The East Saharan montane xeric woodlands is an

ecoregion An ecoregion (ecological region) or ecozone (ecological zone) is an ecologically and geographically defined area that is smaller than a bioregion, which in turn is smaller than a biogeographic realm. Ecoregions cover relatively large areas of ...

of central Africa, a number of high mountains in the middle of the huge area of savanna on the edge of the

Sahara Desert , photo = Sahara real color.jpg , photo_caption = The Sahara taken by Apollo 17 astronauts, 1972 , map = , map_image = , location = , country = , country1 = , ...

Location and description

The ecoregion covers the higher elevations of the

Ennedi Plateau The Ennedi Plateau is located in the northeast of Chad, in the regions of Ennedi-Ouest and Ennedi-Est. It is considered a part of the group of mountains known as the Ennedi Massif found in Chad, which is one of the nine countries that make up ...

and the

Ouaddaï Highlands Ouaddaï Highlands is an area in east of Chad along the border with Sudan. The Ennedi Plateau and the Ouaddaï highlands in the east of Chad complete the image of a gradually sloping basin, which descends towards Lake Chad. There are also central ...

of eastern

Chad Chad (; ar, تشاد , ; french: Tchad, ), officially the Republic of Chad, '; ) is a landlocked country at the crossroads of North and Central Africa. It is bordered by Libya to the north, Sudan to the east, the Central African Republic ...

and the extinct volcano system Jebel Marra in

Darfur Darfur ( ; ar, دار فور, Dār Fūr, lit=Realm of the Fur) is a region of western Sudan. ''Dār'' is an Arabic word meaning "home f – the region was named Dardaju ( ar, دار داجو, Dār Dājū, links=no) while ruled by the Daju ...

, western

Sudan Sudan ( or ; ar, السودان, as-Sūdān, officially the Republic of the Sudan ( ar, جمهورية السودان, link=no, Jumhūriyyat as-Sūdān), is a country in Northeast Africa. It shares borders with the Central African Republic t ...

. These mountain ranges rise above the semi-desert

sahel The Sahel (; ar, ساحل ' , "coast, shore") is a region in North Africa. It is defined as the ecoclimatic and biogeographic realm of transition between the Sahara to the north and the Sudanian savanna to the south. Having a hot semi-arid cli ...

ian

Acacia ''Acacia'', commonly known as the wattles or acacias, is a large genus of shrubs and trees in the subfamily Mimosoideae of the pea family Fabaceae. Initially, it comprised a group of plant species native to Africa and Australasia. The genus nam ...

savanna A savanna or savannah is a mixed woodland- grassland (i.e. grassy woodland) 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 ...

at the southern edge of the

Sahara Desert , photo = Sahara real color.jpg , photo_caption = The Sahara taken by Apollo 17 astronauts, 1972 , map = , map_image = , location = , country = , country1 = , ...

. The ecoregion covers an area of . The summer rains are irregular, even more so in Chad than on Jebel Marra, which has two crater lakes.

Flora

Plant life includes many species typical of the sahel belt including '' Ammania gracilis'', the grass '' Panicum laetum'', the

forb A forb or phorb is an herbaceous flowering plant that is not a graminoid (grass, sedge, or rush). The term is used in biology and in vegetation ecology, especially in relation to grasslands and understory. Typically these are dicots without woo ...

'' Chrozophora brocchiana'' and the herbs '' Farsetia stenoptera'', ''

Indigofera ''Indigofera'' is a large genus of over 750 species of flowering plants belonging to the pea family Fabaceae. They are widely distributed throughout the tropical and subtropical regions of the world. Description Species of ''Indigofera'' are mos ...

senegalensis'' and '' Tephrosia gracilipes''. One classic element of the natural flora was Laperrine's

Olive The olive, botanical name ''Olea europaea'', meaning 'European olive' in Latin, is a species of small tree or shrub in the family Oleaceae, found traditionally in the Mediterranean Basin. When in shrub form, it is known as ''Olea europaea'' ' ...

''(Olea europaea laperrinei)''.

Fauna

Water from mountain streams makes the area an important habitat for wildlife such as a numbered of threatened

antelope The term antelope is used to refer to many species of even-toed ruminant that are indigenous to various regions in Africa and Eurasia. Antelope comprise a wastebasket taxon defined as any of numerous Old World grazing and browsing hoofed mamm ...

species such as

addax The addax (''Addax nasomaculatus''), also known as the white antelope and the screwhorn antelope, is an antelope native to the Sahara Desert. The only member of the genus ''Addax'', it was first described scientifically by Henri de Blainvil ...

''(Addax nasomaculatus)'', Dama gazelle ''(Gazella dama)'', Dorcas gazelle ''(Gazella dorcas)'' and Red-fronted gazelle ''(Gazella rufifrons)''. Endemic species include the Arid Thicket Rat ''(

Grammomys aridulus The arid thicket rat (''Grammomys aridulus'') is a species of rodent in the family Muridae. It is found only in Sudan. Its natural habitat is subtropical or tropical dry shrubland Shrubland, scrubland, scrub, brush, or bush is a plant communi ...

)'' from Jebel Marra. The mountains are home to birds of both Eurasia and Africa, species include Nubian bustard ''(

Neotis nuba The Nubian bustard (''Neotis nuba'') is a species of bird in the bustard family. This is a medium-large bustard found in the sparsely vegetated interface between the southern margins of the Sahara desert and the northern part of the Sahel. It is ...

)'' and Cinereous Vulture ''( Aegypius monachus)''.

Threats and preservation

Jebel Marra has been inhabited since antiquity and although the steep mountain valley areas are mainly uninhabited and undisturbed, habitat on the more accessible slopes has been affected. In Chad the ecoregion is thinly populated, mainly by nomadic pastoralists. Recent conflict in both Chad and Darfur have meant that less agriculture is taking place and to an extent original flora is reestablishing.

References

External links