- Valdivian temperate rain forests
The Valdivian temperate rain forests are a temperate broadleaf and mixed forest ecoregion located on the west coast of southern
South America , lying mostly inChile and extending into a small part ofArgentina . It part of theNeotropic ecozone . The forests are named after the city of Valdivia.etting
The Valdivian temperate rain forests comprise a relatively narrow coastal strip between the
Pacific Ocean to the west, and the southernAndes Mountains to the east, from roughly 35º to 48º south latitude. North of 42º, the Chilean coastal range runs along the coast, and the north-south runningChilean Central Valley lies between the coastal range and the Andes. South of 42º, the coast range continues as a chain of offshore islands, includingChiloé Island and theChonos Archipelago , while the "Central Valley" is submerged and continues as theGulf of Corcovado . Much of the ecogregion was covered by thePatagonian Ice Sheet and otherglacier s at the peak of the lastice age , which descended from the Andes mountains, and the numerous lakes of the Chilean lakes district in the central part of the ecoregion were originally glacial valleys, while the southern part of the region has many glacier-carvedfjord s.To the north the Valdivian forests give way to the
Mediterranean forests, woodlands, and shrub of theChilean Matorral ecoregion. Some few Valdivian forests grows in northern Chile such as that one inBosque de Fray Jorge National Park as remains of thelast glacial maximum . To the south lies theMagellanic subpolar forests ecoregion. The temperate Valdivian, Matorral, and Magellanic ecoregions are isolated from the subtropical and tropical forests of northern South America by theAtacama desert north of the Matorral, the Andes mountains, and dry rain-shadow Argentine grasslands east of the Andes. As a result, the temperate forest regions have evolved in relative isolation, with a high degree ofendemic species.Climate
The Andean Cordillera intercepts moist westerly winds along the Pacific coast during winter and summer months; these winds cool as they ascend the mountains, creating heavy rainfall on the mountains' west-facing slopes. The northward-flowing oceanic Humboldt Current creates humid and foggy conditions near the coast. The tree line is at about 2,400 m in the northern part of the ecoregion (35° S), and descends to 1,000 m in the south of the Valdivian region. In the
summer the temperature can climb to 62 degreesFahrenheit (16.5 °C), while during winter the temperature can drop below 45 °F (7 °C). [Di Castri F di & E. Hajek 1976. [http://svsch.ceachile.cl/biblioteca_archivos/Bioclimatologia%20de%20Chile.pdf "Bioclimatología de Chile" 163 pages with english summary] ]Flora
The Valdivian temperate rain forests are
temperate broadleaf and mixed forests . The Valdivian and Magellanic temperate rainforests are the onlytemperate rain forest s inSouth America and one of a small number of temperate rain forests in the world. Together they are the second largest in the world, after thePacific temperate rain forests ofNorth America (which stretches from Alaska to northern California). The Valdivian forests are a refuge for theAntarctic flora , and share many plant families with the temperate rainforests ofNew Zealand ,Tasmania , andAustralia . Fully half the species of woody plants are endemic to this ecoregion."
