Consulta: creatorFacets:"Auger, Dominique"
Registros recuperados: 17
Data/hora: 07/06/2024 05:33:37

Past and present platinum contamination of a major European fluvial-estuarine system: Insights from river sediments and estuarine oysters
Provedor de dados: 5
Autores: Abdou, M.; Schaefer, J.; Cobelo-garcia, A.; Neira, P.; Petit, J. C. J.; Auger, Dominique; Chiffoleau, Jean-francois; Blanc, Gerard.
Platinum Group Metals (PGM) are modern, technologically relevant elements for which (i) the anthropogenic cycle has outcompeted the natural cycles and (ii) environmental behavior, fate and impact are still widely unknown. Stripping voltammetry was used for accurate determinations of platinum (Pt) in historical records of river sediments and estuarine oysters from the Gironde fluvial-estuarine continuum (SW France) comprising the Lot River. Sediment cores from the Lot River, dated from 1952 to 2001, showed past Pt contamination due to former industrial (smelter) activities in the Lot River watershed. These samples revealed the phasing-out of a historical Pt contamination with Pt/Th (Thorium) values of 11 × 10− 5 ± 0.79 × 10− 5 for the deepest part of the...
Tipo: Text
Palavras-chave: Platinum; Sediments; Wild oysters; Bioaccumulation.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00311/42177/41478.pdf

Distribution of Cd and Hg in the Bay of Marennes-Oléron
Provedor de dados: 5
Autores: Gonzalez, Jean-louis; Boutier, Bernard; Chiffoleau, Jean-francois; Auger, Dominique; Noel, Joelle; Truquet, Isabelle.
The study of Cd and Hg distribution in the sediments, water and suspended matter of the Bay of Marennes-Oléron provided the opportunity to identify the factors governing the distribution of these two contaminants throughout the bay. On one hand, these elements are associated with the continental inputs from the Charente river which settle on arrivaI at the mouth of the estuary and in the eastern part of the bay. The Cd and Hg present in these deposits are associated with POC, as weIl as with Mn and Fe oxides and hydroxides. On the other hand, a portion of the dissolved inputs is recycled in the bay waters through phytoplankton activity. This mechanism contributes, particularly in the case of Cd, to increased particulate metal fluxes from the water column...
Tipo: Text
Palavras-chave: Baie de Marennes-Oléron; Métaux lourds; Sédiments; MES; Activité phytoplanctonique; BAY OF MARENNES-OLERON; HEAVY METALS; SEDIMENTS; SUSPENDED MATTER; PHYTOPLANKTON ACTIVITY.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/00085/19604/17242.pdf

Effect of local hydroclimate on phytoplankton groups in the Charente estuary
Provedor de dados: 5
Autores: Guesdon, Stephane; Stachowski-haberkorn, Sabine; Lambert, Christophe; Beker, Beatriz; Brach-papa, Christophe; Auger, Dominique; Bechemin, Christian.
This study aimed to describe seasonal variations of phytoplankton abundances in relation to the physical and chemical (nutrients and metals) environment under the influence of freshwater input in the Charente river estuary (Marennes-Oléron bay, France) over three years, from 2011 to 2014. Phytoplankton abundances were determined using microscopy and flow cytometry. Considering high frequency temperature and salinity data, breakpoints in each series led to the identification of two local hydroclimatic periods: the first (2011 and early 2012) being warmer and higher in salinity than the second (from spring 2012 to the beginning of 2014). A multiblock PLS analysis highlighted the significant contribution of the physical environment (temperature, salinity and...
Tipo: Text
Palavras-chave: Hydroclimate; Estuary; Phytoplankton; Size composition; Nutrients; Trace metals.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00349/46005/45674.pdf

Long-term records of cadmium and silver contamination in sediments and oysters from the Gironde fluvial-estuarine continuum - Evidence of changing silver sources
Provedor de dados: 5
Autores: Lanceleur, Laurent; Schaefer, Joerg; Chiffoleau, Jean-francois; Blanc, Gerard; Auger, Dominique; Renault, Sophie; Baudrimont, Magalie; Audry, Stephane.
The Gironde fluvial estuarine system is impacted by historic metal pollution (e.g. Cd, Zn, Hg) and oysters (Crassostrea gigas) from the estuary mouth have shown extremely high Cd concentrations for decades. Based on recent work (Chiffoleau et al., 2005) revealing anomalously high Ag concentrations (up to 65 mg kg(-1); dry weight) in Gironde oysters, we compared long-term (similar to 1955-2001) records of Ag and Cd concentrations in reservoir sediment with the respective concentrations in oysters collected between 1979 and 2010 to identify the origin and historical trend of the recently discovered Ag anomaly. Sediment cores from two reservoirs upstream and downstream from the main metal pollution source provided information on (i) geochemical background...
Tipo: Text
Palavras-chave: Silver; Cadmium; Estuary; Oyster; Biomonitoring.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00060/17109/15071.pdf

