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Lake Chad Flooded Savanna
The Lake Chad flooded savanna is a flooded grasslands and savannas ecoregion in Africa. It includes the seasonally- and permanently-flooded grasslands and savannas in the basin of Lake Chad in Central Africa, and covers portions of Cameroon, Chad, Niger, and Nigeria. Geography Lake Chad is a large shallow lake, lying at the center of a large closed drainage basin, with no outlet to the sea. The Lake Chad basin has an area of . The northern portion of the basin is arid or semi-arid, and the southern portion has a seasonally-dry savanna climate. The flooded savannas surround the lake. The Chari and Logone rivers, which drain northwards from the highlands along the basin's southern edge, supply 95% of Lake Chad's freshwater. The Yobe River, which flows eastwards into the lake's northern end, contributes 2.5% of the lake's inflow. Accessed 7 July 2020. Despite having no outlet, Lake Chad has relatively low salinity. The saltier waters sink to the bottom of the lake, and dr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Chad
Lake Chad (french: Lac Tchad) is a historically large, shallow, endorheic lake in Central Africa, which has varied in size over the centuries. According to the ''Global Resource Information Database'' of the United Nations Environment Programme, it shrank by as much as 95% from about 1963 to 1998. The lowest area was in 1986, at , but "the 2007 (satellite) image shows significant improvement over previous years." Lake Chad is economically important, providing water to more than 30 million people living in the four countries surrounding it (Chad, Cameroon, Niger, and Nigeria) on the central part of the Sahel. It is the largest lake in the Chad Basin. Geography and hydrology The freshwater lake is located in the Sahelian zone of West-central Africa. It is located in the interior basin which used to be occupied by a much larger ancient sea sometimes called Mega Chad. The lake is historically ranked as one of the largest lakes in Africa. Its surface area varies by season as well a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Afrotropical Realm
The Afrotropical realm is one of Earth's eight biogeographic realms. It includes Africa south of the Sahara Desert, the majority of the Arabian Peninsula, the island of Madagascar, southern Iran and extreme southwestern Pakistan, and the islands of the western Indian Ocean. It was formerly known as the Ethiopian Zone or Ethiopian Region. Major ecological regions Most of the Afrotropic, with the exception of Africa's southern tip, has a tropical climate. A broad belt of deserts, including the Atlantic and Sahara deserts of northern Africa and the Arabian Desert of the Arabian Peninsula, separate the Afrotropic from the Palearctic realm, which includes northern Africa and temperate Eurasia. Sahel and Sudan South of the Sahara, two belts of tropical grassland and savanna run east and west across the continent, from the Atlantic Ocean to the Ethiopian Highlands. Immediately south of the Sahara lies the Sahel belt, a transitional zone of semi-arid short grassland and vach ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jama'are River
The Jama'are River, also known as the Bunga River in its upper reaches, starts in the highlands near Jos, Plateau State, Nigeria and flows northeast through Bauchi State and Yobe State before joining the Hadejia River to form the Yobe River. There has recently been controversy over a plan to build the Kafin Zaki Dam The Kafin Zaki Dam is a controversial project to build a reservoir on the Jama'are River (also called the Bunga River in its upper reaches) in Bauchi State in the Northeast of Nigeria. Proposed dam and reservoir The proposed dam would be of z ... on this river, with concerns over the effect on seasonal flooding and the water table. External links * * References Rivers of Nigeria Bauchi State Yobe State {{Nigeria-river-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acacia Seyal
''Vachellia seyal'', the red acacia, known also as the shittah tree (the source of shittim wood), is a thorny, 6– to 10-m-high (20 to 30 ft) tree with a pale greenish or reddish bark. At the base of the feathery leaves, two straight, light grey thorns grow to long. The blossoms are displayed in round, bright yellow clusters about diameter. In ''Vachellia seyal'' var. ''fistula'', which is more common on heavy clay soils, some of the thorns are swollen and house symbiotic ants. It is distributed from Egypt to Kenya and west Senegal. In the Sahara, it often grows in damp valleys. It is also found at'' wadis'' on the Arabian Peninsula. Varieties Two varieties are recognized: * ''Vachellia seyal'' var. ''fistula'' (Schweinf.) Kyal. & Boatwr. * ''Vachellia seyal'' var. ''seyal'' (Delile) P.J.H.Hurter Hybrids ''Vachellia seyal'' occasionally hybridizes with ''V. xanthophloea''. Uses Gum arabic ''Vachellia seyal'' is, along with other ''Vachellias'', an importa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyparrhenia Rufa
''Hyparrhenia rufa'' is a species of grass known by the common names jaraguá,''Hyparrhenia rufa'' (Nees) Stapf. FAO. jaraguá grass, and giant thatching grass. It is native to and it is widespread in the world as a cultivated and for and a |
Oryza Longistaminata
''Oryza longistaminata'' is a perennial species of grass from the same genus as cultivated rice (''O. sativa''). It is native to most of sub-Saharan Africa and Madagascar. It has been introduced into the United States, where it is often regarded as a noxious weed A noxious weed, harmful weed or injurious weed is a weed that has been designated by an agricultural or other governing authority as a plant that is injurious to agricultural or horticultural crops, natural habitats or ecosystems, or humans or liv .... Its common names are longstamen rice and red rice. The host resistance gene, ''Xa21'', from ''O. longistaminata'', has been integrated into the genome of '' O. sativa'' as it confers broad resistance to rice blight disease caused by ''Xanthomonas oryzae'' pv. ''oryzae''. Distribution ''O. longistaminata'' is native throughout Africa. References External links longistaminata Grasses of Africa Plants described in 1914 Weeds Taxa named by Auguste Chevalier [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vetiveria Nigritana
