@article{fdi:010070888,
  title = {{C}ryptic oxygen cycling in anoxic marine zones},
  author = {{G}arcia-{R}obledo, {E}. and {P}adilla, {C}. {C}. and {A}ldunate, {M}. and {S}tewart, {F}. {J}. and {U}lloa, {O}. and {P}aulmier, {A}ur{\'e}lien and {G}regori, {G}. and {R}evsbech, {N}. {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{O}xygen availability drives changes in microbial diversity and biogeochemical cycling between the aerobic surface layer and the anaerobic core in nitrite-rich anoxic marine zones ({AMZ}s), which constitute huge oxygen-depleted regions in the tropical oceans. {T}he current paradigm is that primary production and nitrification within the oxic surface layer fuel anaerobic processes in the anoxic core of {AMZ}s, where 30-50% of global marine nitrogen loss takes place. {H}ere we demonstrate that oxygenic photosynthesis in the secondary chlorophyll maximum ({SCM}) releases significant amounts of {O}-2 to the otherwise anoxic environment. {T}he {SCM}, commonly found within {AMZ}s, was dominated by the picocyanobacteria {P}rochlorococcus spp. {F}ree {O}-2 levels in this layer were, however, undetectable by conventional techniques, reflecting a tight coupling between {O}-2 production and consumption by aerobic processes under apparent anoxic conditions. {T}ranscriptomic analysis of the microbial community in the seemingly anoxic {SCM} revealed the enhanced expression of genes for aerobic processes, such as nitrite oxidation. {T}he rates of gross {O}-2 production and carbon fixation in the {SCM} were found to be similar to those reported for nitrite oxidation, as well as for anaerobic dissimilatory nitrate reduction and sulfate reduction, suggesting a significant effect of local oxygenic photosynthesis on {P}acific {AMZ} biogeochemical cycling.},
  keywords = {{P}rochlorococcus ; oxygen minimum zone ; secondary chlorophyll maximum ; metatranscriptomics ; aerobic metabolism ; {PACIFIQUE} {EST} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{P}roceedings of the {N}ational {A}cademy of {S}ciences of the {U}nited {S}tates of {A}merica},
  volume = {114},
  numero = {31},
  pages = {8319--8324},
  ISSN = {0027-8424},
  year = {2017},
  DOI = {10.1073/pnas.1619844114},
  URL = {https://www.documentation.ird.fr/hor/fdi:010070888},
}