Méthode de dosage du cadmium, du cuivre, du plomb et du zinc dans la chair de poissons
Provedor de dados: 5
Autores: Auger, Dominique.
An analytical technique for cadmium, copper, lead and zinc determination in fish tissue used in monitoring programmes is described. Atomic absorption spectrophotometry on nitric digested samples is performed.
Tipo: Text
Palavras-chave: Cadmium; Cuivre; Poisson; Plomb; Zinc; Analyse; Cadmium; Copper; Lead; Zinc; Fish; Determination.
Ano: 1989
URL: https://archimer.ifremer.fr/doc/00489/60059/63343.pdf

Effets de l'hydroclimat local sur les groupes de phytoplancton dans l'estuaire de la Charente
Provedor de dados: 5
Autores: Guesdon, Stephane; Stachowski-haberkorn, Sabine; Lambert, Christophe; Beker, Beatriz; Brach-papa, Christophe; Auger, Dominique; Bechemin, Christian.
Cette étude s’inscrit dans le cadre du projet TOPHYPAC (2011-2014) financé par le programme “Pesticides” du Ministère de l’Écologie, du Développement durable et de l’Énergie. Ce travail vise à décrire les variations saisonnières des abondances de phytoplancton en lien avec l'environnement physique et chimique (nutriments et métaux) de l'estuaire de la Charente de 2011 à 2014. À partir des données d'abondances de groupes phytoplanctoniques déterminés par microscopie et par cytométrie de flux, les contributions relatives des variables environnementales sur la dynamique du phytoplancton ont été évaluées : dans ce but, une analyse PLS multibloc a été réalisée. Celle-ci souligne une contribution importante de l'environnement physique (température, salinité et...
Tipo: Text
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00361/47173/47139.pdf

Evolution temporelle du comportement estuarien du mercure: cas de l'estuaire de la Loire
Provedor de dados: 5
Autores: Knoery, Joel; Brach Papa, Christophe; Thomas, Bastien; Auger, Dominique; Chouvelon, Tiphaine; Crochet, Sylvette; Rozuel, Emmanuelle; Sanjuan, Jane; Thibault, Aubin; Chiffoleau, Jean-francois.
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00212/32356/30812.pdf

Retrospective study of metal contamination time trends in the French part of the Bay of Biscay
Provedor de dados: 5
Autores: Boutier, Bernard; Quintin, Jean-yves; Rozuel, Emmanuelle; Auger, Dominique; Bretaudeau-sanjuan, Jane.
Two cores were sampled in the Bay of Biscay: one a few miles off the Gironde estuary (pointe de la Coubre), the other near the Spanish border (Capbreton canyon) to study past variations in sediment contamination. Radiochronology (210Pb, 137Cs) and total metal determinations by ICP-MS allowed the study of time trends for metal concentrations in sediment. Off the Gironde, during the time interval recorded by the core (1958–1999), all metal concentrations remained less than OSPAR background values. Some variations occurred along the Cd and Zn profiles, which may correspond to a very attenuated signal from the Gironde outputs. This suggests that this area was not submitted to any significant anthropogenic input of metals between 1958 and 1999. In the canyon of...
Tipo: Text
Palavras-chave: Sediment; Metal contamination; Dating; Cores; Time trends.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00061/17254/16094.pdf

Chemical contaminants (trace metals, persistent organic pollutants) in albacore tuna from western Indian and south-eastern Atlantic Oceans: Trophic influence and potential as tracers of populations
Provedor de dados: 5
Autores: Chouvelon, Tiphaine; Brach-papa, Christophe; Auger, Dominique; Bodin, Nathalie; Bruzac, Sandrine; Crochet, Sylvette; Degroote, Maxime; Hollanda, Stephanie J.; Hubert, Clarisse; Knoery, Joel; Munschy, Catherine; Puech, Alexis; Rozuel, Emmanuelle; Thomas, Bastien; West, Wendy; Bourjea, Jerome; Nikolic, Natacha.
Albacore tuna (Thunnus alalunga) is a highly commercial fish species harvested in the world's Oceans. Identifying the potential links between populations is one of the key tools that can improve the current management across fisheries areas. In addition to characterising populations' contamination state, chemical compounds can help refine foraging areas, individual flows and populations' structure, especially when combined with other intrinsic biogeochemical (trophic) markers such as carbon and nitrogen stable isotopes. This study investigated the bioaccumulation of seven selected trace metals – chromium, nickel, copper (Cu), zinc (Zn), cadmium (Cd), mercury (Hg) and lead – in the muscle of 443 albacore tunas, collected over two seasons and/or years in the...
Tipo: Text
Palavras-chave: Top predator; Bioaccumulation; Inorganic elements; Organic contaminants; Stable isotopes; Intrinsic markers.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00384/49532/51152.pdf

