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Ichkeul Lake
Lake Ichkeul () is a lake in northern Tunisia, located 20 kilometres (12 miles) to Bizerte, the northernmost city in Africa on the Mediterranean Sea. The lake and wetlands of Ichkeul National Park are an important stopping-over point for hundreds of thousands of migrating birds each year. Among the lake's visitors are ducks, geese, storks, and pink flamingoes. Dam construction on the lake's feeder rivers has produced major changes to the ecological balance of the lake and wetlands. History In the reign of the Hafsid dynasty, Lake Ichkuel was a reserve during the 13th century. It later became the property of the public domain in the early 20th century during French rule. Since 1980, it has been a UNESCO World Heritage Site. Because dams have sharply reduced the freshwater inflow to the lakes and marshes, the reedbeds, sedges, and other fresh-water plant species have been replaced with salt-loving plants. These changes have produced a sharp reduction in the migratory bird popula ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tunisia
Tunisia, officially the Republic of Tunisia, is a country in the Maghreb region of North Africa. It is bordered by Algeria to the west and southwest, Libya to the southeast, and the Mediterranean Sea to the north and east. Tunisia also shares maritime borders with Italy through the islands of Sicily and Sardinia to the north and Malta to the east. It features the archaeological sites of Carthage dating back to the 9th century BC, as well as the Great Mosque of Kairouan. Known for its ancient architecture, Souks of Tunis, souks, and blue coasts, it covers , and has a population of 12.1 million. It contains the eastern end of the Atlas Mountains and the northern reaches of the Sahara desert; much of its remaining territory is arable land. Its of coastline includes the African conjunction of the western and eastern parts of the Mediterranean Basin. Tunisia is home to Africa's northernmost point, Cape Angela. Located on the northeastern coast, Tunis is the capital and List of cities ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hafsid Dynasty
The Hafsid dynasty ( ) was a Sunni Muslim dynasty of Berbers, Berber descentC. Magbaily Fyle, ''Introduction to the History of African Civilization: Precolonial Africa'', (University Press of America, 1999), 84. that ruled Ifriqiya (modern day Tunisia, western Libya, and eastern Algeria) from 1229 to 1574. The dynasty was founded by Abu Zakariya Yahya, who was initially appointed governor of the region by the Almohad caliph before declaring his independence. Under the reigns of Abu Zakariya and his successor, Muhammad I al-Mustansir, al-Mustansir (), the Hafsids consolidated and expanded their power, with Tunis as their capital. After al-Mustansir's death, internal conflicts resulted in a division between an eastern branch of the dynasty ruling from Tunis and a Hafsids of Béjaïa, western branch ruling from Béjaïa and Constantine, Algeria, Consantine. A reunification took place under Abu Yahya Abu Bakr II (), but his death was followed by another crisis during which the Marinid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lakes Of Tunisia
A lake is often a naturally occurring, relatively large and fixed body of water on or near the Earth's surface. It is localized in a basin or interconnected basins surrounded by dry land. Lakes lie completely on land and are separate from the ocean, although they may be connected with the ocean by rivers. Lakes, as with other bodies of water, are part of the water cycle, the processes by which water moves around the Earth. Most lakes are fresh water and account for almost all the world's surface freshwater, but some are salt lakes with salinities even higher than that of seawater. Lakes vary significantly in surface area and volume of water. Lakes are typically larger and deeper than ponds, which are also water-filled basins on land, although there are no official definitions or scientific criteria distinguishing the two. Lakes are also distinct from lagoons, which are generally shallow tidal pools dammed by sandbars or other material at coastal regions of oceans or large ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of World Heritage In Danger
The List of World Heritage in Danger is compiled by the United Nations Educational, Scientific and Cultural Organization (UNESCO) through the World Heritage Committee according to Article 11.4 of the World Heritage Convention,Full title: ''Convention concerning the protection of the World Cultural and Natural Heritage'' which was established in 1972 to designate and manage World Heritage Sites. Entries in the list are threatened World Heritage Sites for the conservation of which major operations are required and for which "assistance has been requested". The list is intended to increase international awareness of the threats and to encourage counteractive measures. Threats to a site can be either proven imminent threats or potential dangers that could have adverse effects on a site. In the case of natural sites, ascertained dangers include the serious decline in the population of an endangered or other valuable species or the deterioration of natural beauty or scientific value o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World Heritage Sites
World Heritage Sites are landmarks and areas with legal protection under an international treaty administered by UNESCO for having cultural, historical, or scientific significance. The sites are judged to contain "cultural and natural heritage around the world considered to be of outstanding value to humanity". To be selected, a World Heritage Site is nominated by its host country and determined by the UNESCO's World Heritage Committee to be a unique landmark which is geographically and historically identifiable, having a special cultural or physical significance, and to be under a sufficient system of legal protection. World Heritage Sites might be ancient ruins or historical structures, buildings, cities, deserts, forests, islands, lakes, monuments, mountains or wilderness areas, and others. A World Heritage Site may signify a remarkable accomplishment of humankind and serve as evidence of humanity's intellectual history on the planet, or it might be a place of great natur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
UNESCO
