Figure 6: Varied oxygen regimes led to differences in water chemistry among experimental microcosm treatments. Metrics assessed include dissolved oxygen (DO), dissolved organic carbon (DOC), total iron (Fe), and dissolved Fe concentrations in microcosms that were sampled destructively over the course of 34 days. Vertical lines indicate when oxygen conditions were switched, creating the oxic-to-hypoxic and hypoxic-to-oxic treatments.