L'argent (Ag, nanoAg) comme contaminant émergeant dans l'Estuaire de la Gironde : évaluations scientifiques et gouvernance des risques
Provedor de dados: 5
Autores: Salles, Denis; Roumezi, Alexis; Lanceleur, Laurent; Schaefer, Jorg; Petit, Jerome; Blanc, Gerard; Coynel, Alexandra; Chiffoleau, Jean-francois; Auger, Dominique.
This article presents the results of multidisciplinary research (geochemistry, sociology) into the increasing concentrations of silver (Ag and nanoAg) in the environment and their potential impact on aquatic environments. We investigate simultaneously the risk of contamination of these environments by silver and the process of the social and political construction of this risk by water managers, health authorities, agencies and committees responsible for expert evaluations, environmental associations, and potential users of silver or nano-silver. Four updated models of risk construction allow us to understand the logic of arguments mobilized at this stage of the emerging risk. This interdisciplinary cooperation opens up possibilities for dealing with some...
Tipo: Text
Palavras-chave: Environment; Estuaries; Geochemistry; Interdisciplinary communication; Nanotechnology; Risk assessment; Risk management; Silver; Sociology; Water pollutants.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00156/26736/24939.pdf

Metal concentrations in sediment and Nereis diversicolor in two Moroccan lagoons: Khnifiss and Oualidia
Provedor de dados: 5
Autores: Idardare, Zaina; Chiffoleau, Jean-francois; Moukrim, A; Alla, A; Auger, Dominique; Lefrere, L; Rozuel, Emmanuelle.
Metal concentrations were measured monthly during an annual cycle (December 2004 to January 2006) in the tissues of Nereis diversicolor ragworms and sediment from two Moroccan Atlantic coastal lagoons: Oualidia in the north, situated in a highly industrialised urban area and Khnifiss in the south, far from anthropogenic influences. Relatively high levels of Zn, Ag and Cd were found in the sediment of Oualidia lagoon, while Ni concentrations were shown to be high at Khnifiss. The significant metal levels at Oualidia are a result of industrial and urban discharges, coupled with discharges from adjacent phosphate ore processing plants. Trace metal concentrations in worms vary according to season; they are usually high in winter and spring, in relation to the...
Tipo: Text
Palavras-chave: Morocco; Coastal lagoons; Sediments; Nereis diversicolor; Metals.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-6127.pdf

Behaviour of arsenic on the continental shelf off the Gironde estuary: role of phytoplankton in vertical fluxes during spring bloom conditions
Provedor de dados: 5
Autores: Michel, Pierre; Boutier, Bernard; Herbland, Alain; Averty, Bernard; Artigas, Lf; Auger, Dominique; Chartier, E.
The arsenic (As) cycle in the marine environment is known to be sensitive to biological activity. Within the scope of the National Coastal Oceanography Program, we undertook a specific study of the behaviour of this element in a water column on the continental shelf of the Bay of Biscay off the Gironde estuary during two oceanographic cruises conducted in May 1994 and May 1995. Various chemical forms were measured: arsenite (As3), at-senate (As5), monomethylarsenic (MMA), dimethylarsenic (DMA) and dissolved total As after ultraviolet mineralization. The net flux of total As from the Gironde estuary was evaluated as well as its effect on the concentration in surface marine waters. The vertical profiles in the coastal zone during a period of active primary...
Tipo: Text
Palavras-chave: Arsenic; Phytoplankton; Speciation; Gironde plume; Biscay Bay.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/publication-851.pdf

La contamination par le cadmium des poissons et crustacés de l'étang de Bages-Sigean
Provedor de dados: 5
Autores: Claisse, Didier; Aranda, Alain; Auger, Dominique.
Les résultats du Réseau National d'Observation de la qualité du milieu marin (RNO), et d'une étude menée par Ifremer en avril 1990, ont montré une forte contamination de l'étang de Bages-Sigean (Aude) par le cadmium. Cette contamination a été mise en évidence dans l'eau, le sédiment et les moules.  A la demande de la préfecture de l'Aude, une campagne de prélèvement de poissons, crevettes et crabes a été organisée en avril 1991 afin d'établir les niveaux de contamination des produits de la pêche de l'étang. Les analyses ont porté sur le muscle d'anguilles, de mulets, d'athérines, de gobies, de crevettes, ainsi que sur un mélange de chair de crabes verts.  Les concentrations en cadmium mesurées sur l'ensemble de l'échantillonnage n'excèdent pas 0.007 mg/kg,...
Tipo: Text
Ano: 1991
URL: http://archimer.ifremer.fr/doc/00016/12698/9619.pdf

