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Dissolved organic matter uptake by Trichodesmium in the Southwest Pacific

Mar Benavides; Hugo Berthelot; Solange Duhamel; Patrick Raimbault; Sophie Bonnet

Title:
Dissolved organic matter uptake by Trichodesmium in the Southwest Pacific
Author(s):
Benavides, Mar
Berthelot, Hugo
Duhamel, Solange
Raimbault, Patrick
Bonnet, Sophie
Date:
Type:
Articles
Department(s):
Lamont-Doherty Earth Observatory
Volume:
7
Persistent URL:
Book/Journal Title:
Scientific Reports
Geographic Area:
South Pacific Ocean
Abstract:
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 13C-enrichments after incubation with either 13C-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 N2 fixation rates, N2 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.
Subject(s):
Microbiology
Microorganisms
Trichodesmium
Seawater--Organic compound content
Publisher DOI:
https://doi.org/10.1038/srep41315
Item views
15
Metadata:
text | xml
Suggested Citation:
Mar Benavides, Hugo Berthelot, Solange Duhamel, Patrick Raimbault, Sophie Bonnet, , Dissolved organic matter uptake by Trichodesmium in the Southwest Pacific, Columbia University Academic Commons, .

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