Tropical and subtropical grasslands, savannas, and shrublands

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Extent of tropical and subtropical grasslands, savannas, and shrublands

Tropical and subtropical grasslands, savannas, and shrublands is a terrestrial biome defined by the World Wide Fund for Nature. [1] The biome is dominated by grass and/or shrubs located in semi-arid to semi-humid climate regions of subtropical and tropical latitudes.

Contents

Description

Grassland is dominated by grass and other herbaceous plants. Savanna is grassland with scattered trees. Shrubland is dominated by woody or herbaceous shrubs.

Large expanses of land in the tropics do not receive enough rainfall to support extensive tree cover. The tropical and subtropical grasslands, savannas, and shrublands are characterized by rainfall levels between 90–150 centimetres (35–59 in) per year. [1] Rainfall can be highly seasonal, with the entire year's rainfall sometimes occurring within a couple of weeks.

African savannas occur between forest or woodland regions and grassland regions. Fa includes acacia and baobab trees, grass, and low shrubs. Acacia trees lose their leaves in the dry season to conserve moisture, while the baobab stores water in its trunk for the dry season. Many of these savannas are in Africa.

Large mammals that have evolved to take advantage of the ample forage typify the biodiversity associated with these habitats. These large mammal faunas are richest in African savannas and grasslands. The most intact assemblages currently occur in East African Acacia savannas and Zambezian savannas consisting of mosaics of miombo, mopane, and other habitats. [2] Large-scale migration of tropical savanna herbivores, such as wildebeest ( Connochaetes taurinus ) and zebra ( Equus quagga ), are continuing to decline through habitat alteration and hunting. [1] They now only occur to any significant degree in East Africa and the central Zambezian region. Much of the extraordinary abundance of Guinean and Sahelian savannas has been eliminated, although the large-scale migrations of Ugandan Kob still occur in the savannas in the Sudd region. [1] The Sudan type of climate is characterized by an alternating hot and rainy season, and a cool and dry season. In the Northern Hemisphere, the hot rainy season normally begins in May and lasts until September. Rainfall varies from 25 cm to 150 cm and is usually unreliable. The rest of the year is cool and dry. Rainfall decreases as one goes either towards North in Northern Hemisphere or South in the Southern Hemisphere. Drought is very common.

Occurrence

Tropical and subtropical grasslands, savannas, and shrublands occur on all continents but Antarctica. They are widespread in Africa, and are also found all throughout South Asia and Southeast Asia, the northern parts of South America and Australia, and the southern United States.

Ecoregions

Angolan miombo woodlands Angola
Angolan mopane woodlands Angola, Namibia
Ascension scrub and grasslands Ascension Island
Central Zambezian miombo woodlands Angola, Burundi, Democratic Republic of the Congo, Malawi, Tanzania, Zambia
East Sudanian savanna Cameroon, Central African Republic, Chad, Democratic Republic of the Congo, Eritrea, Ethiopia, South Sudan, Sudan, Uganda
Eastern miombo woodlands Mozambique, Tanzania
Guinean forest–savanna mosaic Benin, Burkina Faso, Cameroon, Gambia, Ghana, Guinea, Guinea Bissau, Ivory Coast, Nigeria, Senegal, Togo
Itigi–Sumbu thicket Tanzania, Zambia
Kalahari Acacia-Baikiaea woodlands Botswana, Namibia, South Africa, Zimbabwe
Mandara Plateau mosaic Cameroon, Nigeria
Northern Acacia–Commiphora bushlands and thickets Ethiopia, Kenya, South Sudan, Uganda
Northern Congolian forest–savanna mosaic Cameroon, Central African Republic, Democratic Republic of the Congo, South Sudan, Uganda
Sahelian Acacia savanna Burkina Faso, Cameroon, Chad, Eritrea, Ethiopia, Mali, Mauritania, Niger, Nigeria, Senegal, South Sudan, Sudan
Serengeti volcanic grasslands Kenya, Tanzania
Somali Acacia–Commiphora bushlands and thickets Eritrea, Ethiopia, Kenya, Somalia
South Arabian fog woodlands, shrublands, and dune Oman, Saudi Arabia, Yemen
Southern Acacia–Commiphora bushlands and thickets Kenya, Tanzania
Southern Africa bushveld Botswana, South Africa, Zimbabwe
Southern Congolian forest–savanna mosaic Angola, Democratic Republic of the Congo
Southern miombo woodlands Malawi, Mozambique, Zambia, Zimbabwe
Saint Helena scrub and woodlands Saint Helena
Victoria Basin forest–savanna mosaic Burundi, Democratic Republic of the Congo, Ethiopia, Kenya, Rwanda, South Sudan, Tanzania, Uganda
West Sudanian savanna Benin, Burkina Faso, Gambia, Ghana, Guinea,Mali, Ivory Coast, Niger, Nigeria, Senegal
Western Congolian forest–savanna mosaic Angola, Democratic Republic of the Congo, Republic of the Congo
Western Zambezian grasslands Angola, Zambia
Zambezian and mopane woodlands Botswana, eSwatini (Swaziland), Malawi, Mozambique, Namibia, South Africa, Zambia, Zimbabwe
Zambezian Baikiaea woodlands Angola, Botswana, Namibia, Zambia, Zimbabwe
Arnhem Land tropical savanna Australia
Brigalow tropical savanna Australia
Cape York Peninsula tropical savanna Australia
Carpentaria tropical savanna Australia
Einasleigh Uplands savanna Australia
Kimberley tropical savanna Australia
Mitchell grass downs Australia
Trans-Fly savanna and grasslands Indonesia, Papua New Guinea
Victoria Plains tropical savanna Australia
Terai–Duar savanna and grasslands Bhutan, India, Nepal
Western Gulf coastal grasslands Mexico, United States
Beni savanna Bolivia
Campos rupestres Brazil
Cerrado Bolivia, Brazil, Paraguay
Clipperton Island shrub and grasslandsClipperton Island is an overseas territory of France
Córdoba montane savanna Argentina
Guianan savanna Brazil, Guyana, Venezuela
Gran Chaco Argentina, Brazil, Paraguay, Bolivia
Llanos Venezuela, Colombia
Uruguayan savanna Argentina, Brazil, Uruguay
Hawaiian tropical high shrublands Hawaiʻi
Hawaiian tropical low shrublands Hawaiʻi
Northwestern Hawaii scrub Hawaiʻi, Midway Atoll

