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Trace metal speciation? An essential aspect of biomonitoring to avoid wrong conclusions
Richir, Jonathan; Lepoint, Gilles; Donnay, Annick et al.
2015DGT Conference 2015
 

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Keywords :
Trace metal; speciation; biomonitoring; Mytilus galloprovincialis; Calvi bay
Abstract :
[en] The Mediterranean mussel Mytilus galloprovincialis is widely used as a bioindicator species in active monitoring surveys. As a filter feeder artificially maintained in the water column, it bioaccumulates trace metals from the surrounding water in their dissolved and particulate forms. However, most monitoring surveys don’t take into account that speciation aspect when studying trace metal accumulation kinetics in mussels. In the framework of the STARECAPMED project, we monitored trace metal concentrations in the flesh of mussels together with their “most bioavailable” dissolved and particulate fractions in the water column for almost 5 months (February-June 2011). Mussels were purchased from 2 little contaminated French shellfish farms (SARL Etang de Diane and ferme marine des Aresquiers), placed in several pouches to allow regular sampling, and immerged near the Oceanographic Research Station STARESO in the Calvi bay, northwestern Corsica. Mussels and water samples for suspended matter filtration were collected every week to two weeks, as were deployed DGTs. Seawater samples were filtered through 47 mm hydrophilic PTFE membrane filters with a 0.45 µm pore size until clogging. In the laboratory, mussel flesh and filters were digested in Teflon vessels with acids (HNO3/H202) in a closed microwave digestion lab station. DGT resins were eluted for 24h in 1.0 M HNO3. Trace metal concentrations (Cr, Mn, Co, Ni, Cu, Zn, Ag, Cd, Pb) were measured by DRC-ICP-MS. Analytical accuracy was checked by analyzing CRMs. All the studied metals except Pb and Zn were present in the water column to over 80% in their dissolved form. The contribution of the dissolved pathway was thus likely to be predominant in the oligotrophic Calvi bay. Dissolved trace metals showed little temporal variability of their levels, likely resulting from the integration over time of their levels in the DGT probes and the lack of seasonality of this fraction. In contrast, Zn showed great variability of its particulate fraction during the survey. Such temporal variability was also observed for Cr, more abundant in its particulate form at the end of the survey, and for Mn and Pb that conversely tended to decrease. The dynamic of trace metals in the mussel flesh is regulated by the environmental bioavailability of dissolved and particulate metals, the ecophysiological status of mussels and the trophic conditions of the water body. In the oligotrophic Calvi bay, showing background contamination levels by metals, the trophic conditions played a major role once out of the spring plankton bloom. It led to the increase of metal concentrations measured in the flesh of mussels undergoing starvation. However, some metals such as Cu and Co displayed only little temporal variations of their concentrations, these essential micronutrients being well regulated. The combined study of trace metal bioavailability and mussel ecophysiology in defined environmental conditions allows discriminating against biotic and abiotic factors regulating contaminant uptake in mussels, thus avoiding wrong conclusions about the observed dynamics of the studied contaminants. Mussels are a good proxy of coastal water quality, but their proper use notably requires adjustment of raw contaminant concentrations with trophic status of monitored sites.
Research center :
STARESO SAS (France) - Laboratory of Oceanology, ULiège (Belgium) - IFREMER, Laboratoire Environnement Ressource Provence Azur Corse (France) - Numerical Ecology of Aquatic Systems, UMons (Belgium)
Disciplines :
Earth sciences & physical geography
Author, co-author :
Richir, Jonathan  ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Océanologie
Lepoint, Gilles  ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Océanologie
Donnay, Annick 
Lejeune, Pierre
Gonzalez, Jean-Louis
Bouchoucha, Marc
Chiffoleau, Jean-François
Andral, Bruno
Gobert, Sylvie  ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Océanologie
Language :
English
Title :
Trace metal speciation? An essential aspect of biomonitoring to avoid wrong conclusions
Publication date :
29 September 2015
Number of pages :
A0
Event name :
DGT Conference 2015
Event organizer :
AZTI-Tecnalia - Environment Centre of Lancaster University
Event place :
Donostia-San Sebastián, Spain
Event date :
28th September to 1st October
Audience :
International
Name of the research project :
STARECAPMED project
Funders :
Laboratory of Oceanology, University of Liege (Belgium)
Available on ORBi :
since 01 December 2015

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