The Mediterranean Basin covers portions of three continents: Europe, Africa, and Asia. It is distinct from the drainage basin, which extends much further south and north due to major rivers ending in the Mediterranean Sea, such as the Nile and Rhône. Conversely, the Mediterranean Basin includes regions not in the drainage basin.[1]
It has a varied and contrasting topography. The Mediterranean Region offers an ever-changing landscape of high mountains, rocky shores, impenetrable scrub, semi-arid steppes, coastal wetlands, sandy beaches and a myriad of islands of various shapes and sizes dotted amidst the clear blue sea. Contrary to the classic sandy beach images portrayed in most tourist brochures, the Mediterranean is surprisingly hilly. Mountains can be seen from almost anywhere.[2]
By definition, the Mediterranean Basin extends from Macaronesia in the west, to the Levant in the east, although some places may or may not be included depending on the view, as is the case with Macaronesia: some definitions only include Madeira and the Canary Islands[3] while others include the whole Macaronesia (with the Azores and Cape Verde).[4]
In Western Asia, it covers the western and southern portions of the peninsula of Anatolia, as far as Iraq,[5] but excluding the temperate-climate mountains of central Turkey. It includes the Mediterranean Levant at the eastern end of the Mediterranean, bounded on the east and south by the Syrian and Negev deserts.
The northern portion of the Maghreb region of northwestern Africa has a Mediterranean climate, separated from the Sahara Desert, which extends across North Africa, by the Atlas Mountains. In the eastern Mediterranean the Sahara extends to the southern shore of the Mediterranean, with the exception of the northern fringe of the peninsula of CyrenaicainLibya, which has a dry Mediterranean climate.
The Mediterranean Basin was shaped by the ancient collision of the northward-moving African–Arabian continent with the stable Eurasian continent. As Africa–Arabia moved north, it closed the former Tethys Sea, which formerly separated Eurasia from the ancient super continent of Gondwana, of which Africa was part. At about the same time, 170 mya in the Jurassic period, a small Neotethys ocean basin formed shortly before the Tethys Sea was closed at the eastern end. The collision pushed up a vast system of mountains, extending from the Pyrenees in Spain to the Zagros MountainsinIran. This episode of mountain building, known as the Alpine orogeny, occurred mostly during the Oligocene (34 to 23 million years ago (mya)) and Miocene (23 to 5.3 mya) epochs. The Neotethys became larger during these collisions and associated folding and subduction.
About 6 mya during the late Miocene, the Mediterranean was closed at its western end by drifting Africa, which caused the entire sea to evaporate. There followed several (debated) episodes of sea drawdown and re-flooding known as the Messinian Salinity Crisis, which ended when the Atlantic last re-flooded the basin at the end of the Miocene.[6] Recent research has suggested that a desiccation-flooding cycle may have repeated several times [7][8] during the last 630,000 years of the Miocene epoch, which could explain several events of large amounts of salt deposition. Recent studies, however, show that repeated desiccation and re-flooding is unlikely from a geodynamic point of view.[9][10]
The end of the Miocene also marked a change in the Mediterranean Basin's climate. Fossil evidence shows that the Mediterranean Basin had a relatively humid subtropical climate with summer rainfall during the Miocene, which supported laurel forests. The shift to a Mediterranean climate occurred within the last 3.2–2.8 million years, during the Pliocene epoch, as summer rainfall decreased. The subtropical laurel forests retreated, although they persisted on the islands of Macaronesia off the Atlantic coast of Iberia and North Africa, and the present Mediterranean vegetation evolved, dominated by coniferous trees and sclerophyllous trees and shrubs, with small, hard, waxy leaves that prevent moisture loss in the dry summers. Much of these forests and shrublands have been altered beyond recognition by thousands of years of human habitation. There are now very few relatively intact natural areas in what was once a heavily wooded region.
The Mediterranean Basin is the largest of the world's five Mediterranean forests, woodlands, and scrub regions. It is home to a number of plant communities, which vary with rainfall, elevation, latitude, and soil.
Scrublands occur in the driest areas, especially areas near the seacoast where wind and salt spray are frequent. Low, soft-leaved scrublands around the Mediterranean are known as garrigarinCatalan, garrigueinFrench, phryganainGreek, tomillaresinSpanish, and bathainHebrew.
Shrublands are dense thickets of evergreen sclerophyll shrubs and small trees and are the most common plant community around the Mediterranean. Mediterranean shrublands are known as màquia in Catalan, macchiainItalian, maquis in French, and "matorral" in Spanish. In some places, shrublands are the mature vegetation type, and in other places the result of the degradation of former forest or woodland by logging or overgrazing, or disturbance by major fires.
Woodlands are usually dominated by oak and pine, mixed with other sclerophyll and coniferous trees.
Forests are distinct from woodlands in having a closed canopy, and occur in the areas of highest rainfall and in riparian zones along rivers and streams where they receive summer water. Mediterranean forests are generally composed of evergreen trees, predominantly oak and pine. At higher elevations Mediterranean forests transition to mixed broadleaf and tall conifer forests similar to temperate zone forests.
The Mediterranean Basin is home to considerable biodiversity, including 22,500 endemicvascular plantspecies. Conservation International designates the region as a biodiversity hotspot, because of its rich biodiversity and its threatened status. The Mediterranean Basin has an area of 2,085,292 km2, of which only 98,009 km2 remains undisturbed.
Neanderthals inhabited western Asia and the non-glaciated portions of Europe starting about 230,000 years ago. Modern humans moved into western Asia from Africa less than 100,000 years ago. Modern humans, known as Cro-Magnons, moved into Europe approximately 50–40,000 years ago.
A strengthening of the summer monsoon 9000–7000 years ago increased rainfall across the Sahara, which became a grassland, with lakes, rivers, and wetlands. After a period of climatic instability, the Sahara settled into a desert state by the 4th millennium BCE.
One of the earliest modern studies of the Mediterranean was Fernand Braudel's La Méditerranéee et le monde méditerranéen à l époque de Philippe II (The Mediterranean and the Mediterranean World in the Age of Philip II), published in 1949. S.D. Goitein's multivolume study of the Cairo Geniza documents was another important contribution in the area of Mediterranean Jewish culture.[12]
Wheat is the dominant grain grown around the Mediterranean Basin. Pulses and vegetables are also grown. The characteristic tree crop is the olive. Figs are another important fruit tree, and citrus, especially lemons, are grown where irrigation is present. Grapes are an important vine crop, grown for fruit and to make wine. Rice and summer vegetables are grown in irrigated areas.
Dallman, Peter F. (1998). Plant Life in the World's Mediterranean Climates. Berkeley, California: University of California Press. {{cite book}}: |work= ignored (help)