See also

Related Research Articles

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Steppe Ecoregion of plain grasslands without trees

In physical geography, a steppe is an ecoregion characterized by grassland plains without trees apart from those near rivers and lakes.

Temperate grasslands, savannas, and shrublands Terrestrial biome

Temperate grasslands, savannas, and shrublands is a terrestrial biome defined by the World Wide Fund for Nature. The predominant vegetation in this biome consists of grass and/or shrubs. The climate is temperate and ranges from semi-arid to semi-humid. The habitat type differs from tropical grasslands in the annual temperature regime as well as the types of species found here.

Sclerophyll Type of plant

Sclerophyll is a type of vegetation that is adapted to long periods of dryness and heat. The plants feature hard leaves, short internodes and leaf orientation which is parallel or oblique to direct sunlight. The word comes from the Greek sklēros (hard) and phyllon (leaf). The term was coined by A.F.W. Schimper in 1898, originally as a synonym of xeromorph, but the two words were later differentiated.

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Savanna Mixed woodland-grassland ecosystem

A savanna or savannah is a mixed woodland-grassland ecosystem characterised by the trees being sufficiently widely spaced so that the canopy does not close. The open canopy allows sufficient light to reach the ground to support an unbroken herbaceous layer consisting primarily of grasses.

Tropical climate One of the five major climate groups in the Köppen climate classification

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Miombo

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Llanos Grassland

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Wildlife of Burkina Faso Flora and fauna of the landlocked west African country

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Victoria Plains tropical savanna

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Zambezian and mopane woodlands Tropical and subtropical grasslands, savannas, and shrublands ecoregion of southeastern Africa.

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Tropical vegetation Vegetation in tropical latitudes

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Mahango Game Park

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West Sudanian savanna

The West Sudanian savanna is a tropical savanna ecoregion that extends across West Africa.

Southern <i>Acacia</i>–<i>Commiphora</i> bushlands and thickets

The Southern AcaciaCommiphora bushlands and thickets is a tropical grasslands, savannas, and shrublands ecoregion in Tanzania and Kenya. It includes portions of Serengeti National Park and Ngorongoro Conservation Area, which are designated World Heritage Sites and biosphere reserves for their outstanding wildlife and landscapes. It is one of three Acacia–Commiphora bushlands and thickets ecoregions in eastern Africa.

References

  1. 1 2 3 4 CC-BY-SA-icon-80x15.png  This article incorporates text available under the CC BY-SA 3.0 license.World Wide Fund for Nature. "Tropical and Subtropical Grasslands, Savannas and Shrubland Ecoregions". Archived from the original on 2012-04-25. Retrieved 2019-05-29.
  2. McClanahan, TR; Young, TP, eds. (1996). East African ecosystems and their conservation. New York: Oxford University Press.