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Registros recuperados: 12
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Bilan des études méthodologiques 2007 pour le projet d'analyse des risques de mortalité d'huîtres en baie de Quiberon ArchiMer
Fleury, Pierre-gildas; Bouget, Jean-francois; Langlade, Aime; Mazurie, Joseph; Philippon, Xavier.
(subtidal on-bottom rearings), has been the year of the gestation for the RISCO-QB project (Risks in shellfish farming, in baie de Quiberon). Discussions with various potential partners have resulted in the project drafting with 3 main objectives : - estimation of the trophic capacity of the bay and adjustment of the rearing biomass, - impact of sediment nearness upon on-bottom technique and adjustment of the rearing practices, - appraisal of the impact of these 2 factors (trophic capacity and sediment nearness) on the budget of the farming companies and their consequences in the management of the mortality risk. Concurrently with the project writing, pre-studies, mainly methodological, have been conducted in the bay since 2007 in order to investigate the...
Tipo: Text
Ano: 2008 URL: http://archimer.ifremer.fr/doc/00075/18674/16220.pdf
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Comparison of C and N stable isotope ratios between surface particulate organic matter and microphytoplankton in the Gulf of Lions (NW Mediterranean) ArchiMer
Harmelin Vivien, M; Loizeau, Veronique; Mellon-duval, Capucine; Beker, B; Arlhac, D; Bodiguel, Xavier; Ferraton, Franck; Hermand, R; Philippon, Xavier; Salen Picard, C.
Carbon and nitrogen stable isotope ratios of particulate organic matter (POM) in surface water and 63-200 mu m-sized microphytoplankton collected at the fluorescence maximum were studied in four sites in the Gulf of Lions (NW Mediterranean), a marine area influenced by the Rhone River inputs, in May and November 2004. Some environmental (temperature, salinity) and biological (POM, Chlorophyll a and phaeopigments contents, phytoplankton biomass and composition) parameters were also analysed. Significantly different C and N isotopic signatures between surface water POM and microphytoplankton were recorded in all sites and seasons. Surface water POM presented systematically lower delta C-13 (similar to 4.2 parts per thousand) and higher delta N-15 (similar to...
Tipo: Text Palavras-chave: Seasonal variation; PON/Chl a; C/N ratio; Stable isotopes; Fluorescence maximum; Phytoplankton composition; Particulate organic matter.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-5919.pdf
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Coupling and Decoupling of benthic elemental cycles (P, Si) along the salinity gradient of a subtidal temperate estuary : results from measurements and modeling. ArchiMer
Raimonet, Melanie; Ragueneau, Olivier; Andrieux-loyer, Francoise; Khalil, Karima; Kerouel, Roger; Philippon, Xavier; Soetaert,, Karline; Rabouille, Christophe; Memery, Laurent.
Tipo: Text
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00058/16909/14382.pdf
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Impact of Oyster Farming on Diagenetic Processes and the Phosphorus Cycle in Two Estuaries (Britanny, France) ArchiMer
Andrieux, Francoise; Azandegbe, Afi; Caradec, Florian; Philippon, Xavier; Kerouel, Roger; Youenou, Agnes; Nicolas, Jean-louis.
This study aims to compare the impact of oyster cultures on diagenetic processes and the phosphorus cycle in the sediments of the Aber Benoît and the Rivière d’Auray, estuary of Brittany, France. Our results showed clear evidence of the seasonal impact of oyster cultures on sediment characteristics (grain size, organic matter parameters), and the phosphorus cycle, especially in the Aber Benoît. At this site, seasonal variations of sulfide and Fe concentrations in pore waters, as well as Fe-P concentrations in the solid-phase highlighted a shift from a system governed by iron reduction (Reference) to a system governed by sulphate reduction (Beneath Oyster). This could be partly explained by the increase in labile organic matter (ie, biodeposits) beneath...
Tipo: Text Palavras-chave: Sediment; Phosphorus; Sulfide; Dissolved Fe/P ratios; Labile organic matter; Oyster cultures.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00209/32003/30441.pdf
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Influence of oyster culture on biogeochemistry and bacterial community structure at the sediment-water interface ArchiMer
Azandegbe, Afi; Poly, Franck; Andrieux, Francoise; Kerouel, Roger; Philippon, Xavier; Nicolas, Jean-louis.
