This Review article, written by Luisa V. Giles, Prabjit Barn, Nino Künzli, Isabelle Romieu, Murray A. Mittleman, Stephan van Eeden, Ryan Allen, Chris Carlsten, Dave Stieb,...
Central Andean dry punaLast Updated on 2014-03-13 21:47:30This ecoregion is a very dry, high elevation montane grassland and herbaceous community of the southern high Andes, extending through western Bolivia and northern Chile and Argentina. The vegetation is characteristically tropical alpine herbs with dwarf shrubs, and occurs above 3,500 meters (m) between the tree-line and the permanent snow-line. Dry puna is distinguished from other types of puna by its annual rainfall, or lack of rainfall. This ecoregion receives less than 400 millimeters (mm) of rainfall each year, and is very seasonal with an eight-month long dry season. The Central Andean Dry Puna is a unique ecoregion with flora and fauna highly adapted to the extreme temperatures and altitudes. The region contains forests of Polylepis, the only arborescent genus that occurs naturally at high elevations. Various species of Andean camelids are also found in this... More »
Patagonian grasslandsLast Updated on 2014-03-13 15:17:46
The Patagonian grasslands ecoregion extends from near the tip of the southern cone in Argentina, northwards across eastern Tierra del Fuego, then extends just north of the Straits of Magellan to the Rio Gallegos. The Falkland Islands are also included in this ecoregion. Habitats in this ecoregion include tundra grasslands in the northern portion, high latitude Andean meadows in the central portion, deciduous thickets along the southern extremes, and swamp forests on the Falkland Islands.
Much of this region in southern Argentina and Chile has been ecologically altered due to extensive grazing of livestock introduced by Europeans in the 1800s. Certain coastal portions of this ecoregion are prolific breeding grounds for penguins such as the Magellanic Penguin.
The Patagonian grasslands are located at the bottom tip of South America. The region extends from the Santa Cruz... More »
Humid PampasLast Updated on 2014-03-13 15:13:49The Humid Pampas ecoregion occupy one of the most human populated areas in Argentina. The ecoregion consists of the plains, many rivers, and lagoons. The natural vegetation in the area is composed of grasslands and xeric woodland. There are various endemic animals that are threatened by habitat destruction and degradation. The ecoregion is considered endangered and is regarded as a high priority conservation area at the regional scale.
The Humid Pampas occupy the plains in the east of Argentina, taking up most of the province of Buenos Aires. Horizontal plains and very soft undulations with low peaks that emerge like islands characterize the relief of this area. There are a few slow moving, undulating rivers and many lagoons with fresh and salt water. The pampas plains originated in packed sediment from a large sinking tectonic pit that extends to the Chaco. The soils are gray or... More »
Argentine EspinalLast Updated on 2014-03-13 15:09:48This ecoregion is described as an "espinal", literally meaning a thorny deciduous shrubland forest. The occurrence of this vegetation type is extensive from the central basin of the Paraná River (west of the flooded savannas) westward to the Córdoba Mountains. This region has become developed and cultivated and is threatened by agricultural expansion.
This Argentine espinal ecoregion is located in central Argentina extending from central Santa Fe through the province of Córdoba to the north of San Luis. In the northern section, the climate is warm and wet with summer rains. As happens with other phytogeographic provinces, it has great temperature variations and high average precipitation. It is a mostly flat plain with low hilly areas. Soils are loessoid or sandy.
The vegetation is characteristic of deciduous xerophytic forests, palm groves, grassy... More »
Humid ChacoLast Updated on 2014-03-13 15:05:08This region is a mosaic of ecosystems, combining woods with savanna. In this mosaic, various species of trees, shrubs, and coarse grass develop and are associated with numerous species of fauna adapted to this diverse environment. Poaching and exploitation of plants are the main threats to the natural habitat in this ecoregion, which has been considerably altered due to cattle raising.
The Chaco Humedo ecoregion is located in northeastern Argentina, the center of Paraguay, and small areas in southwestern Brazil. The region slopes gently towards the east and overlooks areas full of depressions. The soils are generally sedimentary, originating from river flows and composed of fine materials. Sometimes there are impermeable soil layers that cause the formation of bogs. The average annual temperature drops from north to south, from 23°C along the Paraguay border, to... More »
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