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Registros recuperados: 12
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Behaviour of arsenic on the continental shelf off the Gironde estuary: role of phytoplankton in vertical fluxes during spring bloom conditions ArchiMer
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
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Bilan 1992 de la contamination des côtes françaises par les composés organostanniques ArchiMer
Michel, Pierre; Averty, Bernard.
Au cours du printemps 1992, un échantillonnage systématique a permis d'évaluer le niveau de la contamination des côtes françaises par les composés organostanniques. Le tributyl étain (TBT) a été mesuré dans la phase dissoute avec ses produits de dégradation dibutyl étain (DBT) et monobutyl étain (MBT). Les concentrations mesurées restent importantes dans les zones portuaires et les zones de mélanges. Ces concentrations sont le plus souvent excessives lorsqu'on se réfère au seuil toxique de 1ng.1-1 pour lequel des effets sont connus sur l'huître et certains autres mollusques. Les trois façades maritimes françaises ont été contôlées ; c'est en Méditerranée que l'on peut observer les plus fortes concentrations. En plus du TBT et de ses métabolites, on a aussi...
Tipo: Text Palavras-chave: Tributyl étain; Dibutyl étain; Monobutyl étain; Triphényl étain; Composés organostanniques; Eau de mer; France.; Tributyltin; Dibutyltin; Monobutyltin; Triphenyltin; Organotin compounds; Seawater; French coasts.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00104/21530/19111.pdf
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Bilan 1997 de la contamination des eaux côtières françaises par les composés organostanniques. ArchiMer
Michel, Pierre; Averty, Bernard.
Il y a quinze ans, la France prenait des mesures réglementaires pour restreindre l'usage des composés organostanniques dans les peintures antisalissures utilisées pour la protection des coques de bateaux. Il s'agissait alors d'une réaction d'urgence face au problème vital posé à l'ostréiculture française. La France était le premier pays à prendre de telles dispositions. Depuis, la réglementation a été confirmée à plusieurs reprises, en dernier lieu par le décret n°92-1074 du 2 octobre 1992. Quinze ans plus tard, où en sommes nous ? La campagne de mesure des composés organostanniques dans l'eau de mer, conduite par l'IFREMER de juillet à septembre 1997 a permis de faire le point de la situation. La contamination des côtes françaises reste préoccupante. Pour...
Tipo: Text Palavras-chave: Composés organostanniques; Tributyl étain; TBT; Peintures antisalissures; Eaux côtières; Organotin compounds; Ributyltin; TBT; Antifouling paints; Coastal waters.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00104/21557/19136.pdf
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Evaluation of dissolved and particulate arsenic flux in the Dover strait (fluxmanche program) ArchiMer
Michel, Pierre; Averty, Bernard; Noel, Joelle; Sanjuan, Jane.
In order to estimate arsenic flux from the English Channel toward the North Sea, 168 samples were obtained from September 1990 to November 1991 along a transect between Boulogne and Folkestone comprising six stations and two depths. Organic and inorganic arsenic were measured in dissolved phase and total arsenic in suspended particles. The mean concentration of dissolved total arsenic in water was 1.38 +/- 0.12 mug.l-1. The variability of measured concentrations was low, particularly for the four intermediate stations. Results were slightly more sensitive for English (1.38 +/- 0.12 mug.l-1) and French (135 +/- 0.11 mug.l-1) coastal stations due to exchanges with shallower sediments. Dissolved organic arsenic was nearly negligible from December to March...
Tipo: Text Palavras-chave: ARSENIC MMA; DMA TRACE ELEMENTS ENGLISH CHANNEL NORTH SEA.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00100/21079/18704.pdf
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First record of butyltin body burden and imposex status in Hexaplex trunculus (L.) along the Tunisian coast ArchiMer
Lahbib, Youssef; Abidli, Sami; Chiffoleau, Jean-francois; Averty, Bernard; El Menif, Najoua Trigui.
We have assessed for the first time the current status of tributyltin (TBT) contamination in Hexaplex trunculus along Tunisian coastal waters. Two sampling campaigns have been performed in July 2004 and July 2007 at seven different sites. The snails were analyzed for imposex status, i.e. Imposex incidence, Relative Penis Length Index (RPLI) and Vas Deferens Sequence Index (VDSI), followed by the quantification of butyltins in their tissues. Imposex was detected in six populations from the 2004 samples and in five populations from the 2007 samples. The imposex incidence ranged from 0 (no imposex) to 100%, the RPLI from 0 to 56.7 and the VDSI from 0 to 4.4. TBT was also detected in six populations in 2004 and five populations in 2007. The concentrations...
Tipo: Text Palavras-chave: Tunisia; Imposex; Hexaplex trunculus; TBT; Tributyltin.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6499.pdf
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Imposex and butyltin concentrations in snails from the lagoon of Bizerta (Northern Tunisia) ArchiMer
Lahbib, Youssef; Abidli, Sami; Chiffoleau, Jean-francois; Averty, Bernard; Trigui El Menif, Najoua.
