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The document analyzes the vulnerability of agricultural communities in three Andean river basins (Mendoza, Argentina; Choquecota, Bolivia; and Elqui, Chile) to climate variability. It finds that adaptation capacity is critically limited by poor institutional coordination, lack of water data, and absence of early warning systems. While stronger state frameworks in Argentina and Chile benefit large commercial producers, poor populations remain highly vulnerable. In Bolivia, the lack of state presence makes traditional farmers particularly susceptible, relying primarily on traditional knowledge for adaptation.