The United Nations Educational, Scientific and Cultural Organization (UNESCO ) is a List of specialized agencies of the United Nations, specialized agency of the United Nations (UN) with the aim of promoting world peace and International security, security through international cooperation in education, arts, sciences and culture. It has 194 Member states of UNESCO, member states and 12 associate members, as well as partners in the Non-governmental organization, non-governmental, Intergovernmental organization, intergovernmental and private sector. Headquartered in Paris, France, UNESCO has 53 regional field offices and 199 National Commissions for UNESCO, national commissions. UNESCO was founded in 1945 as the successor to the League of Nations' International Committee on Intellectual Cooperation.English summary). UNESCO's founding mission, which was shaped by the events of World War II, is to advance peace, sustainable development and human rights by facilitating collaboratio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ichkeul National Park 0001
Lake Ichkeul () is a lake in northern Tunisia, located 20 kilometres (12 miles) to Bizerte, the northernmost city in Africa on the Mediterranean Sea. The lake and wetlands of Ichkeul National Park are an important stopping-over point for hundreds of thousands of migrating birds each year. Among the lake's visitors are ducks, geese, storks, and pink flamingoes. Dam construction on the lake's feeder rivers has produced major changes to the ecological balance of the lake and wetlands. History In the reign of the Hafsid dynasty, Lake Ichkuel was a reserve during the 13th century. It later became the property of the public domain in the early 20th century during French rule. Since 1980, it has been a UNESCO World Heritage Site. Because dams have sharply reduced the freshwater inflow to the lakes and marshes, the reedbeds, sedges, and other fresh-water plant species have been replaced with salt-loving plants. These changes have produced a sharp reduction in the migratory bird popula ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World Conservation Union
The International Union for Conservation of Nature (IUCN) is an international organization working in the field of nature conservation and sustainable use of natural resources. Founded in 1948, IUCN has become the global authority on the status of the natural world and the measures needed to safeguard it. It is involved in data gathering and analysis, research, field projects, advocacy, and education. IUCN's mission is to "influence, encourage and assist societies throughout the world to conserve nature and to ensure that any use of natural resources is equitable and ecologically sustainable". Over the past decades, IUCN has widened its focus beyond conservation ecology and now incorporates issues related to sustainable development in its projects. IUCN does not itself aim to mobilize the public in support of nature conservation. It tries to influence the actions of governments, business and other stakeholders by providing information and advice and through building partnershi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salinity
Salinity () is the saltiness or amount of salt (chemistry), salt dissolved in a body of water, called saline water (see also soil salinity). It is usually measured in g/L or g/kg (grams of salt per liter/kilogram of water; the latter is dimensionless and equal to per mille, ‰). Salinity is an important factor in determining many aspects of the chemistry of natural waters and of biological processes within it, and is a state function, thermodynamic state variable that, along with temperature and pressure, governs physical characteristics like the density and heat capacity of the water. A contour line of constant salinity is called an ''isohaline'', or sometimes ''isohale''. Definitions Salinity in rivers, lakes, and the ocean is conceptually simple, but technically challenging to define and measure precisely. Conceptually the salinity is the quantity of dissolved salt content of the water. Salts are compounds like sodium chloride, magnesium sulfate, potassium nitrate, and sod ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fresh Water
Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salt (chemistry), salts and other total dissolved solids. The term excludes seawater and brackish water, but it does include non-salty mineral water, mineral-rich waters, such as chalybeate springs. Fresh water may encompass frozen water, frozen and meltwater in ice sheets, ice caps, glaciers, snowfields and icebergs, natural precipitations such as rainfall, snowfall, hail/ice pellets, sleet and graupel, and surface runoffs that form inland bodies of water such as wetlands, ponds, lakes, rivers, streams, as well as groundwater contained in aquifers, subterranea (geography), subterranean subterranean river, rivers and underground lake, lakes. Water is critical to the survival of all living organisms. Many organisms can thrive on salt water, but the great majority of vascular plants and most insects, amphibians, reptiles, mammals and birds need fresh water to sur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyperaceae
The Cyperaceae () are a family of graminoid (grass-like), monocotyledonous flowering plants known as wikt:sedge, sedges. The family (biology), family is large; botanists have species description, described some 5,500 known species in about 90 genus, generathe largest being the "true wikt:sedge, sedges" (genus ''Carex''), with over 2,000 species. Distribution Cyperaceae species are widely distributed with the centers of diversity for the group occurring in tropical Asia and tropical South America. While sedges grow in almost all environments, many thrive in wetlands or in poor soils. Community (ecology), Ecological communities dominated by sedges are known as s or as sedge meadows. Classification Some species superficially resemble the closely related Juncaceae , rushes and the more distantly related grasses. Features distinguishing members of the sedge family from grasses or rushes are stems with triangular cross-sections (with occasional exceptions, a notable example be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reedbed
A reedbed or reed bed is a natural habitat found in floodplains, waterlogged depressions and estuaries. Reedbeds are part of a succession from young reeds colonising open water or wet ground through a gradation of increasingly dry ground. As reedbeds age, they build up a considerable litter layer that eventually rises above the water level and that ultimately provides opportunities in the form of new areas for larger terrestrial plants such as shrubs and trees to colonise. Artificial reedbeds are used to remove pollutants from greywater, and are also called constructed wetlands. Types Reedbeds vary in the species that they can support, depending upon water levels within the wetland system, climate, seasonal variations, and the nutrient status and salinity of the water. ''Reed swamps'' have 20 cm or more of surface water during the summer and often have high invertebrate and bird species use. ''Reed fens'' have water levels at or below the surface during the summer and are o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
