Efficient microbial sequestration of organic nitrogen in the eastern Indian Ocean
Rattachement africain : cn. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
The formation of recalcitrant Dissolved Organic Matter (DOM) pools in the ocean has been a longstanding challenge due to the chemical complexity of DOM. Linking nitrogen sequestration and microbial reworking via the production of recalcitrant Dissolved Organic Nitrogen (DON) molecules remains elusive. Here, we characterized intricate molecular composition of DOM using FT-ICR-MS, with a particular emphasis on DON, across three representative regions in the tropical eastern Indian Ocean. Our findings demonstrated the microbial origin of DON in epipelagic waters, with ammonia-oxidizing archaea exerting important control on the enrichment of peptide-like compounds. Microbial respiration was identified as a key driver of DOM transformation throughout the water column. This process enhanced the recalcitrance of DOM and DON by generating molecules with high levels of unsaturation and oxidation, characterized by low bioavailability. These effects were most pronounced in the equatorial region, which demonstrated an exceptional capacity to accumulate nitrogen-rich compounds through microbial processing, thereby facilitating to long-term nitrogen sequestration. Furthermore, we provided a valuable dataset representing microbially derived recalcitrant DON. Our study highlights that a small fraction of DOM with comparatively higher bioavailability is selectively preserved, though the majority of DON persists in the deep ocean due to its recalcitrant nature. This work provides novel molecular-level insights into microbially derived recalcitrant DON molecules, and holds significant implications for the detailed interpretation of global nitrogen sequestration.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Efficient microbial sequestration of organic nitrogen in the eastern Indian Ocean
- Date Crossref
- 18/03/2025
- Éditeur
- Copernicus GmbH
- Type
- posted-content
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
-
Shanghai Estuarine & Coastal Science Research Center pays non établi dans la noticeStructure de recherche
-
East China Normal University State Key Laboratory of Estuarine and Coastal Research pays non établi dans la noticeUniversité ou école supérieure
-
South China Botanical Garden pays non établi dans la noticeStructure de recherche
-
Shanghai Jiao Tong University pays non établi dans la noticeUniversité ou école supérieure
-
Shanghai Ocean University pays non établi dans la noticeUniversité ou école supérieure
-
Chinese Academy of Sciences South China Botanical Garden pays non établi dans la noticeStructure de recherche
-
School of Oceanography pays non établi dans la noticeUniversité ou école supérieure
Shanghai Estuarine & Coastal Science Research Center, State Key Laboratory of Estuarine and Coastal Research — East China Normal University et South China Botanical Garden, avec 4 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.