Vertical mercury profile in relation to arsenic, cadmium and copper at the eastern north-atlantic ices reference station
Provedor de dados: 5
Autores: Cossa, Daniel; Michel, Pierre; Noel, Joelle; Auger, Dominique.
Mercury (total mercury), arsenic, cadmium, copper and nutrient concentration profiles (fourteen depths) were obtained at the ICES (International Council for the Exploration of the Sea) reference station (46-degrees-N; 6-degrees-W) in 4 680 m of water in the northeastern Atlantic Ocean. Concentrations of mercury generally ranged from 0.4 to 10 pM. The main feature of the vertical mercury profile was a broad peak between 150 and 1 500 m. Examination of the mercury profile in relation to water mass structure and comparison with nutrient and other elemental distributions suggested that its shape results from a remobilization of mercury during mineralization of sinking organic detritus combined with its intense scavenging in deeper waters.
Tipo: Text
Ano: 1992
URL: http://archimer.ifremer.fr/doc/00101/21185/18802.pdf

Distribution of silver in mussels and oysters along the French coasts: Data from the national monitoring program
Provedor de dados: 5
Autores: Chiffoleau, Jean-francois; Auger, Dominique; Roux, Nathalie; Rozuel, Emmanuelle; Santini, Anne.
Distribution and behavior of many trace elements in the aquatic environment has been well characterized, but little is known about silver (Ag) concentrations in coastal waters, even though this element ranks among the most toxic to marine invertebrates (Calabrese et al., 1977 ; Fisher and Hook, 1997 ; Webb and Wood, 1998). Studies conducted by Flegal et al. (1995), River-Duarte et al. (1999), and Ndung'u et al. (2001), provided the first valuable data on Ag distribution in the oceanic environment, indicating that this element is found in very low concentrations in the dissolved phase. However, although silver concentrations in coastal waters do not reach the nanomolar range (Smith and Flegal, 1993 ; Squire et al., 2002), formation of a stable chloro...
Tipo: Text
Palavras-chave: Mollusks; Coastal water; Silver; Monitoring.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-2553.pdf

Monitoring of Pb Contamination in Loire Estuary: Trends, Distribution and Isotopic composition
Provedor de dados: 5
Autores: Brach-papa, Christophe; Chiffoleau, Jean-francois; Knoery, Joel; Chouvelon, Tiphaine; Auger, Dominique; Bretaudeau-sanjuan, Jane; Crochet, Sylvette; Rozuel, Emmanuelle; Thomas, Bastien; Vasileva, Emilia; Oriana, Anna Maria.
The Loire River is one of the largest river systems in Western Europe and a major source of continental inputs to the marine environment in the Bay of Biscay. Its catchment area drains agricultural and industrial zones and its estuary is increasingly urbanized. Even if the Loire River is not considered as a highly polluted system, studies have shown estuarine Pb contamination due to industrial inputs and combustion of leaded gasoline until the mid 1990’s. A retrospective study, based on the analysis (Pb levels and isotopic composition) of mussel samples collected by the French mussel watch program (RNO/ROCCH) has highlighted this contamination and its trend between 1985-2005 (Couture et al., 2010). This poster furthers the work initiated by Couture et al....
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00188/29958/28404.pdf

The estuarine geochemical reactivity of Zn isotopes and its relevance for the biomonitoring of anthropogenic Zn and Cd contaminations from metallurgical activities: Example of the Gironde fluvial-estuarine system, France
Provedor de dados: 5
Autores: Petit, Jerome C. J.; Schafer, Jörg; Coynel, Alexandra; Blanc, Gerard; Chiffoleau, Jean-francois; Auger, Dominique; Bossy, Cecile; Derriennic, Herve; Mikolaczyk, Mathilde; Dutruch, Lionel; Mattielli, Nadine.
Zinc stable isotopes measurements by MC-ICP-MS, validated by laboratory intercalibrations, were performed on wild oysters, suspended particles and filtered river/estuarine water samples to provide new constraints for the use of Zn isotopes as environmental tracers. The samples selected were representative of the long range (400 km) transport of metal (Zn, Cd, etc.) contamination from former Zn-refining activities at Decazeville (i.e. δ66Zn &gt; 1 ‰) and its phasing out, recorded during 30 years in wild oysters from the Gironde Estuary mouth (RNO/ROCCH sample bank). The study also addresses additional anthropogenic sources (urban and viticulture) and focuses on geochemical reactivity of Zn in the turbidity gradient and the maximum turbidity zone (MTZ) of...
Tipo: Text
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00277/38852/37390.pdf