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Registros recuperados: 39
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Apports des bassins versants dans l'estuaire de l'Aber-Benoît ArchiMer
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.
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Ano: 1993 URL: http://archimer.ifremer.fr/doc/00082/19285/16880.pdf
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Bilan du suivi de l'exploitation industrielle de la crépidule en Bretagne Nord (baies de Saint-Brieuc et du Mont Saint-Michel) 2002-2005 ArchiMer
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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Bilan energetique de la population de coque (Cerastoderma edule ) en baie de Saint-Brieuc, Manche Ouest ArchiMer
Blanchard, Michel.
During one year, from March 1988 to June 1989, the intertidal population of Cerastoderma edule in the Bay of Saint-Brieuc, is investigated. Physiological measurements (ingestion, egestion, respiration and excretion) are monthly carried out in laboratory. We observe that reproductive metabolism influences the results. The energy budget of this cockle population, based on a biomass and production estimate for a 15 x 10 super(6) sq.m. area, is calculated and discussed.
Tipo: Text Palavras-chave: ANE; France; Brittany; St. Brieuc Bay Cerastoderma edule Bivalvia Marine molluscs Experimental research Excretion Ingestion Temperature Oxygen consumption Respiration Animal physiology Biomass Energy budget.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/1991/acte-1716.pdf
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Cartographie et évaluation des principaux mollusques filtreurs du Golfe Normano-Breton ArchiMer
Noel, Philippe; Blanchard, Michel; Berthou, Patrick.
During 1993 and 1994, quantitative sampling were realized in Norman Gulf (Western Channel) to estimate molluscs suspension-feeders. Four bivalves are regularly sampled : Spisula ovalis, Tapes rhomboides, Glycymeris glycymeris and Venus verrucosa. For each species, individual age and weight were noticed. The spreading gastropod Crepidula fornicata was also sampled. The resultant biomass and distribution are proposed. These results will contribute to the evaluation of trophic exchanges in boundary layer and to the proposed modeling, in the program PNOC (National Program for Coastal Oceanography). NOT CONTROLLED OCR
Tipo: Text Palavras-chave: Western Channel; Norman Gulf; Crepidula fornicata; Venus verrucosa; Glycymeris glycymeris; Tapes rhomboides; Spisula ovalis; Suspension feeders; Cartography; Estimation; Manche Ouest; Golfe Normano Breton; Crepidula fornicata; Venus verrucosa; Glycymeris glycymeris; Tapes rhomboïdes; Spisula ovalis; Suspensivores; Cartographie; Evaluation.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/1995/rapport-3856.pdf
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Cartographie et évaluation du stock de crépidules en baie du Mont Saint-Michel, en 2004 ArchiMer
Blanchard, Michel; Clabaut, Philippe; Abernot-le Gac, Chantal.
In 2003 and 2004, 3 cruises were organized using observations systems and sampling techniques to carry out cartography and stock assessment of the Slipper-limpet population (Crepidula fornicata) in the bay of Mont-Saint-Michel (Western Channel). This was done as part of the National Programme of Coastal Environment (Programme National d'Environnement Côtier - PNEC). The study helped to update previous data collected in 1995-96 with similar techniques : side-scan-sonar and submarine video for observation, and scuba diving and grabs for samples collection. Results show that during an eight years period, the limpet population spread in the southern part of the bay and that its stock rose about 50%, reaching about 150,000 metric tons, south of a...
Tipo: Text Palavras-chave: Manche ouest; Golfe normano breton; Baie du Mont Saint Michel; Sonar à balayage latéral; Cartographie; Évaluation de stock; Crepidula fornicata; Crépidule; Western Channel; Norman Gulf; Bay of Mont Saint Michel; Side scan sonar; Cartography; Stock assessment; Crepidula fornicata; Slipper limpet.
Ano: 2006 URL: https://archimer.ifremer.fr/doc/2006/rapport-5901.pdf
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Cartographie synthétique et analyse des peuplements benthiques sur deux secteurs du littoral français "Manche-Est" et "Loire-Gironde" ArchiMer
Blanchard, Michel; Heim, Marie; Rozec, Xavier; Caisey, Xavier.
This document presents a synthetic study of benthos in two large areas of the French coast: East-Channel and the area between Loire and Gironde. This original synthesis stocktakes biotopes maps published for the vast majority in the 70’s. The report uses the previous descriptions and analysis done by the different authors, and translates them with present specific names or biotopes codes, as proposed in the European EUNIS referring system. The presented maps are standardized and referred geographically with WGS84 to be collated together. For each biotope, specific richness and ecological richness are analysed, thanks to the information given by the various authors. Some informative cards of the main representative species are also presented in the...
