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Registros recuperados: 4
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A multitracer approach to assess the spatial contamination pattern of hake (Merluccius merluccius) in the French Mediterranean ArchiMer
Cresson, Pierre; Bouchoucha, Marc; Morat, Fabien; Miralles, Francoise; Chavanon, Fabienne; Loizeau, Veronique; Cossa, Daniel.
Chemical contamination levels and stable isotope ratios provide integrated information about contaminant exposure, trophic position and also biological and environmental influences on marine organisms. By combining these approaches with otolith shape analyses, the aim of the present study was to document the spatial variability of Hg and PCB contamination of the European hake (Merluccius merluccius) in the French Mediterranean, hypothesizing that local contaminant sources, environmental conditions and biological specificities lead to site-specific contamination patterns. High Hg concentrations discriminated Corsica (average: 1.36 ± 0.80 μg g− 1 dm) from the Gulf of Lions (average values < 0.5 μg g− 1 dm), where Rhône River input caused high PCB burdens....
Tipo: Text Palavras-chave: Hg; Mediterranean; Merluccius merluccius; Multiple ecotracers; PCB.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00270/38155/36309.pdf
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Etude sur les risques de contamination microbiologique des oursins ArchiMer
Chavanon, Fabienne; Bouchoucha, Marc.
L’objet principal de cette étude est d’évaluer et suivre les niveaux de contamination des oursins dans un secteur identifié comme exposé aux sources de contamination microbiologique, afin de vérifier l’hypothèse selon laquelle les oursins, organismes brouteurs et non filtreurs, sont peu ou pas sensibles à la contamination microbiologique par rapport à des coquillages du groupe III.Les résultats des analyses montrent que pour cette zone classée A par arrêté préfectoral, les oursins, sont susceptibles d’être fortement contaminés lors de pollutions bactériologiques.La contamination peut être plus importante que dans les moules, organismes filtreurs.
Tipo: Text Palavras-chave: Microbiologie; Classement de zone; Oursin.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00170/28147/26378.pdf
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Faecal contamination of echinoderms: first report of heavy Escherichia coli loading of sea urchins from a natural growing area ArchiMer
Bouchoucha, Marc; Piquet, Jean-come; Chavanon, Fabienne; Dufresne, C.; Le Guyader, Soizick.
Although little evidence existed to support that view, European countries and in particular France, have regarded echinoderms, including sea urchins, as low risk in terms of feacal contamination. It is hypothesized that the sea urchins mode of feeding, which is based on grazing and differs from bivalve molluscs, would prevent it from concentrating high levels of Escherichia coli. Here, we monitored E. coli levels in sea urchins (Paracentrotus lividus) and in filter-feeder mussels (Mytillus galloprovincialis), collected concurrently from the same natural area over a 1-year period to verify this assumption. Sea urchins were collected on the seafloor, whereas mussels were collected from the water column at a depth of 4 m. Our results showed heavy bacterial...
Tipo: Text Palavras-chave: E. coli; Fecal contamination; Mussel; Sea urchin; Shellfish monitoring program.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00310/42086/41400.pdf
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Mercury in organisms from the Northwestern Mediterranean slope: Importance of food sources ArchiMer
Cresson, Pierre; Fabri, Marie-claire; Bouchoucha, Marc; Brach-papa, Christophe; Chavanon, Fabienne; Jadaud, Angelique; Knoery, Joel; Marco-miralles, Francoise; Cossa, D..
Mercury (Hg) is a global threat for marine ecosystems, especially within the Mediterranean Sea. The concern is higher for deep-sea organisms, as the Hg concentration in their tissues is commonly high. To assess the influence of food supply at two trophic levels, total Hg concentrations and carbon and nitrogen stable isotope ratios were determined in 7 species (4 teleosts, 2 sharks, and 1 crustacean) sampled on the upper part of the continental slope of the Gulf of Lions (Northwestern Mediterranean Sea), at depths between 284 and 816 m. Mean Hg concentrations ranged from 1.30 ± 0.61 to 7.13 ± 7.09 μg g− 1 dry mass, with maximum values observed for small-spotted catshark Scyliorhinus canicula. For all species except blue whiting Micromesistius poutassou, Hg...
Tipo: Text Palavras-chave: Continental slope; Trophic webs; Depth; Teleosts; Sharks; Stable isotopes.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00206/31759/30693.pdf
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