Unpublished conference/Abstract (Scientific congresses and symposiums)
Combined utilization of DGTs and bioindicators to trace chemical contamination threats on coastal ecosystems
Richir, Jonathan; Luy, Nicolas; Serpe, Pierre et al.
201143rd Colloquium on Ocean Dynamics
 

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Keywords :
trace elements; diffusive gradients in thin films; bioindicators
Abstract :
[en] Trace metal monitoring in marine organisms and their living habitats permit to trace chronic or acute contaminations of marine ecosystems due to human activities. While dissolved trace metal concentrations give us an overall and punctual view over biota contamination status, bioindicator species put their bioavailable and possible toxic fraction in an obvious. However, difficulties mainly inherent to metal measurements in seawater lead field ecotoxicologists to study marine pollution essentially through the use of bioindicators alone. The technique of diffusive gradients in thin films (DGT) for the measurement of trace metals in aqueous solutions was introduced in the mid-ninetieth by Davison and Zhang. This passive probe accumulates labile trace metal species in proportion to their bulk environmental concentrations by maintaining a negative gradient between the environment and an ion-exchange resin (Chelex). DGTs average natural water trace metal concentrations over the deployment period, concentrate them and avoid matrix interferences, notably due to dissolved salts in seawater. Their deployment in passive and experimental monitoring studies permits to reliably measure labile trace metal concentrations and, jointly analysed with bioindicators, to estimate their bioavailability to marine organisms. This combined approach DGT-bioindicator was investigated in Calvi Bay (Corsica) through three monitoring studies. (1) DGTs were deployed in Posidonia oceanica bed, a Mediterranean seagrass forming dense meadows from the surface down to 40 meters depth, to study seasonal, spatial and bathymetrical variations of labile trace metal concentrations within this meadow. These concentrations were analysed jointly with Posidonia trace metal contents in order to quantify their bioaccumulation towards this primary producer, taking into account the seagrass biological cycle. (2) Portions of Posidonia meadow were also in situ experimentally contaminated with a mix of dissolved metals to study seagrass kinetics of pollutant accumulation and decontamination. Thanks to DGTs deployed inside contaminated mesocosms throughout experiments, Posidonia responses to known metal concentrations could be precisely quantified. (3) The blue mussel Mytilus galloprovincialis is widely used in trace metal monitoring programs. Mussels, stored in conchylicultural pouches, were transplanted for 3 months in contrasted stations of Calvi Bay (e.g. aquaculture farm, sewer, etc.) in parallel with DGTs. Such as for Posidonia, the complementary utilization of DGTs and mussels permitted to describe water contamination levels at the scale of the Bay, and their bioaccumulation towards mussels. These 3 studies demonstrate the usefulness of DGTs to monitor labile trace metals in an ecological and ecosystemic approach, in parallel with marine organisms, both indicators furnishing different and complementary informations about ecosystem functioning.
Research center :
Laboratoire d'Océanologie
Disciplines :
Aquatic sciences & oceanology
Environmental sciences & ecology
Author, co-author :
Richir, Jonathan  ;  Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Océanologie
Luy, Nicolas
Serpe, Pierre
Lefèbvre, Lucie
Deraikem, Alexandre
Lepoint, Gilles  ;  Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Océanologie
Biondo, Renzo ;  Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Océanologie
Gobert, Sylvie  ;  Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Océanologie
Language :
English
Title :
Combined utilization of DGTs and bioindicators to trace chemical contamination threats on coastal ecosystems
Publication date :
03 May 2011
Number of pages :
1
Event name :
43rd Colloquium on Ocean Dynamics
Event organizer :
Université de Liège (Bruno Delille et Marilaure Grégoire)
Event place :
Liège, Belgium
Event date :
du 02 mai 2011 au 06 mai 2011
Audience :
International
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 16 May 2011

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