@article{fdi:010096012,
  title = {{L}ong term decline of the planktonic biomass in a hotspot of nitrogen fixation},
  author = {{F}umenia, {A}. and {L}oisel, {H}. and {K}arl, {D}. {M}. and {V}antrepotte, {V}incent and {P}etrenko, {A}. and {B}onnet, {S}ophie and {T}ran-{D}uy, {M}. and {B}retagnon, {M}. and {M}angin, {A}. and {M}outin, {T}.},
  editor = {},
  language = {{ENG}},
  abstract = {{O}ceanic {N}2 fixation by diazotrophic microorganisms is the primary external source of new nitrogen to the surface ocean sustaining net production of organic matter. {S}tudying long-term trends in biomass within {N}2 fixation hotspots is crucial for understanding and predicting the response of {N}2 fixation to global climate change. {H}ere we developed a bio-optical model based on the spectral phytoplankton absorption coefficient derived from satellite ocean color observations to estimate a proxy for particulate organic nitrogen in the western tropical {S}outh {P}acific. {W}e demonstrate the existence of a seasonal new biomass production annually over the past 20 years, likely driven by recurrent {N}2 fixation. {I}mportantly, our results also reveal a gradual decline in biomass within this {N}2 fixation hotspot over the last two decades. {T}his decline indicates that seasonal nitrogen inputs via {N}2 fixation are decreasing. {T}his trend inevitably could lead to a decline in the efficiency of the biological carbon pump, with potential implications for global biogeochemical cycles and climate regulation.},
  keywords = {{PACIFIQUE} {SUD} {OUEST} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{N}ature {C}ommunications},
  volume = {16},
  numero = {1},
  pages = {11697 [12 p.]},
  year = {2025},
  DOI = {10.1038/s41467-025-66743-3},
  URL = {https://www.documentation.ird.fr/hor/fdi:010096012},
}