Imposex and butyltin concentrations were assessed in Hexaplex trunculus, Conus mediterraneus, Cyclope neritea and Nassarius mutabilis from Menzel Jemil, and H. trunculus and Stramonita haemastoma from the Bizerta channel. All females of the five species exhibited the characteristic development of male sex organs (penis and/or vas deferens). In Menzel Jemil, H. trunculus and C. mediterraneus exhibit similar imposex levels and were most affected (VDS reading 3-4). The development of a bud penis or a vas deferens sequence behind the right ocular tentacle was reported in Cyclope neritea and N. mutabilis (VDS 1). The concentration of tributyltin (TBT) was similar for the four species. The monobutyltin (MBT) was only detected in C. mediterraneus while the...
Tipo: Text Palavras-chave: Bioindicators; Gastropods; Organotins; Southern Mediterranean.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00015/12638/9569.pdf
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Mercury in the Southern Ocean ArchiMer
Cossa, Daniel; Heimbuerger, Lars-eric; Lannuzel, Delphine; Rintoul, Stephen R.; Butler, Edward C. V.; Bowie, Andrew R.; Averty, Bernard; Watson, Roslyn J.; Remenyi, Tomas.
We present here the first mercury speciation study in the water column of the Southern Ocean, using a high-resolution south-to-north section (27 stations from 65.50 degrees S to 44.00 degrees S) with up to 15 depths (0-4440 m) between Antarctica and Tasmania (Australia) along the 140 degrees E meridian. In addition, in order to explore the role of sea ice in Hg cycling, a study of mercury speciation in the "snow-sea ice-seawater" continuum was conducted at a coastal site, near the Australian Casey station (66.40 degrees S; 101.14 degrees E). In the open ocean waters, total Hg (Hg(T)) concentrations varied from 0.63 to 2.76 pmol L(-1) with "transient-type" vertical profiles and a latitudinal distribution suggesting an atmospheric mercury source south of the...
Tipo: Text
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00041/15221/12677.pdf
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Methyl mercury distributions in relation to the presence of nano- and picophytoplankton in an oceanic water column (Ligurian Sea, North-western Mediterranean) ArchiMer
Heimbuerger, Lars-eric; Cossa, Daniel; Marty, Jean-claude; Migon, Christophe; Averty, Bernard; Dufour, Aurelie; Ras, Josephine.
Recent findings on the distribution of methylated mercury (MeHgT) in waters have highlighted the importance of organic carbon remineralization on the production of these compounds in the open ocean. Here, we present the first time-series (20 monthly samplings between July 2007 and May 2009) of high-resolution vertical profiles (10-12 depths in a 2350 m water column) of MeHgT distributions in an open ocean environment, the Ligurian Sea (North-western Mediterranean Sea). Concentrations varied within the sub-picomolar range (general mean: 0.30 0.17 pmol L-1, n = 214) with the lowest values at the surface, increasing with depth up to the oxygen minimum zone, and decreasing slowly at greater depth. Concentrations in the surface waters never exceeded 0.15 pmol...
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00013/12415/9225.pdf
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RNO. Imposex-TBT. Intensité de la pollution par le tributyletain le long des côtes françaises, de la Manche et de l’Atlantique. Octobre 2004 ArchiMer
Huet, Martial; Averty, Bernard; Paulet, Yves Marie.
Tipo: Text
Ano: 2004 URL: http://archimer.ifremer.fr/doc/00315/42574/41943.pdf
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RNO. Imposex-TBT. La pollution par les organo-stanniques le long des côtes francaises, de la Manche et de l'Atlantique. Novembre 2003 ArchiMer
Huet, Martial; Michel, Pierre; Averty, Bernard; Paulet, Yves Marie.
Tipo: Text
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00315/42572/41942.pdf
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RNO. Imposex-TBT. Suivi annuel de l'imposex le long des côtes françaises. Novembre 2005 ArchiMer
Huet, Martial; Paulet, Yves Marie; Averty, Bernard.
Tipo: Text
Ano: 2005 URL: http://archimer.ifremer.fr/doc/00315/42575/41945.pdf
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Springtime changes in snow chemistry lead to new insights into mercury methylation in the Arctic ArchiMer
Larose, Catheririe; Dommergue, Aurelien; De Angelis, Martine; Cossa, Daniel; Averty, Bernard; Marusczak, Nicolas; Soumis, Nicolas; Schneider, Dominique; Ferrari, Christophe.
Seasonal snow is an active media and an important climate factor that governs nutrient transfer in Arctic ecosystems. Since the snow stores and transforms nutrients and contaminants, it is of crucial importance to gain a better understanding of the dynamics of contaminant cycling within the snowpack and its subsequent release to catchments via meltwater. Over the course of a two-month field study in the spring of 2008, we collected snow and meltwater samples from a seasonal snowpack in Ny-Alesund, Norway (78 degrees 56'N, 11 degrees 52'E), which were analyzed for major inorganic ions and some organic acids, as well as total, dissolved, bioavailable mercury (THg, DHg, BioHg, respectively) and monomethylmercury (MMHg) species. We observe a seasonal gradient...
Tipo: Text
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00018/12904/9880.pdf
Registros recuperados: 12
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