Consulta: creatorFacets:"Geffard, Olivier"
Registros recuperados: 4
Data/hora: 01/06/2024 01:28:26

Relationships between metal bioaccumulation and metallothionein levels in larvae of Mytilus galloprovincialis exposed to contaminated estuarine sediment elutriate
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Geffard, A; Geffard, Olivier; His, Edouard; Amiard, Jc.
The bioavailability of Cd, Cu and Zn from a metal-contaminated sediment was studied using Mytilus galloprovincialis embryos and larvae exposed to sediment elutriates, The elutriate concentrations tested were always lower than the threshold at which abnormal larval development appears. The Cd, Cu and Zn contents of the sediment, of the elutriate and of the larvae, as well as the larval growth, the condition index (CI), and the induction of metallothionein (NIT) in the larvae were measured. The Cl was only affected after 96 h of exposure, principally at the highest elutriate concentration (25%, corresponding to 0.1435 mug Cd l(-1) and 14 mug Zn l(-1)). Cd, Cu and Zn bioaccumulation was observed (48 and 96 h), in whole larvae as well as in the cytosolic...
Tipo: Text
Palavras-chave: Sediment elutriate; Mytilus galloprovincialis larvae; Metal bioaccumulation; Metallothionein.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00000/10119/7598.pdf

Amélioration de la qualité chez l'huître creuse Crassostrea gigas par sélection de souches performantes - Contrat de Plan Etat Région Poitou-Charentes 1994-1998 - Rapport année 1995
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Boudry, Pierre; Naciri, Yamama; Heral, Maurice; Collet, Bertrand; Bougrier, Serge; Geffard, Olivier; Ledu, Christophe; Phelipot, Pascal; Heurtebise, Serge; Gerard, Andre.
Le programme de recherche présenté ci-dessous est le fruit d'une réflexion conjointe entre généticiens et physiologistes afin de mettre sur pied un ensemble d'expériences permettant d'étudier les bases génétiques de la variabilité des caractères impliqués dans la croissance chez l'huître creuse, Crassostrea gigas.
Tipo: Text
Palavras-chave: Génétique; Sélection génétique; Génétique des populations; Croissance; Crassostrea gigas.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/00044/15518/12905.pdf

Biomarkers as tools for monitoring within the Water Framework Directive context: concept, opinions and advancement of expertise
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Milinkovitch, Thomas; Geffard, Olivier; Geffard, Alain; Mouneyrac, Catherine; Chaumot, Arnaud; Xuereb, Benoit; Fisson, Cedric; Minier, Christophe; Auffret, Michel; Perceval, Olivier; Egea, Emilie; Sanchez, Wilfried.
The Water Framework Directive (WFD) currently supports chemical and ecological monitoring programmes in order to achieve the good water surface status. Although chemical and ecological assessments are necessary, they have some limitations. Chemical approaches focus on certain substances identified as priorities, but they do not take into account other potentially harmful substances and also ignore the hazards related to contaminant cocktails. On the other hand, while ecological approaches provide holistic information on the impairment of biological communities in ecosystems, they do not distinguish the role of contaminants in these alterations, and consequently do not allow the establishment of contaminant impact reduction plans. Consequently,...
Tipo: Text
Palavras-chave: Biomarkers; Ecotoxicology; Water Framework Directive; Biomonitoring strategy; Contaminants.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00605/71662/73085.pdf

Toxicite potentielle des sediments marins et estuariens contamines : evaluation chimique et biologique, biodisponibilite des contaminants sedimentaires
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Geffard, Olivier.
Marine and estuarine sediments concentrate various pollutants. Thus, they can constitute a risk of contamination for aquatic organisms, and cause a public health problem. The potential toxicity of various sediments was studied by different bioassays and by assessing the bioavailability of polycyclic aromatic hydrocarbons (PAH) and metals they contained. Among the various stages of development investigated in oysters, Crassostrea gigas, and in sea urchins, Paracentrotus lividus, oyster embryos and larvae proved to be the most sensitive and useful tool for the evaluation of sediment effects on benthic organisms (whole sediment treatment ; embryotoxicity test) as well as on pelagic species (elutriate treatment; embryotoxicity and larval growth tests)....
Tipo: Text
Palavras-chave: Biomonitoring Food chain Metallothioneine Bioaccumulation; Bioavailability Mytilus galloprovincialis Paracentrotus lividus Crassostrea gigas In situ bioassays Laboratory bioassays Metals PAHs Elutriate Whole sediment Biomonitoring Chaîne trophique Métallothionéine Bioaccumulation Bodisponibilité Mytilus galloprovincialis Paracentrotus lividus Crassostrea gigas Bioessais in situ Bioessais en laboratoire métal HAP Elutriate Sédiment contact.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/these-1482.pdf