Bacterial community structure and some biogeochemical parameters were studied in the sediment of two Pacific oyster farming sites, Aber Benoît (AB) and Rivière d'Auray (RA) in Brittany (France), to examine the ecological impact of oysters and to evaluate the emission of sulfide and ammonia from sediment. At AB, the organic matter accumulated in the sediment beneath the oyster tables was rapidly mineralized, with strong fluxes of ammonia and sulfide that reached 1014 μmol m−2 h−1 - and 215 μmol m−2 h−1, respectively, in June 2007. At RA, the fluxes were about half as strong on average and better distributed through the year. The ammonia and sulfide concentrations in the overlying water never reached levels that would be toxic to oysters in either site, nor...
Tipo: Text Palavras-chave: Sediment; Biogeochemical parameters; Fluxes; Bacterial structure; Crassostrea gigas.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00079/19010/17083.pdf
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Influence of sex, maturity and reproduction on PCB and p,p ' DDE concentrations and repartitions in the European hake (Merluccius merluccius, L.) from the Gulf of Lions (NW Mediterranean) ArchiMer
Bodiguel, Xavier; Loizeau, Veronique; Le Guellec, Anne-marie; Roupsard, Francois; Philippon, Xavier; Mellon-duval, Capucine.
The main objective of this work was to establish the influence of sex, maturity and reproduction on the contamination of the demersal fish Merluccius merluccius by organochlorine compounds. Polychlorinated biphenyls (PCBs) and p,p'DDE were quantified in muscle, liver and gonads of female and male hakes collected in the Gulf of Lions in 2004 and 2005. Observed levels appeared higher than the population of the Bay of Biscay and lower than the population of the Thyrrenian Sea. Contaminant fingerprints were roughly constant whatever the studied organ and the hake biological condition. Concentrations varied significantly according to the sex and maturity of hakes. Mature specimens were more contaminated than immature, and males presented higher levels than...
Tipo: Text Palavras-chave: Bioaccumulation PCBs p; P ' DDE Merluccius merluccius Demersal fish Mediterranean Sea.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00000/11129/9317.pdf
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Occurrence and seasonality of Vibrio aestuarianus in sediment and Crassostrea gigas haemolymph at two oyster farms in France ArchiMer
Azandegbe, Afi; Gamier, Matthieu; Andrieux, Francoise; Kerouel, Roger; Philippon, Xavier; Nicolas, Jean-louis.
Vibrio aestuarianus is frequently found in coastal areas and can infect and induce mortalities in the pacific oyster Crassostrea gigas. However, nothing is known about its distribution and seasonality in the estuarine environment, especially where oyster farming is practiced. Its occurrence was investigated in sediment and oyster haemolymph at 2 oyster farms in Brittany (France) over 2 yr during 2 periods, from June to September 2007 and from February to June 2008. Total heterotrophic bacteria (HB) were cultured on marine agar while total Vibrio spp. and V. aestuarianus were selectively numerated using thiosulfate citrate bile salts sucrose agar (TCBS agar) and the species-specific hybridisation method, respectively. PCR was performed to detect V....
Tipo: Text Palavras-chave: Vibrio aestuarianus; Crassostrea gigas Sediment; Seasonal abundance; Colony-blot.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00017/12813/9756.pdf
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Organochlorinated contaminants in decapod crustaceans from the coasts of Brittany and Normandy (France) ArchiMer
Bodin, Nathalie; Abarnou, Alain; Le Guellec, Anne-marie; Loizeau, Veronique; Philippon, Xavier.
The contamination and distribution of organ ochlorinated compounds were considered in three crustacean species (edible crab, Cancer pagurus; spider crab, Maja brachydactyla; velvet swimming crab, Necora puber) from five sites along the coasts of Brittany and Normandy (Western and North-Western France). PCBs (16 single congeners), pp'-DDE and HCB were measured in hepatopancreas, gonads and muscle: in all, 175 samples were analysed. The spider crab was the only species found in the five sampling sites, thus enabling comparison between areas. Specimens from Antifer were much more contaminated (Sigma(16)PCBs in hepatopancreas = 2000-4000 ng g(-1) dry weight) than those from other sites (50-1000 ng g(-1) d.w.). Among all the three species, the spider crab...
