|
|
|
|
|
| Panagiotopoulos, C.; Sempere, R.; Para, J.; Raimbault, Patrick; Rabouille, Christophe; Charriere, B.. |
| Carbohydrates are important components of the carbon cycle and may be used as indicators of the origin and the diagenetic status of marine and terrestrial organic matter. Nevertheless, comprehensive studies of both particulate (PCHO) and dissolved (DCHO) carbohydrates in rivers are scarce, and the seasonal and interannual variability of these compounds in relationship to the bulk particulate (POM) and dissolved organic matter (DOM) is largely unknown. For the period 2007–2009, we sampled once per month POM and DOM and measured the total suspended matter (TSM), POM, DOM, PCHO, and DCHO for the Rhône River, which flows into the Mediterranean Sea. Using these measurements, we estimated for the above parameters annual fluxes for the period 2007–2009. The... |
| Tipo: Text |
|
| Ano: 2012 |
URL: https://archimer.ifremer.fr/doc/00140/25100/23210.pdf |
| |
|
|
| Berthelot, H; Moutin, T.; L'Helguen, S.; Leblanc, K.; Helias, S.; Grosso, O.; Leblond, N.; Charriere, B.; Bonnet, S.. |
| In the oligotrophic ocean characterized by nitrate (NO3-) depletion in surface waters, dinitrogen (N-2) fixation and dissolved organic nitrogen (DON) can represent significant nitrogen (N) sources for the ecosystem. In this study, we deployed large in situ mesocosms in New Caledonia in order to investigate (1) the contribution of N-2 fixation and DON use to primary production (PP) and particle export and (2) the fate of the freshly produced particulate organic N (PON), i.e., whether it is preferentially accumulated and recycled in the water column or exported out of the system. The mesocosms were fertilized with phosphate (PO43-) in order to prevent phosphorus (P) limitation and promote N-2 fixation. The diazotrophic community was dominated by... |
| Tipo: Text |
|
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00275/38672/73173.pdf |
| |
|
|
| Para, J.; Coble, P. G.; Charriere, B.; Tedetti, M.; Fontana, C.; Sempere, R.. |
| Seawater samples were collected monthly in surface waters (2 and 5m depths) of the Bay of Marseilles (northwestern Mediterranean Sea; 5 degrees 17 ' 3 '' E, 43 degrees 14 ' 3 '' N) during one year from November 2007 to December 2008 and studied for total organic carbon (TOC) as well as chromophoric dissolved organic matter (CDOM) optical properties (absorbance and fluorescence). The annual mean value of surface CDOM absorption coefficient at 350 nm [a(CDOM)(350)] was very low (0.10 +/- 0.02 m(-1)) in comparison to values usually found in coastal waters, and no significant seasonal trend in a(CDOM)(350) could be determined. By contrast, the spectral slope of CDOM absorption (S(CDOM)) was significantly higher (0.023 +/- 0.003 nm(-1)) in summer than in fall... |
| Tipo: Text |
|
| Ano: 2010 |
URL: https://archimer.ifremer.fr/doc/00372/48312/48416.pdf |
| |
|
|
| Eichinger, M.; Sempere, R.; Gregori, G.; Charriere, B.; Poggiale, J. C.; Lefevre, D.. |
| This paper assesses how considering variation in DOC availability and cell maintenance in bacterial models affects Bacterial Growth Efficiency (BGE) estimations. For this purpose, we conducted two biodegradation experiments simultaneously. In experiment one, a given amount of substrate was added to the culture at the start of the experiment whilst in experiment two, the same amount of substrate was added, but using periodic pulses over the time course of the experiment. Three bacterial models, with different levels of complexity, (the Monod, Marr-Pirt and the dynamic energy budget - DEB - models), were used and calibrated using the above experiments. BGE has been estimated using the experimental values obtained from discrete samples and from model... |
| Tipo: Text |
|
| Ano: 2010 |
URL: https://archimer.ifremer.fr/doc/00372/48311/48417.pdf |
| |
|
|
|
