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Article Dans Une Revue Limnology and Oceanography Letters Année : 2022

Phosphorus limitation determines the quality of dissolved organic matter released by marine heterotrophic prokaryotes

Résumé

Marine heterotrophic prokaryotes (HP) generate copious amounts of dissolved organic matter (DOM). Some of this DOM is recalcitrant to biological degradation and can persist in the ocean for millennia. This carbon sequestration mechanism is called the microbial carbon pump (MCP). The factors controlling the strength of the MCP are still poorly understood. Phosphorus (P) limitation is a common condition in the ocean that can influence HP growth and metabolism. We addressed here the question of whether P-limitation affects the quantity and quality of DOM released by HP. We found no effect of P-limitation on HP-derived DOM net quantity. However, using fluorescence spectroscopy, we demonstrated that P-limitation altered DOM composition with an increase in humic-like compounds. Our study provides experimental evidence that P availability plays an important role in shaping the chemical composition of HP-derived DOM. Our results have implications for the fate of HP-derived DOM in the ocean, suggesting that P-limitation is a key driver of the MCP.
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Dates et versions

hal-03860797 , version 1 (18-11-2022)

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Nawal Bouchachi, Ingrid Obernosterer, Barbara Marie, Olivier Crispi, Eva Ortega-Retuerta. Phosphorus limitation determines the quality of dissolved organic matter released by marine heterotrophic prokaryotes. Limnology and Oceanography Letters, inPress, ⟨10.1002/lol2.10287⟩. ⟨hal-03860797⟩
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