Saharan halophytics | |
---|---|
Ecology | |
Realm | Palearctic |
Biome | Flooded grasslands and savannas |
Geography | |
Area | 54,031 km2 (20,861 sq mi) |
Country | Mauritania, Algeria, Tunisia, Libya, Egypt |
Coordinates | 29°15′S25°45′E / 29.25°S 25.75°E |
The Saharan halophytics ecoregion (WWF ID: PA0905) covers a series of low-lying evaporite depressions and wetlands spread across North Africa. The depressions are characteristically saline, variously chotts (saline lakes fed by groundwater and some winter rains) or sabkhas (coastal, supratidal mudflats of evaporites). The plants of the areas are highly specialized to survive in the harsh environment, with many being xerophytes (drought-tolerant) and halophytes (salt-tolerant). The biodiversity of the areas has been relatively protected by their isolation, and unsuitability of alkaline soil for farming. [1] [2] [3] [4]
The sites making up this ecoregion contain a wide variety of habitat types: salt pans, seasonal salt lakes, salt marshes, reed beds, and spring-fed oases. Chott and sebkha areas exist in arid regions with clay soils heavy with evaporites. Specific locations assigned to this ecoregion include:
The site are surrounded by terrain of the North Saharan steppe and woodlands ecoregion that extends across the northern Sahara. [2]
The climate of the ecoregion is Hot desert climate (Köppen climate classification (BWh)). This climate features stable air and high pressure aloft, producing a hot, arid desert. Hot-month temperatures typically average 29–35 °C (84–95 °F). [8] [9] Rainfall varies between 10–100 millimetres (0.39–3.94 in) per year. [1]
Vegetation within a site varies by soil salinity and sand tenure; these typically vary by distance from the center of a salt pan. Common species include Picklegrass ( Salicornia ), the generally subshrub genera Salsola , Saltbush ( Atriplex ), Halocnemum strobilaceum , and White wormwood ( Artemisia herba-alba ).
While there are some large mammals in these areas, the most common mammals are gerbils (the North African gerbil Gerbillus campestris and the Dipodillus ). An example of species diversity is that of the Chott el Hodna, in which have been identified 550 species of plants, 119 species of birds, 10 of reptiles and 20 of mammals. Animals of conservation in this area include the vulnerable Cuvier's gazelle ( Gazella cuvieri ) and the vulnerable Houbara bustard ( Chlamydotis undulata ). [4]
Over 25% of the ecoregion is officially protected. [3] These protected areas include:
The Qattara Depression is a depression in northwestern Egypt, specifically in the Matruh Governorate. The depression is part of the Western Desert of Egypt. The Qattara Depression lies below sea level, and its bottom is covered with salt pans, sand dunes, and salt marshes. The depression extends between the latitudes of 28°35' and 30°25' north and the longitudes of 26°20' and 29°02' east.
Lake Natron is a salt or alkaline lake located in north Ngorongoro District of Arusha Region in Tanzania at the border with Kenya. It is in the Gregory Rift, which is the eastern branch of the East African Rift. The lake is within the Lake Natron Basin, a Ramsar Site wetland of international significance. It is the only regular breeding area for Africa's lesser flamingoes, although this habitat is not protected and is under threat from planned development projects.
In geology, a chott, shott, or shatt is a salt lake in Africa's Maghreb that stays dry for much of the year but receives some water in the winter. The elevation of a chott surface is controlled by the position of the water table and capillary fringe, with sediment deflation occurring when the water table falls and sediment accumulation occurring when the water table rises. They are formed—within variable shores—by the spring thaw from the Atlas mountain range, along with occasional rainwater or groundwater sources in the Sahara, such as the Bas Saharan Basin.
el-Djerid, also al-Jarīd, or more precisely the South Western Tunisia Region is a semi-desert natural region comprising three southern Tunisian Governorates, Gafsa, Kebili and Tozeur with adjacent parts of Algeria and Libya.
The Etosha Pan is a large endorheic salt pan, forming part of the Cuvelai-Etosha Basin in the north of Namibia. It is a vast hollow in the ground in which water may collect or in which a deposit of salt remains after water has evaporated. The 120-kilometre-long (75-mile-long) dry lakebed and its surroundings are protected as Etosha National Park, Namibia's second-largest wildlife park, covering 22,270 square kilometres (8,600 sq mi). The pan is mostly dry but after heavy rains it is flooded with a thin layer of water, which is heavily salted by the mineral deposits on the surface.
Tozeur is the westernmost of the 24 governorates (provinces) of Tunisia and as such bordering Algeria. It covers an area of 4,719 km2 and has a population of 107,912 making it the least populated province. The capital is Tozeur.
