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Auteur  |
Cantet, F.; Hervio-Heath, D.; Caro, A.; Le Mennec, C.; Monteil, C.; Quéméré, C.; Jolivet-Gougeon, A.; Colwell, R.R.; Monfort, P. |
| Titre |
Quantification of Vibrio parahaemolyticus, V. vulnificus and V. cholerae in French Mediterranean coastal lagoons |
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Article scientifique |
| Année |
2013 |
Publication |
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Revue Abrégée |
Research in microbiology |
| Volume |
164 |
Numéro |
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Pages |
867-874 |
| Mots-Clés |
Human pathogen; Lagoons; Sediment; Shellfish; vibrio; water |
| Résumé |
Vibrio parahaemolyticus, Vibrio vulnificus and Vibrio cholerae are human pathogens. Little is known about these Vibrio spp. in the coastal lagoons of France. The purpose of this study was to investigate their incidence in water, shellfish and sediment of three French Mediterranean coastal lagoons using the most probable number-polymerase chain reaction (MPN-PCR). In summer, the total number of V. parahaemolyticus in water, sediment, mussels and clams collected from the three lagoons varied from 1 to >1.1 x 10(3) MPN/l, 0.09 to 1.1 x 10(3) MPN/ml, 9 to 210 MPN/g and 1.5 to 2.1 MPN/g, respectively. In winter, all samples except mussels contained V. parahaemolyticus, but at very low concentrations. Pathogenic (tdh- or trh2-positive) V. parahaemolyticus were present in water, sediment and shellfish samples collected from these lagoons. The number of V. vulnificus in water, sediment and shellfish samples ranged from 1 to 1.1 x 10(3) MPN/l, 0.07 to 110 MPN/ml and 0.04 to 15 MPN/g, respectively, during summer. V. vulnificus was not detected during winter. V. cholerae was rarely detected in water and sediment during summer. In summary, results of this study highlight the finding that the three human pathogenic Vibrio spp. are present in the lagoons and constitute a potential public health hazard. |
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0923-2508 |
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MARBEC @ isabelle.vidal-ayouba @ |
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810 |
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Caro, A.; Chereau, G.; Briant, N.; Roques, C.; Freydier, R.; Delpoux, S.; Escalas, A.; Elbaz-Poulichet, F. |
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Contrasted responses of Ruditapes decussatus (filter and deposit feeding) and Loripes lacteus (symbiotic) exposed to polymetallic contamination (Port-Camargue, France) |
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Article scientifique |
| Année |
2015 |
Publication |
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Revue Abrégée |
Science of The Total Environment |
| Volume |
505 |
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526-534 |
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Bivalves; Clearance rate; DGT (diffusion gradient in thin film technique); genomic content; Metallic pollution; Relative symbiont size |
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Abstract
The use of symbiotic bivalve species to assess the effect of anthropogenic metal pollution was rarely investigated whereas data on filter feeding bivalves are common. The aim of this study was the exposure of two bivalve species, Ruditapes decussatus and Loripes lacteus to polymetallic pollution gradient, originating from harbor activities (Port-Camargue, south of France). Both bivalves differ by their trophic status, filter and deposit feeder for Ruditapes and symbiotic for Loripes that underlies potential differences in metal sensibility. The bivalves were immerged in July (for Ruditapes during 2 and 8 days) and in August 2012 (for Loripes during 2, 6 and 8 days) in the water column of the harbor, at 3 stations according to pollution gradient. Metal concentrations (Cu, Mn, Zn) in the water column were quantified as dissolved metals (measured by ICP-MS) and as labile metals (measured by ICP-MS using DGT technique). For each exposure time, accumulation of metals in the soft tissue of bivalves (“bioaccumulation”) was measured for both species. In addition, specific parameters, according to the trophic status of each bivalve, were investigated: filtering activity (specific clearance rate, SCR) for Ruditapes, and relative cell size (SSC) and genomic content (FL1) of bacterial symbionts hosted in the gills of Loripes. The SCR of Ruditapes drops from 100% (control) to 34.7% after 2 days of exposure in the less contaminated site (station 8). On the other hand, the relative cell size (SSC) and genomic content (FL1), measured by flow cytometry were not impacted by the pollution gradient. Bioaccumulation was compared for both species, showing a greater capability of Cu accumulation for Loripes without lethal effect. Mn, Fe and Zn were generally not accumulated by any of the species according to the pollution gradient. The trophic status of each species may greatly influence their respective responses to polymetallic pollution. |
