Abstract
Extra-Andean Patagonia is a large xeric biome that extends between the Argentinean Provinces of Mendoza and Tierra del Fuego. The Natural Protected Area “Península Valdés” (ANP-PV), the largest conservation unit for arid ecosystems in Argentina, is located in the northeastern zone of this biome. It is a wide plateau, extending 4,000 km2 in the NE of Chubut Province (42º05’–42º53’S; 63º35’–65º04’W), and it has been included in the UNESCO’s World Heritage List since 1999. According to its vegetation and physiognomy, Península Valdés is included in the Patagonian Biogeographical Province, Chubut Subdistrict (Soriano, 1956), and also belongs to the Monte Biogeographical Province (Cabrera & Willink, 1973), whereas according to Morrone (2001a, 2001b) and based on its fauna, it is part of the Central Patagonic Province of the Andean Region. Annual rainfall in ANP-PV ranges from 175 to 225 mm, and annual mean temperature is higher than 13ºC (Coronato, 1994), with widely ranging diurnal variations, from 10 to 51ºC in summer.
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