Chott el Djerid also spelled Sciott Gerid and Shott el Jerid, is a chott, a large endorheic salt lake in southern Tunisia. The name can be translated from the Arabic into English as "Lagoon of the Land of Palms".
Chott Melrhir also known as Chott Melghir or Chott Melhir is an endorheic chott-kind of salt lake in northeastern Algeria. It is the westernmost part of a series of depressions, which extend from the Gulf of Gabès into the Sahara. They were created between Miocene and Early Pleistocene as a result of compression accompanying the formation of the Atlas Mountains. With the maximum area of about 6,700 km2 (2,600 sq mi), it is the largest lake in Algeria. It lies almost entirely below sea level and contains the lowest point in Algeria, −40 meters. Its size varies over the year and is usually larger than 130 km (81 mi) from east to west. The nearby cities are Biskra, El Oued and Touggourt.
Chott Ech Chergui is a large endorheic salt lake in Saïda Province, northwestern Algeria. It is located at 34.35°N 0.5°E in the level terrain of the Hautes Plaines region between the Tell Atlas and the Saharan Atlas and is one of the largest lakes in Algeria.
The wildlife of Libya is spread over the Mediterranean coastline and encompasses large areas of the Saharan desert. The protection of wildlife is provided through appropriate legislation in seven national parks, five reserves, 24 protected areas, two wetlands under Ramsar Convention, and also in other areas. Apart from these, there are also five UNESCO World Heritage Sites related to culture. The most important national parks are the El-Kouf National Park and Karabolli National Park. The well known nature reserves are the Benghazi Reserve and the Zellaf Reserve. The wildlife species recorded in the country are 87 mammals and 338 species of birds.
The Grand Erg Oriental is a large erg or "field of sand dunes" in the Sahara Desert. Situated for the most part in Saharan lowlands of northeast Algeria, the Grand Erg Oriental covers an area some 600 km wide by 200 km north to south. The erg's northeastern edge spills over into neighbouring Tunisia.
The Tunisian salt lakes are a series of lakes in central Tunisia, lying south of the Atlas Mountains at the northern edge of the Sahara. The lakes include, from east to west, the Chott el Fedjedj, Chott el Djerid, and Chott el Gharsa.
The North Saharan steppe and woodlands is a desert ecoregion, in the deserts and xeric shrublands biome, that forms the northern edge of the Sahara. It extends east and west across Northern Africa, south of the Mediterranean dry woodlands and steppe ecoregion of the Maghreb and Cyrenaica, which is part of the Mediterranean forests, woodlands, and scrub biome. Winter rains sustain shrublands and dry woodlands that form an ecotone between the Mediterranean climate regions to the north and the hyper-arid Sahara Desert ecoregion to the south.
The Chott el Hodna is a very shallow saline lake in Algeria. It is located within an endorheic basin in the Hodna region, towards the eastern end of the Hautes Plaines. The Chott el Hodna includes seasonal brackish and saline pools and marshes, but the central zone of the lake is characterized by a complete absence of vegetation.
The Hautes Plaines, also known in French as Hauts Plateaux, is a steppe-like natural region located in the Atlas Mountains in northern Algeria. It stretches more than 600 km (370 mi) in an east northeast – west southwest direction from northeastern Morocco to the Aures. It is a high plateau area consisting of undulating, steppe-like alluvial plains lying between the Tell and Saharan Atlas ranges.
The Hodna is a natural region of Algeria located between the Tell and Saharan Atlas ranges at the eastern end of the Hautes Plaines. It is a vast depression lying in the northeastern section of M'Sila Province and the western end of Batna Province.
The Central Anatolian steppe is a Palearctic ecoregion in the temperate grasslands, savannas, and shrublands biome. It covers an area of 24,934 km2.
Rostov Nature Reserve is a Russian 'zapovednik' that protects a variety of sensitive southern European steppe wetlands, the largest herd of wild horses in Europe, and also wetland habitat for birds. The protected areas are divided into five sections that cover the waters of Lake Manych-Gudilo, islands in that lake, surrounding steppe and shore lands. The reserve is situated in the Orlovsky District, of Rostov Oblast, about 100 km northeast of Rostov-on-Don. It is part of a Ramsar Wetland site of international importance.
Ivory Coast of Sviatoslav National Nature Park, in English the "white beaches of Sviatosloav", is situated on the north coast of the Black Sea in southern Ukraine. It covers portions of Dnieper–Bug estuary, the Kinburn Peninsula just south of the estuary, and Yahorlyk Bay, a shallow bay of the Black Sea itself. Adjacent to the site along the coast is the Black Sea Biosphere Reserve. The various tracts protect and display the steppe ecology of south Ukraine and the adjacent waters. The park is in Mykolaiv Raion in Mykolaiv Oblast.