@article{fdi:010095014,
  title = {{A}ggregation and remineralization of {T}richodesmium unveil potential for ocean carbon sequestration},
  author = {{F}ourquez, {M}. and {A}babou, {F}. {E}. and {C}amps, {M}. and {V}an {W}embeke, {F}. and {G}rosso, {O}. and {B}arani, {A}. and {N}unige, {S}. and {G}uyomarch, {L}. and {L}e {M}oigne, {F}. {A}. {C}. and {B}onnet, {S}ophie},
  editor = {},
  language = {{ENG}},
  abstract = {{R}ecent studies have shown that diazotrophs can form aggregates sinking at velocities up to 400 m d(-1), challenging the long-standing assumption that these organisms are confined to the surface ocean, and suggesting an understimated role in carbon ({C}) sequestration in warm oligotrophic waters. {Y}et, the extent to which their biomass escapes remineralization in the mesopelagic zone remains poorly constrained. {H}ere, we experimentally simulated the aggregation and sinking of the filamentous diazotroph {T}richodesmium erythraeum using roller tanks, following organic matter distribution over a 10-day period-equivalent to a 1000 m descent at a sinking velocity of similar to 100 m d(-1). {O}ur results show that 33% of organic {C} and 36% of {N} remained in the particulate fraction at the end of the experiment, indicating that microbial remineralization was incomplete and relatively proportional. {R}emineralization was most intense during the first 3 to 5 days of descent (0-500 m), after which potential {C} flux declined. {W}e also estimated that a substantial portion of bacterial biomass was incorporated into the aggregates and may contribute to the {C} export, revealing a dual role for bacteria as both recyclers and exporters of organic matter. {G}iven the widespread distribution and high productivity of {T}richodesmium erythraeum in the expanding (sub)tropical ocean, our results highlight the need to include its fate in global biogeochemical models.},
  keywords = {diazotrophs ; organic matter remineralization ; {T}richodesmium erythraeum ; carbon sequestration ; sinking velocity ; aggregation ; biological carbon pump},
  booktitle = {},
  journal = {{ISME} {C}ommunications},
  volume = {5},
  numero = {1},
  pages = {ycaf128 [11 p.]},
  year = {2025},
  DOI = {10.1093/ismeco/ycaf128},
  URL = {https://www.documentation.ird.fr/hor/fdi:010095014},
}