Improving estuarine net flux estimates for dissolved cadmium export at the annual timescale: Application to the Gironde Estuary

Dabrin, Aymeric; Schäfer, Jörg; Blanc, Guillaume; Strady, Emilie; Masson, Matthieu; Bossy, Cécile; Castelle, Sabine; Girardot, Naïg; Coynel, Alexandra

doi:10.1016/j.ecss.2009.07.006

Cited by 42 publications

(38 citation statements)

References 48 publications

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“…This hypothesis is consistent with Cd-rich SPM sam-pled at HT in the bay at the beginning of the survey (Table 1), In contrast, during low water discharges from mid-June to July, the plume was less extended in the coastal zone and the turbidity zone had moved into the estuary (Fig. 4), inducing Cd desorption inside the estuary (Robert et al, 2004;Audry et al, 2007;Dabrin et al, 2009). In this condition, particles potentially reaching the bay are quasi Cd-depleted.…”

Section: Cadmium Partitioningsupporting

confidence: 83%

“…The bay is influenced by the Charente and Seudre Rivers (Fig. 1), but also by the historical polymetallic pollution of the Gironde Estuary waters (Latouche, 1988;Jouanneau et al, 1990;Blanc et al, 1999;Schäfer et al, 2002;Audry et al, 2007;Dabrin et al, 2009). Because of this pollution, the French Mussel Watch program (Réseau National d'Observation, RNO, and recently renamed Réseau d'Observation des Contaminants CHimiques, ROCCH), have been surveying Cd bioaccumulation in wild oysters from the Gironde and the MOB, since the 1970s.…”

Section: Introductionmentioning

confidence: 99%

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Roles of regional hydrodynamic and trophic contamination in cadmium bioaccumulation by Pacific oysters in the Marennes-Oléron Bay (France)

Strady

Blanc²,

Baudrimont³

et al. 2011

Chemosphere

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The Marennes-Oléron Bay, hosting the largest oyster production in France, is influenced by the historic polymetallic pollution of the Gironde Estuary. Despite management efforts and decreasing emissions in the Gironde watershed, cadmium levels in oysters from the bay are close to the consumption limit (5 μg g(-1) dw, EC). From mid April to mid July 2009, we investigated the role of tidal resuspension and regional hydrodynamics on Cd speciation (seawater, SPM, phytoplankton, sediment, microphytobenthos) and bioaccumulation in 18 month-old oysters (gills, digestive glands, rests of tissues) reared under natural conditions (i) at ∼60 cm above the sediment and (ii) on the sediment surface. Dissolved and particulate Cd concentrations in surface and bottom waters were similar and constant over tidal cycle suggesting the absence of Cd release during sediment resuspension. Temporal dissolved and particulate Cd concentrations were closely related to Gironde Estuary water discharges, showing increasing concentrations during flood situations and decreasing concentrations afterwards. Cd depletion in the water column was associated with increasing Cd in the [20-100 μm] plankton fraction, suggesting Cd bioaccumulation. After 3 months, enrichment factors of Cd in tissues of oysters exposed in the water column and directly on the sediment were respectively 3.0 and 2.2 in gills, 4.7 and 3.2 in digestive glands and 4.9 and 3.4 in remaining tissues. Increasing Cd bioaccumulation in gills, digestive glands and remaining tissues can be related to elevated dissolved Cd in the bay, suggesting gill contamination via the direct pathway and subsequent internal redistribution of Cd to other organs and tissues. Elevated Cd contents in oysters reared on tables could be attributed to different trophic Cd transfer (phytoplankton versus microphytobenthos) or to different oyster metabolisms between the rearing conditions as suggested by metallothionein concentrations.

