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| Registros recuperados: 43 | |
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| Blanchard, Michel; Le Saux, Jean-claude; Piriou, Jean-yves. |
| Un recensement des apports provenant de certains bassins versants dans l'estuaire de l'Aber-Benoît (Bretagne-nord, France) montre que les contaminants susceptibles d'affecter la qualité de l'eau alimentant les huîtres sont de natures diverses. Parmi les éléments étudiés, les mesures donnent des flux minima journaliers de 10(13) coliformes fécaux, 2 tonnes d'azote, 150 kilogrammes de phosphate sur l'estuaire, et 27 grammes de triazines, pesticides les plus importants sur la rivière Aber-Benoît. |
| Tipo: Text |
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| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00082/19285/16880.pdf |
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| Blanchard, Michel; Hamon, Dominique. |
| The slipper-limpet (Crepidula fornicata) is a marine gastropod which causes serious perturbations in shellfish beds, because of spatial spreading and density rising. Along French coasts, in Northern Brittany, two bays are highly colonized : bay of Saint-Brieuc, centre for scallops fishery, and bay of Mont-Saint-Michel, a famous oyster-farming area, with a total limpet stock about 450 000 metric tons. The association AREVAL was founded in 2001 to manage there, an industrial collect of limpets by a succing-dredge, followed ashore by a treatment for calcareous soil improvement. The scientific survey, contracted to IFREMER, included measurements of long andshort-term dredge's effects on grounds and limpet population, and proposals to set up dredging... |
| Tipo: Text |
Palavras-chave: France; Western Channel; Bay of Mont Saint Michel; Bay of Saint Brieuc; Impact; Dredging; Treatment; Crepidula fornicata; Slipper limpet; Manche Ouest; Baie du Mont Saint Michel; Baie de Saint Brieuc; Impact; Dragage; Exploitation; Crepidula fornicata; Crépidule. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/rapport-6301.pdf |
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| Blanchard, Michel; Pechenik, J; Giudicelli, E; Connan, Jean-paul; Robert, Rene. |
| The degree to which larvae of the invasive American slipper limpet (Crepidula fornicata) and the Japanese oyster (Crassostrea gigas) may compete for food was examined during 2003 in the laboratory. Larval microalgae uptake, growth and mortality were compared for larvae fed each of six species of unicellular algae, ranging in length from 2 to 10 mu m. Tested diets included the two flagellates Tetraselmis chui (Prasinophyceae) and Isochrysis affinis galbana (T-ISO, Haptophyceae), one member of the Chlorophyceae (Nannochloris atomus), and three diatom species (Chaetoceros calcitrans forma pumilum, Chaetoceros gracilis, Skeletonema marino). We found that the limpet larvae ingested phytoplankton over a wider range of cell sizes and ate at higher rates on each... |
| Tipo: Text |
Palavras-chave: Larvae; Crepidula fornicata; Crassostrea gigas Growth Feeding rate Diet Phytoplankton. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4703.pdf |
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| Blanchard, Michel. |
| A population dynamic study has been carried out on slipper-limpet Crepidula fornicata, in the bay of Mont-Saint-Michel (Brittany, France), for the National Program for Coastal Environment (Programme National d'Environnement Côtier - P.N.E.C.), from samples collected between February and October 2002. Analysis were done on sexuality, reproduction, growth and production. In this population, we observe twice more males than females, which is the consequence of an active reproduction and a sign of a continuous spread. Our results show that the laying period runs from February to October, with two or three main peaks corresponding to a significant rise in water temperature. All females lay eggs in May, but the results demonstrate that the oldest females also... |
| Tipo: Text |
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| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/rapport-5900.pdf |
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| Blanchard, Michel; Blanchet, Aline; Gaffet, Jean-dominique; Hamon, Dominique. |
| The limpet (Crepidula fornicata), a gastropod mollusc belonging to the Calyptraeidae, native of the Atlantic coast of northern America, was introduced by accident on the French coasts in different steps (Blanchard, 1995, 1997). The most important, at the beginning of the 1970s, is linked to the massive importation of the Japanese oyster (Crassostrea gigas), in replacement of the Portuguese oyster (Crassostrea angulata), decimated by an epizooty. It is an opportunistic species proliferating in the neighbourhood of the main oyster basins of the English Channel and the Atlantic Ocean. Such is the case of the oyster culture areas of the Norman-Breton Gulf where stock assessments accounted for hundreds of thousands of tonnes of them (Hamon and Blanchard, 1994;... |
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| Ano: 2001 |
URL: https://w3.ifremer.fr/archimer/doc/00000/5305/ |
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| Blanchard, Michel. |
