Foreward.- Introduction.- Effects of Multiple Stressors Associated with Land-use Practices in the Percy Corintos Basin (Northwest Chubut): An Ecological Assessment.- The Manso River Drainage System in the Northern Patagonian Andes: Hydrological, Hydrochemical and Nutrient Dynamics.- Geothermal Influence on the Hydrochemistry of Surface Streams in Patagonia Neuquina.- Hydrogeochemistry of an Acid River and Lake Related to an Active Volcano. The Case of Study: Agrio River - Copahue Volcano in Patagonia, Argentina.- Negro River Environmental Assessment.- Patagonia's Chubut River: Overview of the Main Hydrological and Geochemical Features.- Hydrochemical Characteristics of Mid-Low Sections of North Patagonia Rivers, Argentina.- Hydrochemistry of Patagonian Wet Meadows (mallines) Under Different Geological Frames.- The Main Hydrological Features of Patagonia’s Santa Cruz River: An Updated Assessment.- The Role of Sediments andPhosphorus in the Evaluation of Water Resources Quality in Patagonia.- A Hydrological and Biogeochemical Appraisal of Patagonia’s Río Gallegos.- Vertical Electrical Sounding Applied to Hydrolithological Interpretations in the Fuegian Steppe, Argentina.- Water Quality Assessment in Urban Watersheds of Tierra del Fuego: A Perspective from the Integrated Water Resources Management.- Disturbances in Freshwater Environments of Patagonia: A Review.- Glossary.