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Seasonal variations in hydrology and Si cycling in the Nile Basin were investigated using stable-isotope (H, O, and Si) compositions and dissolved Si (DSi) concentrations of surface waters, as a basis for interpreting lacustrine diatom sequences. δ 18 O ranged from −4.7 to +8.0‰ in the wet season and +0.6 to +8.8‰ in the dry season (through 2009–2011). Higher δ 18 O values during the...