Chusquea quila " is bambu that grows in archs in humid areas below 500 m, where "Chusquea coleou " becomes more dominant. "Chusquea quila" can form pure stands called Quilantales. Very few plants can grow under this species.Forests ecosystems
There are five main types of forest ecosystems in the Valdivian ecoregion. At the northern end of the ecoregion are deciduous forests, dominated by two deciduous species of
southern beech : rauli ("Nothofagus alpina ") and roble ("N. obliqua"); this is a transitional zone to the Mediterranean-climate forests to the north.The second type are the Valdivian laurel-leaved forests, characterized by a variety of broadleaf evergreen trees, including "
Laureliopsis philippiana ", "Aextoxicon punctatum", "Eucryphia cordifolia ", "Caldcluvia paniculata ", and "Weinmannia trichosperma ", with an understory of "Myrceugenia planipes", the arrayán ("Luma apiculata") and other plants.The third forest type is the Patagonian Andean forests, which are distributed at higher elevations along the Andes mountain front, and are dominated by evergreen
conifer s, including the Pehuén or monkey-puzzle ("Araucaria araucana ") and the Alerce ("Fitzroya cupressoides"). The alerce looks like aGiant sequoia and is a rival in longevity to theBristlecone pine , some with growth rings recording 3,625 years of local weather cycles. Closer to the treeline the conifers give way to Andean scrublands of deciduous "Nothofagus ".The fourth type is the Northern Patagonian forests, which dominate the southern half of the ecoregion, with evergreen species such as the broadleaf "
Nothofagus dombeyi " and "Drimys winteri " and the coniferous podocarps, including "Podocarpus nubigenus " (Podocarpus nubigena).The last type are the evergreen forests and bogs, which consist of evergreen forests of "
Nothofagus betuloides " and bogs of "Sphagnum "moss , which are also characteristic of theMagellanic subpolar forests ecoregion to the south.Fauna
Some of the threatened mammals of the Valdivian forests include the
Monito del Monte "(Dromiciops gliroides)", an arborealmarsupial , the Southern Pudú "(Pudu pudu)" the world's smallestdeer , and theKodkod "(Leopardus guigna)", South America's smallestcat . Since the beginning of the 20th century there are also non-nativeWild boar s living in the Valdivian forests.Conservation
The Valdivian forests include stands of huge trees, especially "Nothofagus" and "Fitzroya", which can live to a great age. These magnificent rainforests are endangered by extensive logging and their replacement by fast-growing
pine s andeucalyptus , which are more sought-after by the pulp and paper industry. The native trees that are cleared to make way for these monocultures are often exported aswoodchip s to Japan. The Valdivian forests have been reduced by half already. <---Forest and riparian habitat in the region is also threatened by theHidroAysen project , a proposed hydroelectric dam and power transmission development along theRio Baker andRio Pascua --citation needed->. A start at conservation was made in November 2003 when a consortium of conservation groups, both local and international, bought at auction of a bankrupt logging firm 147,500 acres (600 km²) of biologically rich rainforest in the Valdivian Coastal Range. Gianni Lopez, Executive Director ofCONAMA , Chile’s national environmental agency remarked, "Ten years ago the existence of protected areas not owned by the government was unthinkable."List of protected areas of Valdivian temperate rain forest
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Los Alerces National Park (Argentina)
*Los Arrayanes National Park (Argentina)
*Bosque de Fray Jorge National Park
*Huerquehue National Park
*Huilo-Huilo Biological Reserve
*Lago Puelo National Park (Argentina)
*Lanín National Park (Argentina)
*Nahuel Huapí National Park (Argentina)
*Oncol Park
*Pumalín Park
*Puyehue National Park
*Queulat National Park
*Valdivian Coastal Reserve
*Valdivia National Reserve
*Villarrica National Park External links
* [http://nature.org/wherewework/southamerica/chile/features/ Explore the Valdivian Coastal Reserve] -- delve deep into the rainforest with a personal tour from
The Nature Conservancy
* [http://www.atacamaphoto.com/lake-district/lake-district-4.htm Photos of the Valdivian Rainforest]
* [http://www.worldwildlife.org/wildworld/profiles/terrestrial/nt/nt0404_full.html Valdivian temperate forests scientific report (World Wildlife Fund)]
* [http://www.panda.org/about_wwf/where_we_work/ecoregions/valdivian_temperate_rainforests.cfm Valdivian temperate rain forests/Juan Fernandez Islands (World Wildlife Fund)]
* [http://www.planetavivo.org/english/ResearchPrograms/ChiloeForest/SlideShows/DiapoMartin/DiapoMartin1.html Research at Chiloé Rain Forest]
* [http://www.chilebosque.cl Flora species from Valdivian rain forests]ee also
*
Chilean matorral
*Magellanic subpolar forests Notes and references
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