@article{fdi:010085074,
  title = {{E}xamining the interaction between free-living bacteria and iron in the {G}lobal {O}cean},
  author = {{P}ham, {A}. {L}. {D}. and {A}umont, {O}livier and {R}atnarajah, {L}. and {T}agliabue, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{M}arine free-living ({FL}) bacteria play a key role in the cycling of essential biogeochemical elements, including iron ({F}e), during their uptake, transformation and release of organic matter throughout the water column. {S}imilar to phytoplankton, the growth of {FL} bacteria is regulated by nutritive resources such as {F}e, and the low availability of these resources may influence bacterial interactions with phytoplankton, causing knock-on effects for biogeochemical cycling. {Y}et, knowledge of the factors limiting the growth of {FL} bacteria and their role within the {F}e cycle is poorly constrained. {H}ere, we explicitly represent {FL}, carbon-oxidizing bacteria in a three-dimensional global ocean biogeochemistry model to address these questions. {W}e find that although {F}e can emerge as proximally limiting in the tropical {P}acific and in high-latitude regions during summer, the growth of {FL} bacteria is ultimately controlled by the availability of labile dissolved organic carbon over most of the world's oceans. {I}n {F}e-limited regions, {FL} bacterial biomass is sensitive to their {F}e uptake capability in seasonally {F}e-limitation regions and to their minimum {F}e requirements in regions perennially low in {F}e. {F}e consumption by {FL} bacteria is significant in the upper ocean in our model, and their competition with phytoplankton for {F}e affects phytoplankton growth dynamics and can make bacteria become more carbon limited. {T}he impact of {FL} bacteria on the {F}e distribution in the ocean interior is small due to a tight coupling between {F}e uptake and release. {M}oving forward, future work that considers other bacteria groups and different bacterial metabolisms is needed to explore the broader role of bacteria in ocean {F}e cycling. {I}n this context, the global growing' omics data from ocean observing programs can play a crucial role.},
  keywords = {bacteria ; iron ; dissolved organic carbon ; ocean biogeochemistry ; marine ecosystem ; ocean modeling ; {MONDE}},
  booktitle = {},
  journal = {{G}lobal {B}iogeochemical {C}ycles},
  volume = {36},
  numero = {5},
  pages = {e2021{GB}007194 [23 ]},
  ISSN = {0886-6236},
  year = {2022},
  DOI = {10.1029/2021gb007194},
  URL = {https://www.documentation.ird.fr/hor/fdi:010085074},
}