Tipo: Text Palavras-chave: Human diet; France; Brittany; Normandy; Crustaceans; Polychlorobiphenyls.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2594.pdf
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PCB, PCDD/F and PBDE levels and profiles in crustaceans from the coastal waters of Brittany and Normandy (France) ArchiMer
Bodin, Nathalie; Abarnou, Alain; Fraisse, D; Defour, S; Loizeau, Veronique; Le Guellec, Anne-marie; Philippon, Xavier.
Polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs) and polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) were analysed in the muscle of various edible marine crustaceans (spider crab, edible crab, velvet swimming crab and Norway lobster) from the Brittany and Normandy coasts (France). The highest concentrations were measured in species collected from Antifer (Seine Bay). PCB and PBDE patterns in crustacean muscles were similar and independent of the geographical area with the predominance of the high chlorinated PCBs (CB 15 3, 138, 118 and 180), and of a few PBDE congeners (BDE47, BDE99, WE 100 and BDE28). Oppositely, dioxin contamination differed with site. The major component in crustaceans from the Seine Bay was...
Tipo: Text Palavras-chave: France; Food safety; Metabolisation; Decapod crustaceans; PBDEs; PCDD/Fs; PCBs.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2685.pdf
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Phosphorus dynamics and bioavailability in sediments of the Penze Estuary (NW France): in relation to annual P-fluxes and occurrences of Alexandrium Minutum ArchiMer
Andrieux-loyer, Francoise; Philippon, Xavier; Bally, Gabriel; Kerouel, Roger; Youenou, Agnes; Le Grand, Jacqueline.
The macrotidal estuary of Penze (Brittany, Western part of the Channel, France) has been subjected to recurrent annual toxic blooms of Alexandrium minutum since 1988. This study aims to specify the phosphorus dynamics and bioavailability in sediments in order to improve our understanding of Alexandrium occurrences. Sediment-P pools and diffusive phosphate fluxes were studied under similar hydrodynamic conditions, in the intermediate estuary in May, June and July 2003 and along the salinity gradient from August 2004 to June 2005. The results highlight a decrease in bioavailable phosphorus (iron and organic bound) from the inner part of the estuary seaward. The ratio of iron-bound phosphorus to iron-oxyhydroxides is lower in the inner and intermediate...
Tipo: Text Palavras-chave: Sequential extraction; Sediment phosphorus; Pore water; Phosphate fluxes; Estuary; Alexandrium minutum.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4306.pdf
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Spatio-temporal variability in benthic silica cycling in two macrotidal estuaries: Causes and consequences for local to global studies ArchiMer
Raimonet, Melanie; Ragueneau, Olivier; Andrieux Loyer, Francoise; Philippon, Xavier; Kerouel, Roger; Le Goff, Manon; Memery, Laurent.
The high heterogeneity of silica cycling in coastal margins and the lack of silica data (compared to nitrogen and phosphorus) prevent the estimation of global silica retention in estuaries. In this study, the spatial and temporal variability of porewater silicic acid (Si(OH)4) profiles e that integrate benthic transport and reaction processes e was investigated at different spatial (metre, longitudinal and crosssection, intra-estuary) and temporal (tidal, seasonal) scales in two macrotidal estuaries, very close geographically but essentially differing in their shape. Studying the spatial and temporal variability of Si(OH)4 concentrations in porewaters provided evidence for the importance of transport processes, e.g. bio-irrigation, tidal pumping,...
Tipo: Text Palavras-chave: Heterogeneity; Season; Silicate; Sediment; Land-sea interface; Upscaling.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00124/23529/22370.pdf
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Strong gradient of benthic biogeochemical processes along a macrotidal temperate estuary: focus on P and Si cycles ArchiMer
Raimonet, Melanie; Andrieux, Francoise; Ragueneau, Olivier; Michaud, Emma; Kerouel, Roger; Philippon, Xavier; Nonent, Michel; Memery, Laurent.
Tipo: Text Palavras-chave: Early diagenesis; Silicate; Phosphate; Authigenic phosphorus; Macrotidal; Estuary.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00130/24115/22493.pdf
Registros recuperados: 12
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