda and extends into neighboring countries. The ecoregion is centered north and west of Lake Victoria, with an outlier on the border of Ethiopia and South Sudan.