MGTS 2015 LEG1
| Type | Oceanographic cruise |
|---|---|
| Set | This cruise is part of the set MGTS |
| Ship | Thalia |
| Ship owner | Ifremer |
| Dates | 02/03/2015 - 09/03/2015 |
| Chief scientist(s) | SCHAFER Jörg , COYNEL Alexandra |
ENVIRONNEMENTS ET PALÉOENVIRONEMENTS OCÉANIQUES ET CONTINENTAUX (EPOC) - TALENCE UMR CNRS 5805 EPOC - OASU - Université de Bordeaux Bâtiment A12 351 Cours de la Libération 33405 TALENCE CEDEX +33 (0)5 40 00 36 15 |
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| DOI | 10.17600/15009300 |
| Objective | Biogeochemical research on the estuarine ecosystem of the Gironde River are societally motivated by the persistence of polymetallic which impacts the true economic potential of shellfish farming. The aim of this cruise is to provide reliable information about the possibility of developing shellfish farming in the Gironde in the context of decreasing metallic pollution. To do so, it is necessary to rank the processes determining the specification and mobility of metals by studying the possible interactions between dissolved, colloidal and particulate metals while completely including the plankton compartment and filter-feeder organisms (oysters). We proposed to check the net fluxes of Cd and Cu, and even those of V, Mo, U, Ni, and dissolved Co, previously established by Dabrin et al.'s model (2009), as well as to acquire new data to be used to estimate the possible differences with the Decazeville spring remediation plan (2007-2016). The decrease in cadmiferous pollution of the estuary must also be documented by recording the concentrations of cadmium carried by suspended matter from the Gironde River. Time logs of these concentrations will make it possible to characterize the system's resilience, and then draw up a calendar for sustainable development of shellfish farming in the Gironde to be initiated. As for the issues of organotin substances (TBT) identified in Gironde transition waters (AEAG journal, March 2012) we propose to verify this information and determine the biogeochemical consequences and, if possible, the causes. |