| L'élimination de la crépidule est une préoccupation majeure de la part de nombreux ostréiculteurs. Que leurs concessions soient sous 10 mètres d'eau, comme à Cancale, ou sur l'estran, elles sont de plus en plus envahies par ce gastéropode proliférant. Les professionnels sont obligés de procéder à de fréquents nettoyages. Le problème qui se pose alors est le devenir du produit ainsi débarqué. Très peu de solutions intéressantes sont actuellement proposées, en dehors de l'écrasement et de l'enfouissement dans les terrains agricoles, pour la culture des primeurs comme cela se pratique au Vivier-sur-Mer. Le rejet au large, par grande profondeur, est une solution qui fut proposée par des ostréiculteurs charentais. Les crépidules immergées par des fonds de 2000... |
| Tipo: Text |
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| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00102/21312/18931.pdf |
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| Blanchard, Michel; Gros, Philippe. |
| Three main intertidal macrofauna communities are identified in Saint-Brieuc Bay: a Macoma balthica community, a Tellina tenuis community; and a third community with Cerastroderma and Tellina tenuis. Physiological parameters such as filtration, respiration and excretion are examined, for the filter-feeding molluscs with the highest biomass (the cockle Cerastoderma edule, the tellinid Tellina tenuis, and the blue mussel Mytilus edulis), either through laboratory experiments, or through previous literature. These results are used together to build up an annual energy budget for the complete soft bottom community, and to observe trophic relations. Results show that the mussel population has a negative influence on the cockle beds that lie just above. |
| Tipo: Text |
Palavras-chave: ENERGY BUDGET; FLUXES; CERASTODERMA-EDULE; TELLINA-TENUIS; SAINT-BRIEUC BAY. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00100/21132/18752.pdf |
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| Blanchard, Michel. |
| This document is the third volume of a bibliographical survey of some of the species studied by IFREMER Brest's Coastal Environment Department (DEL) on a regular basis. The studied animals are a selection of characteristic community species (ex: Lanice or Abra) or populations whose density is so large that they are the ideal material for a regular pluri-annual study (ex: Nucule). For some of them, a regular geographical distribution along the Channel coasts, can be another reason for their selection. On the one hand, for some species, which can be easily reached on the tidal zone, works are numerous and documentation heavy, especially in the ethology field (building of tube of Lanice, displacement of Patelle) On the other hand, documentation, if any, is... |
| Tipo: Text |
Palavras-chave: Bentic; Coastal species; Plankton; English Channel sea; Tapes rhomboides; Spisula ovalis; Abra alba; Glycymeris glycemeris; Nucula nucleus; P. intermedia; P. aspera; Patella vulgata; Lanice conchilega; Benthiques; Espèces littorales; Plancton; Manche; Tapes rhomboides; Spisula ovalis; Abra alba; Glycymeris glycemeris; Nucula nucleus; P. intermedia; P. aspera; Patella vulgata; Lanice conchilega. |
| Ano: 1985 |
URL: http://archimer.ifremer.fr/doc/1985/rapport-3697.pdf |
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| Blanchard, Michel. |
| Laboratory experiments on physiological parameters, have been performed, in order to obtain the Scope For Growth, of six species of marine bivalves. Between March 1988 and April 1989, intertidal and subtidal individuals, collected in the Bay of SAINT-BRIEUC, have been submitted to the analysis. Among them, LAEVICARDIUM CRASSUM, ACANTHOCARDIA ECHINATA, TAPES RHOMBOIDES and CORBULA GIBBA, were collected in the subtidal area, and CERASTODERMA EDULE, TELLINA TENUIS on intertidal flats. Results show similar patterns for the first three species mentioned above, but they exibit large variability for the other species studied, due to some heterogeneity in their size, habitat and egestion rate. Results obtained from laboratory experiments have been generalised to... |
| Tipo: Text |
Palavras-chave: Bilan énergétique; Baie de SAINT; BRIEUC; Mollusques Bivalves; Scope For Growth; Bay of SAINT; BRIEUC; Bivalves Molluscs. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00102/21315/18935.pdf |
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| Quiniou, Francoise; Blanchard, Michel; Bocquene, Gilles; Burgeot, Thierry; Giboire, Louis; His, Edouard; Le Du, Anne. |
| La présente étude a pour objectif de sélectionner des méthodes de laboratoire et de terrain les mieux appropriées pour l'évaluation de l'écotoxicité de sédiments dragués : indicateurs biochimiques d'exposition (EROD et AChE), tests de toxicité sublétale (micro-organismes, algues, embryons de bivalve et extrait enzymatiques de poisson), indices physiologiques de bivalve (respiration, excrétion, mouvements valvaires). Une synthèse des résultats est présentée accompagnée, en annexes, des rapports des différents participants à l'étude. |
| Tipo: Text |
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| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00104/21573/19153.pdf |
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| Registros recuperados: 43 | |
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