Figure 3: Iron-bound organic carbon (Fe-OC; a) and total organic carbon (b) in sediment were significantly higher under oxic compared to hypoxic conditions in Falling Creek Reservoir (FCR) during the summer stratified period of 2019. Fe-OC as a percentage of sediment OC did not differ significantly between hypoxic and oxic conditions. Here, oxic and hypoxic conditions are classified based upon mean oxygen levels during the two weeks preceding sampling (Figure S3). Statistical significance of differences between oxic and hypoxic periods is indicated using asterisks: * indicates p < 0.05, *** indicates p < 0.001.