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Mediterranean forests, woodlands, and scrub
Mediterranean forests, woodlands, and scrub is a biome defined by the World Wide Fund for Nature.[1] The biome is generally characterized by dry summers and rainy winters, although in some areas rainfall may be uniform. Summers are typically hot in low-lying inland locations but can be cool near colder seas. Winters are typically mild to cool in low-lying locations but can be cold in inland and higher locations. All these ecoregions are highly distinctive, collectively harboring 10% of the Earth's plant species.[2]
Extent of Mediterranean forests, woodlands, and scrub
Distribution
A Mediterranean forest, the Upper Galilee
The Mediterranean forests, woodlands, and scrub biome mostly occurs in, but not limited to, the Mediterranean climate zones, in the mid-latitudes:[1]
The biome is not limited to the Mediterranean climate zone. It can also be present in other climate zones (which typically border the Mediterranean climate zone), such as the drier regions of the oceanic and humid subtropical climates, and as well as the lusher areas of the semi-arid climate zone. Non-Mediterranean climate regions that would feature Mediterranean vegetation include the Nile River Valley in Egypt (extending upstream along the riverbanks), parts of the Eastern Cape in South Africa, southeastern Australia, southeastern Azerbaijan, southeastern Turkey, far northern Iraq, the Mazandaran Province in Iran, Central Italy, parts of the Balkans (including Northern Greece), as well as Northern and Western Jordan.
Vegetation
Close up of Ephesos ancient Greek amphitheatre with a maquis shrubland
Vegetation types range from forests to woodlands, savannas, shrublands, and grasslands; "mosaic habitat" landscapes are common, where differing vegetation types are interleaved with one another in complex patterns created by variations in soil, topography, exposure to wind and sun, and fire history. Much of the woody vegetation in Mediterranean-climate regions is sclerophyll, which means 'hard-leaved' in Greek. Sclerophyllous vegetation generally has small, dark leaves covered with a waxy outer layer to retain moisture in the dry summer months.
Phytogeographers consider the fynbos (South Africa) as a separate floral kingdom because 68% of the 8,600 vascular plant species crowded into its 90,000 square kilometers (35,000 sq mi) are endemic and highly distinctive at several taxonomic levels.[1][3] This is equivalent to about 40% of the plant species of the United States and Canada combined, found within an area the size of the state of Maine. The fynbos and Southwest Australia shrublands have flora that are significantly more diverse than the other ecoregions, although any Mediterranean shrubland is still rich in species and endemics relative to other non-forest ecoregions.[1][3]
Biome plant groups
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Springtime in Chilean Matorral a few kilometers north of Santiago along the Pan-American Highway
Major plant communities in this biome include:
Fire as a medium of change
Further information: Fire ecology
Scrubland of the Sierra Pelona Mountains, Southern California
Fire, both natural and human-caused, has played a large role in shaping the ecology of Mediterranean ecoregions.[4] The hot, dry summers make much of the region prone to fires, and lightning-caused fires occur with some frequency. Many of the plants are pyrophytes, or fire-loving, adapted or even depending on fire for reproduction, recycling of nutrients, and the removal of dead or senescent vegetation. In both the Australian and Californian Mediterranean-climate eco-regions, native peoples used fire extensively to clear brush and trees, making way for the grasses and herbaceous vegetation that supported game animals and useful plants.
The plant communities in these areas adapted to the frequent human-caused fires, and pyrophyte species grew more common and more fire-loving, while plants that were poorly adapted to fire retreated. After European colonization of these regions, fires were suppressed, which has caused some unintended consequences in these ecoregions; fuel builds up, so that when fires do come they are much more devastating, and some species dependent on fire for their reproduction are now threatened. The European shrublands have also been shaped by anthropogenic fire,[5] historically associated with transhumance herding of sheep and goats.
Degradation
Mediterranean cork oak trees (Quercus suber) in Monchique, in the Algarve region of Portugal
A dry sclerophyll woodland in Sydney
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Mediterranean ecoregions are some of the most endangered and vulnerable on the planet. Many have suffered tremendous degradation and habitat loss through logging, overgrazing, conversion to agriculture, urbanization, fire suppression, and introduction of exotic and invasive species. The ecoregions around the Mediterranean basin and in California have been particularly affected by degradation due to human activity, suffering extensive loss of forests and soil erosion, and many native plants and animals have become extinct or endangered.
See also
References
  1. ^ a b c d
     This article incorporates text available under the CC BY-SA 3.0 license. World Wide Fund for Nature. "Mediterranean Forests, Woodlands, and Scrub Ecoregions". Archived from the original on 2011-04-01. Retrieved 2010-05-27.
  2. ^ Cody, M.L. (1986). "Diversity, rarity, and conservation in Mediterranean-climate regions". In Soulé, M.E. (ed.). Conservation biology. Massachusetts, USA. pp. 122–152.
  3. ^ a b Cowling, R.M.; MacDonald, I.A.W.; Simmons, M.T. (1996). "The Cape Peninsula, South Africa: Physiographical, biological and historical background to an extraordinary hot-spot of biodiversity". Biodiversity and Conservation. 5 (5): 527–550. doi:10.1007/bf00137608.
  4. ^ Gil-Tena, Assu; Aquilue, Nuria; Duane, Andrea; de Caceres, Miquel; Brotons, Lluis (2016). "Mediterranean fire regime effects on pine-oak forest landscape mosaics under global change in NE Spain". European Journal of Forest Research. 135 (2): 403–416. doi​:​10.1007/s10342-016-0943-1​.
  5. ^ Casals, Pere; Valor, Teresa; Besalú, Arnau; Molina-Terren, Domingo (2016). "Understory fuel load and structure eight to nine years after prescribed burning in Mediterranean pine forests" (PDF). Forest Ecology and Management. 362: 156–168. doi​:​10.1016/j.foreco.2015.11.050​.
External links
Media related to Mediterranean forests, woodlands, and scrub at Wikimedia Commons
National Geographic Global 200 Ecoregions: Mediterranean Forest, Woodland and Scrub. Part of National Geographic's Wild World Terrestrial Ecoregions of the World mapping project.
Last edited on 31 May 2021, at 22:51
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