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agricultural Agua aquaculture aquifers assessment by-catch Causal chain analysis Central American Central Equatorial Pacific coast coastal areas Colombia concentrations contaminacion contamination Costa Rica Costeras costero countries discharges Eastern Equatorial Pacific economic environmental and socio-economic Equatorial Pacific region Equatorial Pacific sub-system eutrophication fish fisheries Freshwater shortage GIWA global change govemments groundwater Guatemala Gulf of Fonseca Gulf of Nicoya Habitat Honduras implementation increased industry institutional intemational INVEMAR issues Lake Chapala Lempa River living resources mangrove Marine Environment Medio Ambiente microbiological pollution municipal Nicaragua Nino OPS/OMS overexploitation Pacific Colombian sub-system Pacifico Panama pesticides PNUMA policy options population priority concem programmes Recursos result river basins root causes run-off Salvador sectors sediments SEMARNAT shrimp socio-economic impacts Solid wastes sources South Southwest Mexico sub-system species tonnes tourism transboundary Tumaco UNEP Unsustainable exploitation urban Valle del Cauca wastewater treatment water bodies water management water resources Weight average score