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The globally distributed diazotroph  Trichodesmium  contributes importantly to nitrogen inputs in the oligotrophic oceans. Sites of dissolved organic matter (DOM) accumulation could promote the mixotrophic nutrition of  Trichodesmium  when inorganic nutrients are scarce. Nano-scale secondary ion mass spectrometry (nanoSIMS) analyses of individual trichomes sampled in the South Pacific Ocean, showed significant  13 C-enrichments after incubation with either  13 C-labeled carbohydrates or amino acids. These results suggest that DOM could be directly taken up by  Trichodesmium  or primarily consumed by heterotrophic epibiont bacteria that ultimately transfer reduced DOM compounds to their host trichomes. Although the addition of carbohydrates or amino acids did not significantly affect bulk N 2  fixation rates, N 2  fixation was enhanced by amino acids in individual colonies of  Trichodesmium.  We discuss the ecological advantages of DOM use by  Trichodesmium  as an alternative to autotrophic nutrition in oligotrophic open ocean waters.

Dissolved organic matter uptake by Trichodesmium in the Southwest Pacific