''Chrysopogon nigritanus'', more widely known by the taxonomic synonym ''Vetiveria nigritana'', or the common name black vetivergrass, is a perennial grass species of the family Poaceae and therefore is also a monocotyledon. Champagnant ''et al.'' (2007), p. 488. More specifically, ''Vetiveria nigritana'' is a very thick and tall type of grass that is deeply rooted within the ground and is usually used to protect crops and deter soil erosion. ''Vetiveria nigritana'' is also a native species to Africa and is most commonly seen in Nigeria, Northern Africa, Eastern Africa and tropical parts of Southern Africa. In addition, the plant, like other vetiver grasses, has been used in these regions due to its extreme drought tolerance, ability to grow in infertile soil and the fact that it can live under complete submergence. Grimshaw (1994), p. 44. In fact, ''Vetiveria nigritana'' can thrive in a very diverse range of environmental and climatic conditions. ''Vetiveria nigritana'' is a ver ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echinochloa Pyramidalis
''Echinochloa pyramidalis'' is a species of large grass, occurring naturally in flooded regions and beside lakes in tropical Africa and America, and introduced to various other countries. It is commonly known as antelope grass. Description ''Echinochloa pyramidalis'' is a large, perennial, reed-like grass growing to a height of about or even taller. The stems are solid and roots grow from the lower nodes. The leaves are stiff and blade-shaped and up to long, the ligules of the lower leaves having a fringe of short hairs round the margin which are absent from those of the upper leaves. The leaf sheaths can be either hairy or glabrous (hairless). The inflorescence has a central axis some long, the racemes on either side being up to long and bearing short-stalked, purplish, acute, awnless spikelets some long. This is a strong-growing plant with a fasciculated (arranged in bundles) root system and in suitable localities, forms dense stands of even height. Distribution and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yaéré
The Yaéré, from Fula ', is the name of a vast annually- flooded grassland and savanna, part of the extensive floodplains around the shallow and variable Lake Chad in Central Africa. The Yaéré is part of the Lake Chad flooded savanna ecoregion. Accessed 7 July 2020. Geography The Yaéré covers areas of northeasternmost Nigeria, of Niger, of southern Chad and of the Far North Region of Cameroon. The Yaéré extends from the low hills at the base of the Mandara Mountains in the southwest to Lake Chad in the north. In the east it merges with the permanent wetlands bordering the Logone. At the beginning of the wet season the clays that compose the soil expand and form an impermeable pan over which the water collects. It is connected to the more permanent wetlands along the Logone River, which flows into the endorheic Lake Chad and seasonally overflows into the surrounding Yaéré savanna. Torrential seasonal rains also drain from the Mandara Mountains, bringing a rich sediment to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pistia Stratiotes
''Pistia'' is a genus of aquatic plants in the arum family, Araceae. It is the sole genus in the tribe ''Pistieae'' which reflects its systematic isolation within the family. The single species it comprises, ''Pistia stratiotes'', is often called water cabbage, water lettuce, Nile cabbage, or shellflower. Its native distribution is uncertain but is probably pantropical; it was first discovered from the Nile near Lake Victoria in Africa. It is now present, either naturally or through human introduction, in nearly all tropical and subtropical fresh waterways and is considered an invasive species as well as a mosquito breeding habitat. The genus name is derived from the Greek word πιστός (''pistos''), meaning "water," and refers to the aquatic nature of the plants. The specific epithet is also derived from a Greek word, στρατιώτης, meaning "soldier," which references the sword-shaped leaves of some plants in the ''Stratiotes'' genus. Description ''Pistia stratiotes'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Typha Domingensis
''Typha domingensis'', known commonly as southern cattail or cumbungi, is a perennial herbaceous plant of the genus ''Typha''. Distribution and habitat It is found throughout temperate and tropical regions worldwide. It is sometimes found as a subdominant associate in mangrove ecosystems such as the Petenes mangroves ecoregion of Yucatán. Uses In the Mesopotamian Marshes of southern Iraq, Khirret is a dessert made from the pollen of this plant. In Turkish folk medicine the female inflorescences of this plant and other ''Typha'' are used externally to treat wounds such as burns. Extracts of ''T. domingensis'' have been demonstrated to have wound healing properties in rat models. Water extracts of the fruit, female flower and male flower of ''Typha domingensis'' exhibit iron chelating activity as well as superoxide and nitric oxide Nitric oxide (nitrogen oxide or nitrogen monoxide) is a colorless gas with the formula . It is one of the principal oxides of nitroge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phragmites Australis
''Phragmites australis'', known as the common reed, is a species of plant. It is a broadly distributed wetland grass that can grow up to tall. Description ''Phragmites australis'' commonly forms extensive stands (known as reed beds), which may be as much as or more in extent. Where conditions are suitable it can also spread at or more per year by horizontal runners, which put down roots at regular intervals. It can grow in damp ground, in standing water up to or so deep, or even as a floating mat. The erect stems grow to tall, with the tallest plants growing in areas with hot summers and fertile growing conditions. The leaves are long and broad. The flowers are produced in late summer in a dense, dark purple panicle, about long. Later the numerous long, narrow, sharp pointed spikelets appear greyer due to the growth of long, silky hairs. These eventually help disperse the minute seeds. Taxonomy Recent studies have characterized morphological distinctions between the i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