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0048-9697 |
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MARBEC @ alain.herve @ |
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1284 |
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| Auteur |
Caro, A.; Escalas, A.; Bouvier, C.; Grousset, E.; Lautredou-Audouy, N.; Roques, C.; Charmantier, M.; Gros, O. |
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Epibiotic bacterial community of Sphaeroma serratum (Crustacea, Isopoda): relationship with molt status |
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Article scientifique |
| Année |
2012 |
Publication |
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Revue Abrégée |
Mar. Ecol.-Prog. Ser. |
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457 |
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11-27 |
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16s ribosomal-rna; Crustacean; DGGE band pattern; Epibiotic biofilm; Molt cycle; Sphaeroma; fish; gastropod; gradient gel-electrophoresis; hydrothermal-vent; in-situ hybridization; mid-atlantic ridge; oxidizing bacteria; phylogenetic diversity; riftia-pachyptila; shrimp rimicaris-exoculata; urothoe-poseidonis |
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Sphaeroma serratum is a marine isopod species that inhabits seashores from Europe to West Africa. The individuals live under stones in direct contact with reduced sediments and harbour a diverse bacterial community on the cuticle of their pleopods. We investigated the diversity of these epibiotic bacteria on male (pubescent and senescent) and female specimens with electron microscopic observations and molecular tools. The microbial community of S. serratum was shown to be composed of at least 5 bacterial morphotypes observed on the pleopodal cuticle in all male specimens. Using fluorescence in situ hybridization, we identified 5 major phylogenetic groups (alpha-, beta-, gamma- and delta-Proteobacteria and Archaea) whereas denaturing gradient gel electrophoresis (DGGE) of PCR-amplified 16S rRNA gene fragments of epibiotic bacteria revealed 50 bands. The bacterial community associated with S. serratum seems more diverse than in other marine crustaceans, such as Rimicaris. The relative diversity of this bacterial community was also studied in relation to the molt cycle. The comparison of DGGE band patterns of several individuals from female, pubescent male and senescent male groups revealed that the bacterial community diversity was dependent on the sex and the age of the individuals and more generally on the molt status. |
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English |
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0171-8630 |
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MARBEC @ isabelle.vidal-ayouba @ |
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564 |
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Caro, A.; Got, P.; Bouvy, M.; Troussellier, M.; Gros, O. |
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Effects of long-term starvation on a host bivalve ( Codakia orbicularis , Lucinidae) and its symbiont population |
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Article scientifique |
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2009 |
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Applied and Environmental Microbiology |
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75 |
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10 |
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3304-3313 |
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MARBEC @ isabelle.vidal-ayouba @ |
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548 |
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Chahinian, N.; Bancon-Montigny, C.; Caro, A.; Got, P.; Perrin, J.L.; Rosain, D.; Rodier, C.; Picot, B.; Tournoud, M.G. |
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The role of river sediments in contamination storage downstream of a waste water treatment plant in low flow conditions: Organotins, faecal indicator bacteria and nutrients |
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Article scientifique |
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2012 |
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Estuarine Coastal and Shelf Science |
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114 |
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70-81 |
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Thau lagoon (France); anthropogenic pollution; priority substances; river-coastal lagoon continuum; sediment–water column interactions; water quality |
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0272-7714 |
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MARBEC @ isabelle.vidal-ayouba @ |
collection |
895 |
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