@article{fdi:010080463,
  title = {{P}otential bioavailability of organic matter from atmospheric particles to marine heterotrophic bacteria},
  author = {{D}jaoudi, {K}. and {V}an {W}ambeke, {F}. and {B}arani, {A}. and {B}hairy, {N}. and {C}hevaillier, {S}. and {D}esboeufs, {K}. and {N}unige, {S}. and {L}abiadh, {M}. and des {T}ureaux, {T}. {H}. and {L}efevre, {D}. and {N}ouara, {A}. and {P}anagiotopoulos, {C}. and {T}edetti, {M}arc and {P}ulido-{V}illena, {E}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he surface ocean receives important amounts of organic carbon from atmospheric deposition. {T}he degree of bioavailability of this source of organic carbon will determine its impact on the marine carbon cycle. {I}n this study, the potential availability of dissolved organic carbon ({DOC}) leached from both desert dust and anthropogenic aerosols to marine heterotrophic bacteria was investigated. {T}he experimental design was based on 16 d incubations, in the dark, of a marine bacterial inoculum into artificial seawater amended with water-soluble {S}aharan dust ({D} treatment) and anthropogenic ({A} treatment) aerosols, so that the initial {DOC} concentration was similar between treatments. {G}lucose-amended ({G}) and non-amended (control) treatments were run in parallel. {O}ver the incubation period, an increase in bacterial abundance ({BA}) and bacterial production ({BP}) was observed first in the {G} treatment, followed then by the {D} and finally {A} treatments, with bacterial growth rates significantly higher in the {G} and {D} treatments than the {A} treatment. {F}ollowing this growth, maxima of {BP} reached were similar in the {D} (879 +/- 64 ng {C} {L}-1 h(-1); n = 3) and {G} (648 +/- 156 ng {C} {L}-1 h(-1); n = 3) treatments and were significantly higher than in the {A} treatment (124 ng {C} {L}-1 h(-1); n = 2). {T}he {DOC} consumed over the incubation period was similar in the {A} (9 mu {M}; n = 2) and {D} (9 +/- 2 mu {M}; n = 3) treatments and was significantly lower than in the {G} treatment (22 +/- 3 mu {M}; n = 3). {N}evertheless, the bacterial growth efficiency ({BGE}) in the {D} treatment (14.2 +/- 5.5 %; n = 3) compared well with the {G} treatment (7.6 +/- 2 %; n = 3), suggesting that the metabolic use of the labile {DOC} fraction in both conditions was energetically equivalent. {I}n contrast, the {BGE} in the {A} treatment was lower (1.7 %; n = 2), suggesting that most of the used labile {DOC} was catabolized. {T}he results obtained in this study highlight the potential of aerosol organic matter to sustain the metabolism of marine heterotrophs and stress the need to include this external source of organic carbon in biogeochemical models for a better constraining of the carbon budget.},
  keywords = {{FRANCE} ; {TUNISIE} ; {MEDITERRANEE} ; {MARSEILLE} ; {MEDENINE} ; {SAHARA}},
  booktitle = {},
  journal = {{B}iogeosciences},
  volume = {17},
  numero = {24},
  pages = {6271--6285},
  ISSN = {1726-4170},
  year = {2020},
  DOI = {10.5194/bg-17-6271-2020},
  URL = {https://www.documentation.ird.fr/hor/fdi:010080463},
}