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| Andean Patagonian steppe | |
|---|---|
| Name | Andean Patagonian steppe |
| Biogeographic realm | Neotropical |
| Biome | Temperate grasslands, savannas, and shrublands |
| Countries | Argentina; Chile |
Andean Patagonian steppe is a high-elevation temperate shrubland and grassland region along the eastern slopes of the Andes in southern South America, spanning parts of Argentina and Chile. This montane steppe forms a transition between the Patagonian Desert and the Andean alpine zones influenced by the Southern Cone climate systems and the Roaring Forties westerlies. It is notable for its unique assemblages of grasses, shrubs, and endemic vertebrates shaped by Pleistocene glaciations, Andean orogeny, and Holocene human activities linked to regional institutions and national parks.
The steppe occupies a longitudinal band facing the Patagonian Andes and abuts the Argentine Patagonia plateaus, the Chilean Lake District foothills, and the eastern margins of the Valdivian temperate rain forest in places near Futaleufú River drainages and the Falkland Islands-proximate continental shelf influences. Major hydrographic features include the upper basins of the Río Negro (Argentina), Limay River, Neuquén River, and tributaries feeding the Atlantic Ocean via Golfo San Matías, while cordilleran catchments flow toward the Pacific Ocean through fjords and the Bío Bío River system farther north. The region is contiguous with protected areas such as Los Glaciares National Park, Nahuel Huapi National Park, Alerce Andino National Park, and private reserves associated with the Patagonian Icefields front. Important cities and towns on the steppe margin include Bariloche, San Carlos de Bariloche, Bariloche National Airport hinterlands, San Martín de los Andes, Neuquén (city), and Pico Truncado serving economic and logistical links to ports like Bahía Blanca and airports like Comodoro Rivadavia Airport.
Climate is strongly influenced by the Andes Mountains, the Pacific Ocean, and the latitudinal position within the Roaring Forties, producing steep east–west precipitation gradients, orographic rainshadow effects, and sharp seasonal variability associated with the Southern Annular Mode and El Niño–Southern Oscillation. Meteorological regimes range from cold semi-arid to cold temperate, with annual precipitation decreasing eastward from the windward western slopes and mean annual temperatures moderated by altitude, as recorded in observatories such as Bariloche Observatory and stations operated by Servicio Meteorológico Nacional (Argentina). Wind systems include persistent westerlies amplified by mountain lee waves studied by researchers affiliated with CONICET and Universidad Nacional del Comahue, and synoptic extremes linked to extratropical cyclones that pass near Tierra del Fuego and the southern Pacific Storm Track.
Vegetation is dominated by hardy shrubs, tussock grasses, and cushion plants adapted to cold, wind, and low moisture, with notable taxa represented in botanical collections at institutions such as the Museo Argentino de Ciencias Naturales and herbaria at Universidad de Chile. Characteristic genera and families include members of Nassauvia, Perezia, Senecio, Festuca, Stipa, Azorella, and Acaena, with alpine cushion communities comparable to those documented in the Andean páramo and Patagonian steppe literature. Phytogeographic mosaics create ecotones with Magellanic moorland and relict woodlands of Nothofagus pumilio and Nothofagus antarctica near riparian corridors and glacial cirques catalogued by researchers from CONAF and the National Parks Administration (Argentina). Endemic plant species have been described by botanists associated with Royal Botanic Gardens, Kew collaborations and regional taxonomic surveys.
Faunal assemblages include large mammals, mesopredators, and avifauna adapted to open, cold environments; emblematic species encompass the Guanaco, Patagonian mara, Andean fox (also called culpeo), and smaller rodents like Chinchilla lanigera relatives and Calomys spp. Birds include raptors such as the Black-chested Buzzard-Eagle, ground-dwelling species like the Darwin's rhea, and migratory shorebirds using steppe wetlands along flyways linked to East Pacific Flyway studies. Amphibians and reptiles occur in riparian microhabitats, with herpetofauna documented by museums including Museo de La Plata and universities such as Universidad Nacional de La Plata. Trophic dynamics feature grazing pressure from domestic sheep introduced during 19th-century colonization associated with enterprises like the Argentine Sociedad Rural and predator interactions with puma populations monitored by conservation NGOs such as Wildlife Conservation Society and local chapters of Fundación Flora y Fauna Argentina.
Soils are typically coarse, poorly developed Entisols and Aridisols with cryoturbation, loess deposits, and volcanic ash layers derived from Andean eruptions recorded in stratigraphic studies by the Geological and Mining Service of Chile and Instituto de Geología y Recursos Minerales (Argentina). Periglacial landforms, glacial moraine complexes from the Last Glacial Maximum, and fluvial terraces shape a hummocky terrain punctuated by interdunal loess and lag gravels; geomorphologists from institutions like CONICET and Universidad de Buenos Aires have mapped these features alongside seismic studies associated with the Nazca Plate–South American Plate convergent margin. Soil salinity and alkaline pans occur in closed basins similar to features studied in the Altiplano.
Human presence traces to hunter-gatherer adaptations by groups historically identified in archaeological literature as the Tehuelche and Mapuche peoples, who engaged in seasonal mobility, guanaco hunting, and social networks documented in ethnohistorical archives at libraries such as the Biblioteca Nacional de Chile and Biblioteca Nacional de la República Argentina. Colonial and postcolonial histories involve expeditions by figures linked to the Conquest of the Desert, railway construction funded by British capital associated with companies registered in London, and land tenure changes codified in laws debated in the Argentine Congress. Ethnographers from Smithsonian Institution collaborations and scholars at University of Cambridge have published on cultural persistence, artisanal practices, and toponymy in steppe communities.
Land use is dominated by extensive pastoralism—principally sheep farming and introduced cattle ranching—supplemented by energy extraction activities including exploration near basins exploited by firms linked to YPF and multinational contractors, and by mining claims overseen by regional secretariats. Tourism anchored by gateways like El Chaltén and adventure operators tied to International Union for Conservation of Nature partnerships brings economic activity to buffer zones of protected areas such as Nahuel Huapi National Park and Tierra del Fuego National Park, while conservation initiatives involve NGOs including WWF and regional agencies like Corporación Nacional Forestal (CONAF) and interdisciplinary research by universities such as Universidad Nacional de Río Negro. Contemporary policy debates in provincial legislatures and international forums address invasive species control, overgrazing, water rights adjudicated in courts such as the Supreme Court of Argentina, and sustainable development models promoted by agencies like the United Nations Development Programme.
Category:Biomes of South America