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Damming rivers changes sediment and nutrient cycles downstream of a dam in many direct and indirect ways. The Iron Gates I reservoir on the Yugoslavian-Romanian border is the largest impoundment by volume on the Danube River holding 3.2 billion m3 of water. Silica retention within the reservoir in the form of diatom frustules was postulated to be as high as 600 kt year−1 in previous studies using...