Tipo: Text Palavras-chave: Benthos; Peuplement; Cartographie; Littoral français; Manche Est; Bretagne sud; Vendée; Pertuis charentais; Golfe de Gascogne; Benthos; Community; Cartography; French coast; East Channel; Southern Brittany; Vendée; Pertuis charentais; Bay of Biscay.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/00003/11434/7983.pdf
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Competition for food in the larvae of two marine molluscs, Crepidula fornicata and Crassostrea gigas ArchiMer
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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Crepidula fornicata : cartographie d’une invasion ArchiMer
Blanchard, Michel; Loarer, Ronan; Jarriault, Romain.
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00028/13949/11122.pdf
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Détermination de l'âge de Crepidula fornicata (mesogasteropode calyptraeide) par mesure isotopique ArchiMer
Blanchard, Michel; Vergnaud - Grazzini, Colette.
To valid the current method of counting the external growth bands of the shell, a new method is tested using isotopie analysis for carbon and oxygen in the shell compounds. Our results valid the current method whith observation of oxygen isotope only. Carbon analysis gives a drift after the fourth band, because of other various parameters.
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Ano: 1995 URL: http://archimer.ifremer.fr/doc/00040/15128/12465.pdf
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Dynamique de la population de crépidule (Crepidula fornicata) en Baie du Mont Saint-Michel ArchiMer
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...
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Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/rapport-5900.pdf
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Dynamique de population de la crépidule (Crepidula fornicata) en baie de Saint-Brieuc (Manche-Ouest) ArchiMer
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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Effets de la pression barométrique sur la crépidule (Crepidula fornicata) ArchiMer
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...
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Ano: 1994 URL: http://archimer.ifremer.fr/doc/00102/21312/18931.pdf
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Estimation des flux engendrés par l'activité métabolique des mollusque filtreurs intertidaux en baie de Saint-Brieuc ArchiMer
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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Etat de la prolifération de la crépidule (Crepidula fornicata) en baie de Saint-Brieuc. ArchiMer
Hamon, Dominique; Blanchard, Michel.
The aim of this report is to provide an original method of mapping slipper limpet beds in the bay of Saint-Brieuc (Western Channel) by means of side scan sonar and submarine video. An evaluation of the biomass completes the distribution of limpets. The total fresh weight is about 250 000 tons
Tipo: Text Palavras-chave: Baie de Saint-Brieuc; Crepidula fornicala; Sonar latéral; Vidéo sous-marine; Cartographie; Biomasse; Bay of Saint-Brieuc. Crepidula fornicata; Side scan sonar; Submarine video; Cartographv; Biomass.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00107/21790/19365.pdf
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Etat de la prolifération de la crépidule (Crepidula fornicata L.) dans le secteur de Granville (Golfe Normano-Beton - 1985) ArchiMer
Quiniou, Francoise; Blanchard, Michel.
An area located between the Mont-St-Michel Bay and Jersey was monitored from 1984 to 1985. Limpet densities have been evaluated through quantitative sampling and underwater video. At the same time, some planktonic samplings have enabled the monitoring of the evolution of larval abundances. Maxima, planktonic and benthic density areas superpose each other. Moreover, the study of the populations shows that the number of young colonies is increasing, thus clearly indicating that Crepidula fornicata populating is booming in the Norman-Breton gulf.
Tipo: Text Palavras-chave: Evolution; Distribution spatiale; Golfe Normano breton; Adulte; Larve; Crepidula fornicata.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/1986/acte-6190.PDF
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Etude bibliographique de quelques espèces planctoniques et benthiques littorales de la Manche - Volume 3 - Espèces zoobenthiques ArchiMer
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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Etude bioénergétique de six mollusques bivalves en baie de Saint-Brieuc ArchiMer
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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Etude écologique d'avant projet du site maremoteur du Golfe Normano-Breton 1980-1981 - Le Benthos Subtidal ArchiMer
Blanchard, Michel; Rivain, V.; Retiere, Christian.
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Ano: 1984 URL: http://archimer.ifremer.fr/doc/00047/15831/13234.pdf
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Etude l'écotoxicité des sédiments dragues - Documents de synthèse et annexes - Projet du groupe GEODE ArchiMer
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.
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Ano: 1994 URL: http://archimer.ifremer.fr/doc/00104/21573/19153.pdf
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EUPHORBE : EUtrophisation et PHénomènes d'ORigine BEnthique. Rapport d'activités 1987. ArchiMer
Gros, Philippe; Blanchard, Michel; Chardy, Pierre; Gentien, Patrick; Hamon, Dominique; Monbet, Yves.
This report assesses the main actions of the first year of the EUPHORBE project, and consists of two parts : (i) the first one is the project proposal (objectives, scientific approach) ; in the second one, the 1987' field operations are related.
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Ano: 1988 URL: http://archimer.ifremer.fr/doc/00107/21825/19413.pdf
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