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| Saharo-Arabian | |
|---|---|
| Name | Saharo-Arabian |
| Biogeographic realm | Palearctic |
| Biome | Desert and xeric shrublands |
| Countries | Algeria; Egypt; Libya; Morocco; Tunisia; Mauritania; Western Sahara; Saudi Arabia; Yemen; Oman; United Arab Emirates; Jordan; Israel; Palestine; Syria; Iraq; Iran; Sudan |
Saharo-Arabian The Saharo-Arabian is a Palearctic desert and xeric shrublands region spanning the Sahara, Arabian Peninsula, and adjacent arid zones. It connects landscapes associated with Atlas Mountains, Euphrates River, Nile River, Red Sea, and Persian Gulf, influencing biogeographic links between North Africa, Levant, and Arabian Peninsula. The region interfaces with ecoregions recognized in studies by institutions such as the International Union for Conservation of Nature, World Wildlife Fund, Royal Botanic Gardens, Kew, Natural History Museum, London, and national agencies including Environment Agency Abu Dhabi.
The Saharo-Arabian covers the hyperarid and arid belts from Morocco and Mauritania across Algeria, Tunisia, Libya, Egypt to the Sinai Peninsula and Levantine margins, then eastward through Saudi Arabia, Yemen, Oman, United Arab Emirates, Qatar, Kuwait, Iraq and into Iran. Boundaries abut ecoregions around the Mediterranean Basin, Sahel, Horn of Africa, Irano-Turanian, and Red Sea coastal zones. Major geographic features include the Sahara Desert, Rub' al Khali, Negev Desert, Syrian Desert, Tibesti Mountains, Ahaggar Mountains, and coastal systems along the Gulf of Aden and Gulf of Oman. Political and conservation jurisdictions involve entities such as African Union, Arab League, United Nations Environment Programme, and national ministries like Ministry of Environment (Egypt) and Saudi Wildlife Authority.
Climatic regimes range from hyperarid to semiarid with extreme continentality influenced by the Hadley Cell, subtropical high pressure systems studied by the Intergovernmental Panel on Climate Change, and monsoon interactions associated with the Indian Ocean Dipole. Weather phenomena include dust storms linked to sources like the Bodélé Depression and cyclonic influences from systems monitored by World Meteorological Organization and regional centers such as Met Office. Biogeographic affinities show exchanges with taxa typical of the Mediterranean Basin, Sahelian savannas, and Irano-Turanian steppes noted in literature from JSTOR, Nature, Science, Proceedings of the National Academy of Sciences, and museum collections at Smithsonian Institution. Paleoclimatic reconstructions using data from Lake Chad, Dead Sea, and Mediterranean Sea cores inform Holocene shifts and routes used by species and peoples recorded by researchers at Max Planck Institute for Chemical Ecology and CNRS.
Vegetation is characterized by drought-adapted assemblages documented in floras from Royal Botanic Gardens, Kew, Flora of Egypt, and regional herbaria at Herbarium NAP. Key plant taxa include species of genera such as Acacia, Tamarix, Artemisia, Zygophyllum, and Atriplex recorded in botanical surveys by Kew's Plant List and monographs from University of Oxford and Cairo University. Faunal elements encompass desert specialists and migratory taxa: mammals like Dorcas gazelle, Addax, Sand cat, Fennec fox noted in IUCN assessments; reptiles such as Uromastyx, Cerastes vipera, and Horned viper; and birds including Sociable lapwing, Brown-necked raven, Bar-tailed lark with records from BirdLife International, Royal Society for the Protection of Birds, and regional ringing programs at Israel Nature and Parks Authority. Endemic and relict populations are subjects of study at Zoological Society of London, Smithsonian Institution, and universities like King Saud University and American University of Beirut.
Substrates range from sand seas (ergs) such as the Great Sand Sea and Empty Quarter to stony plateaus (hamada), reg, and gravel plains mapped by United States Geological Survey and geoscience departments at Imperial College London. Bedrock includes Precambrian crystalline shields exposed in Tibesti and Hoggar and Phanerozoic sedimentary sequences along basins like the Gulf of Suez and Persian Gulf studied by British Geological Survey and Geological Survey of Iran. Soils are saline, lithosols, and calcisols evaluated by Food and Agriculture Organization and soil science groups at University of California, Davis. Hydrogeology features fossil aquifers such as the Nubian Sandstone Aquifer System and renewable systems linked to wadis and oases monitored by UNESCO and national water authorities like Ministry of Water Resources (Iraq).
Human presence spans Paleolithic occupations evidenced at sites like Jebel Sahaba, Neolithic settlements along the Nile Valley and Fertile Crescent, and historic trade routes including the Incense Route, Silk Road fringes, and trans-Saharan caravans connecting to Timbuktu and Cairo. Empires and polities interacting with the landscape include Ancient Egypt, Phoenicia, Roman Empire, Aksumite Empire, Umayyad Caliphate, Ottoman Empire, and modern states such as Kingdom of Saudi Arabia and Republic of Tunisia. Cultural heritage manifests in rock art at Tadrart Acacus and Valley of the Kings, architecture like Petra, and material culture curated by institutions including the British Museum, Louvre, and Egyptian Museum. Contemporary livelihoods rely on pastoralism (Bedouin systems recorded by UNDP), oasis agriculture using qanats and wells documented by World Bank, and resource extraction industries such as petroleum operations by Saudi Aramco and National Iranian Oil Company.
Threats include habitat loss from oil and gas development documented by International Energy Agency, overgrazing noted in FAO reports, groundwater depletion affecting the Nubian Sandstone Aquifer System, and climate change impacts modeled by the IPCC. Conservation actions are led by networks including Convention on Biological Diversity, Ramsar Convention, CITES, and regional protected-area programs like Saudi Wildlife Authority reserves, IUCN Red List assessments, and transboundary initiatives between Algeria and Morocco or Egypt and Sudan. Restoration and sustainable management projects involve partners such as WWF, Conservation International, BirdLife International, universities like University of Khartoum, and donor agencies such as Global Environment Facility.