FN Archimer Export Format
PT J
TI Potential bioavailability of organic matter from atmospheric particles to marine heterotrophic bacteria
BT 
AF DJAOUDI, Kahina
   VAN WAMBEKE, France
   BARANI, Aude
   BHAIRY, Nagib
   CHEVAILLIER, Servanne
   DESBOEUFS, Karine
   NUNIGE, Sandra
   LABIADH, Mohamed
   DES TUREAUX, Thierry Henry
   LEFEVRE, Dominique
   NOUARA, Amel
   PANAGIOTOPOULOS, Christos
   TEDETTI, Marc
   PULIDO-VILLENA, Elvira
AS 1:1,2;2:1;3:1;4:1;5:5;6:5;7:1;8:3;9:4;10:1;11:1;12:1;13:1;14:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;
C1 Aix Marseille Univ, Univ Toulon, CNRS, IRD,MIO UM 110, F-13288 Marseille, France.
   Univ Arizona, Mol & Cellular Biol, Tucson, AZ 85721 USA.
   IRA Inst Reg Arides Medenine, El Fje4119, Medenine, Tunisia.
   Univ Paris, iEES Paris Inst Ecol & Sci Environm Paris, UMR IRD 242, Univ Paris Est Creteil,Sorbonne Univ,CNRS,INRA, F-93143 Bondy, France.
   Univ Paris, Univ Paris Est Creteil, LISA, Inst Pierre Simon Laplace IPSL,UMR7583, Creteil, France.
C2 UNIV AIX MARSEILLE, FRANCE
   UNIV ARIZONA, USA
   IRA, TUNISIA
   UNIV PARIS, FRANCE
   UNIV PARIS, FRANCE
SI TOULON
SE CNRS
   MIO
IN DOAJ
IF 4.295
TC 10
UR https://archimer.ifremer.fr/doc/00677/78941/81326.pdf
   https://archimer.ifremer.fr/doc/00677/78941/81327.pdf
   https://archimer.ifremer.fr/doc/00677/78941/81328.pdf
   https://archimer.ifremer.fr/doc/00677/78941/81329.pdf
LA English
DT Article
CR PARTICULE LEG1
BO Téthys II
AB The surface ocean receives important amounts of organic carbon from atmospheric deposition. The degree of bioavailability of this source of organic carbon will determine its impact on the marine carbon cycle. In this study, the potential availability of dissolved organic carbon (DOC) leached from both desert dust and anthropogenic aerosols to marine heterotrophic bacteria was investigated. The experimental design was based on 16 d incubations, in the dark, of a marine bacterial inoculum into artificial seawater amended with water-soluble Saharan dust (D treatment) and anthropogenic (A treatment) aerosols, so that the initial DOC concentration was similar between treatments. Glucose-amended (G) and non-amended (control) treatments were run in parallel. Over 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. Following 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). The 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). Nevertheless, 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. In contrast, the BGE in the A treatment was lower (1.7 %; n = 2), suggesting that most of the used labile DOC was catabolized. The 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. 
PY 2020
PD DEC
SO Biogeosciences
SN 1726-4170
PU Copernicus Gesellschaft Mbh
VL 17
IS 24
UT 000599653200001
BP 6271
EP 6285
DI 10.5194/bg-17-6271-2020
ID 78941
ER

EF