Location and General Description
The Central Andean Puna, despite its characteristic dryness and because it still maintains nearly unaltered blocks of habitat, represents an important area for the conservation of endemic species of both flora and fauna.
Located in South America in southwestern Peru and northwestern Bolivia, it occupies an area of 140,960 km2 and lies within the altitudinal range between 3200 and 6600 m. ASL. (Roca R. 1996). Its climate varies from temperate to cold, it is dry with an average temperature between <0 a 15ºC. Precipitation varies between 250 and 500 mm per year (Pulgar Vidal, 1967). This ecoregion rests on formations of volcanic origin subsequent to the formation of the Andes (about 6-8 million years ago). While the western range consists of sedimentary rocks from the Mesozoic and Cenozoic, the eastern range with various folds and faults consists of metamorphic rocks from the Paleozoic. There are also gray limestone and fossil deposits like those of Sicuani, from the marine incursion of the Jurassic, as well as diorites and granites of Andean batholiths from the Cretacean. Volcanic soils associated with soils of varied lithology are notable (Rodríguez 1996).
The vegetation is characterized by being notably drier than in the rest of the puna. It consists primarily of grasslands made up of different types of grasses primarily of the genera Calamagrostis, Agrostis and Festuca. There are also grasslands with wet formations like bofedales, peat bogs and some reed beds. Characteristic formations include the tolares, consisting primarily of tola (Parasthrephia lepidophylla), and the cangllares, dominated by the canglla (Margyricarpus sp.), both small bushy species. As in the wet puna, there are yaretales (Azorella yarita) and rodales of Puya raimondi, a species that has the largest spike in the world. There are also some relicts of montane forests of native species like the queñoa (Polylepis spp.) and colle (Buddleia sp.) and chachacomo (Escallonia sp.) trees can be found at lower altitudes (Ferreyra 1988; Killeen1993).
The characteristic aridity and limited oxygen associated with strong natural disturbances like droughts and frosts have generally limited the development of life but have favored the establishment of those species that have been able to adapt to these cold conditions where resources are scarce. Thus the species that inhabit the ecoregion have interesting adaptations like the shape of their leaves, very slow growth, stunted forms and high resin content. In the case of fauna, herbivores have strong incisors that allow them to feed on the hardest plants with silicon content and also have special skins or plumage (as applicable) that allow them to tolerate low temperatures and strong winds. Some of the endemisms in the ecoregion are the supu-tola (Diplostephium tovari) and the mullu-mullu (Ribes brachybotrys) in terms of vegetation; fauna include the suri (Pterocnemia pennata) and the Punomys lemminus (a rodent). The diversity of mammals, particularly rodents, is notable and increases going from north to south, evidence of a latitudinal effect produced by the various rivers that have acted as barriers to dispersion (Rodríguez 1996).
The most representative fauna in this ecoregion, although not exclusive, are vicuña (Vicugna vicugna), guanaco (Lama guanicoe), chinchilla (Chinchilla brevicaudata) and vizcacha (Lagidium sp.). Threatened bird species include Cinclodes aricomae, Conirostrum tamarugense, flamenco de James (Phoenicopterus jamesi), and gallareta gigante (Fulica gigantea).
This ecoregion faces increasing mining activity that is leading to the destruction of its scarce plant cover as well as the contamination of some bodies of water and the soil. In addition, this region has a large number of population centers and highways that cross the Andes, leading to a decline in natural habitat and growing pressures on the existing fauna. Fortunately, a portion of these habitats is represented within some existing protected natural areas and most plant formations are included in these areas. However, there are still some information gaps, particularly in the case of birds, and there are some priority areas to be preserved.
Types and Severity of Threats
Justification of Ecoregion Delineation
This puna ecoregion of the central Andes is characterized by an intermediate climate and a number of endemic species. In Peru, our linework follows the Instituto Geográfico Nacional (1987), however we distinguish this ecoregion from both wet and dry puna ecoregions based on the classifications scheme of UNESCO (1980), from which we lumped "Andean caespitose herbaceous vegetation of varied coverage with dwarf shrubs (puna)"and "Andean degraded caespitose herrbaceous vegetation with dwarf shrubs". In Chile we also followed the aformentioned UNESCO (1980) classification scheme. In Bolivia our linework follows Ribera et al. (1994), who classifies this region as "semi-humid puna prairie". In Argentina we followed Daniele and Natenzon (1994), who classify this region as "monte and thistles of the prepuna" for the eastern delineation, and UNESCO (1980), following the same classification mentioned above. Reference was also made to Morello (1968), and Carbrera (1976).
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Prepared by: Juan Carlos Riveros Salcedo
Reviewed by: In process