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O2 concentrations in the bulk medium of Trichodesmium cultures incubated in roller tanks, monitored in three replicate vials (a–c). Dominant morphology (free‐floating trichomes or colonies) is indicated above each panel. Note that total biomass differed between vials and changed over time. Dashed lines indicate O2 concentration at air saturation, and grey shaded areas indicate dark phases (that is, night‐time).
