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In November 2004, Valdivia Cellulose Pulp Plant started operating in San Pedro de la Mariquina, 56 kilometers north-west of Valdivia in southern Chile. A few months later a decrease in the population of the Black Necked Swans (Cygnus melancoryphus) in the Carlos Anwandter Sanctuary, near the discharging point of the mill, was discovered. The aim of the thesis was to evaluate three alternative disc
