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(a) N2 fixation, (b) C fixation and (c) O2 evolution in free‐floating trichomes and colonies of Trichodesmium measured under different O2 concentrations in the bulk medium over the duration of the light phase (12 h). Low O2, 24 ± 11 μmol l−1; ambient O2, 238 ± 13 μmol l−1; high O2, 475 ± 32 μmol l−1. n ≥ 3, except for trichomes at low O2 with n = 2 in (a, b), and colonies at high O2 with n = 2 in (c). Error bars indicate SD.
