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Arid and semi-arid ecosystems in South America include several different habitats, such as the Peruvian and Atacama Deserts of the Pacific Coast, Monte Desert of central Argentina, Patagonian steppes, Chaco xeric woodlands, Andean Puna, and Brazilian Cerrado and Caatinga. All these areas belong to two biotic tracks, one stretching from Patagonia to the Peruvian coastal desert province, at approximately...
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