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Section: Cadmium Partitioningsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Roles of regional hydrodynamic and trophic contamination in cadmium bioaccumulation by Pacific oysters in the Marennes-Oléron Bay (France)

Strady

Blanc²,

Baudrimont³

et al. 2011

Chemosphere

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“…between the two end-members. and for Zn such deviation could be explained by the formation of chloro-complexes (salinity and SPM positively correlate) (Hatje et al, 2003a;Waeles et al, 2005) (Dabrin et al, 2009;Deycard et al, 2014;Elbaz-Poulichet et al, 1996;Fu et al, 2013), for Co this is less expected considering its inorganic speciation. Contrary, no evident trends for other metals, or even increasing trend with salinity (Fe and Pb) were found (Fu et al, 2013).…”

Section: Distribution Of Kd In the Surface (Brackish) Layermentioning

confidence: 96%

Evidencing the natural and anthropogenic processes controlling trace metals dynamic in a highly stratified estuary: The Krka River estuary (Adriatic, Croatia)

Cindrić

Garnier

Oursel

et al. 2015

Marine Pollution Bulletin

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Distributions of trace metals (TM), organic carbon, SPM and physico-chemical parameters were studied in the highly stratified Krka River estuary in winter/summer periods. The nonconservative behaviour of Zn, Cd, Pb and Cu in the brackish layer (plume), easily spotted due to very low inputs by the river, was mainly caused by their inputs from the pleasure boats, nautical marinas and harbour (e.g. release from antifouling paints). Contrarily, Ni and Co followed near-conservative behaviour. The extremely low SPM discharged by the river,

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“…Ainsi cette étude propose une méthode de quantification des flux nets annuels de métaux dissous plus précise que celle précédemment publiée (e.g. Chester, 1990 ;Dabrin et al, 2009). L'utilisation de la nouvelle méthode de calcul permettra de décrire plus précisément l'évolution des flux nets annuels de cadmium dissous de 1989 à 2017, c'est-à-dire sur la majeure partie de la période de décroissance de la pollution cadmiée en Gironde.…”

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Nouveau modèle analytique pour une meilleure estimation des flux nets annuels en métaux dissous. Cas du cadmium dans l’estuaire de la Gironde

et al. 2019

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Nouveau modèle analytique pour une meilleure estimation des flux nets annuels en métaux dissous. Cas du cadmium dans l'estuaire de la Gironde New computation for a better estimation of the annual dissolved metal net fluxes. The case of the cadmium in the Gironde estuary Abstract -Despite major management efforts initiated in 1987 and 2007 and decreasing emissions in the Gironde watershed, cadmium (Cd) levels in oysters from the downstream Gironde estuary are still higher to the consumption limit (5 mg/kg, dw, EC). Dissolved Cd concentrations were measured in surface water collected in the Gironde estuary during nine cruises (2014 -2015). The obtained theoretical (Cd d 0 ) concentrations and the daily net Cd d fluxes, using the Boyle's method, confirm a decadal stepping decrease of the Cd pollution corresponding to that observed in the oysters from the long term national monitoring for priority contaminants at the estuary mouth. As this observation invalidates the previous estimating methods for estimating annual net Cd d fluxes, we propose an original empirical model applicable for the four last decades. This model is based on four exponential functions with defined boundaries for low water discharges. Each of them is representative of one distinct situation of Cd pollution in the watershed relative to major remediation processes implemented in the last four decades. These results allow to develop a direct estimation of the annual net Cd d fluxes only based on the data of the annual mean discharge. Thus, this study demonstrates the strength of the field research in geochemistry to obtain a better quantification of the exportation of dissolved bioavailable pollutants from the continental watersheds to the coastal ocean.

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Improving estuarine net flux estimates for dissolved cadmium export at the annual timescale: Application to the Gironde Estuary

Cited by 42 publications

References 48 publications

Roles of regional hydrodynamic and trophic contamination in cadmium bioaccumulation by Pacific oysters in the Marennes-Oléron Bay (France)

Roles of regional hydrodynamic and trophic contamination in cadmium bioaccumulation by Pacific oysters in the Marennes-Oléron Bay (France)

Evidencing the natural and anthropogenic processes controlling trace metals dynamic in a highly stratified estuary: The Krka River estuary (Adriatic, Croatia)

Nouveau modèle analytique pour une meilleure estimation des flux nets annuels en métaux dissous. Cas du cadmium dans l’estuaire de la Gironde

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