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Registros recuperados: 62
Primeira ... 1234 ... Última
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A comprehensive hydro-geomorphic study of cliff-top storm deposits on Banneg Island during winter 2013–2014 ArchiMer
Autret, Ronan; Dodet, Guillaume; Fichaut, Bernard; Suanez, Serge; David, Laurence; Leckler, Fabien; Ardhuin, Fabrice; Ammann, Jerome; Grandjean, Philippe; Allemand, Pascal; Filipot, Jean-francois.
Large clastic cliff-top storm deposits (called CTSDs) are one of the most remarkable signatures that characterizes extreme storm wave events on coastal cliffs. Hence, the study of CTSDs is of key importance for understanding and predicting the impacts of extreme storm wave events on rocky coasts or establishing proxies for storm intensity. The present study uses new data including hydrodynamic measurements in both deep and intertidal waters, and records of CTSDs displacement and deposition across Banneg Island during the stormy winter 2013–2014. Two drone-based surveys were carried out in January 2013 (pre-storms) and in April 2014 (post-storms). In addition, complementary field observations were carried out during the winter, providing a comprehensive and...
Tipo: Text Palavras-chave: Cliff-top storm deposit; Block transport; Extra-tropical cyclone; Run-up; Coastal erosion; Brittany.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00353/46411/46139.pdf
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Approche de la dynamique de stocks accessoires ArchiMer
Moguedet, Philippe.
For a few years now, the landings from the Lorient's industrial fleet have been continually increasing (32,000 tons in 1980, 56,000 tons in 1985). This fleet practices a multispecific exploitation of the international fishery of the west and north of Scotland. The rock salmon (Pollachius virens) is the fleets' target species, its catches of other gadidae are considered secondary. Two of the catches, those of the blue ling (Molva dypterygia) and the ling (Molva molva) have been advancing since the beginning of the decade and in 1985 represented 21% of the total amount in quantity and value landed by the industrial fleet. The objective of this study is to asses the status of these ling resources and examine whether their exploitation can, in the short term,...
Tipo: Text Palavras-chave: Stock dynamics; By catch; Ling; Molva spp; Industrial fleet; Lorient; Brittany; Gadidés; Biologie; Dynamique des stocks; Flottilles industrielles; Lorient; Bretagne; Molva spp; Lingue; Stock accessoire.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/1988/these-2310.pdf
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Bilan des connaissance et des enjeux relatifs aux ressources marines de l'estuaire de l'Odet ArchiMer
Billy, Stéphany; Peronnet, Isabelle.
The estuary of the Odet, which can be defined as a ria, is an integral part of SAGE, taken on by SIVALODET. This space was hardly studied and it seemed important to perform a full assessment of knowledge and issues relating to this ria's fragile and unstable ecosystem. This assessment must be performed according to several points of focus; it must first of all strive to retrace the history of the fisheries in the Odet, then make it possible to identify as clearly as possible the marine habitats that make up this site. With that, it must then bring to light the potential resources of the estuary and finally resituate the Odet in relation to the other Breton estuaries.
Tipo: Text Palavras-chave: Water quality; Shellfish farming; Parasite; Oysters; Bonamia ostrea; Marteilia refringens; Odet estuary; Brittany; Parasite; Huître; Qualité de l'eau; Habitats de l'Odet; Nourriceries de l'Odet; Marteilia refringens; Bonamia ostrea; Réglementation de la pêche; Estuaire de l'Odet; Bretagne.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/rapport-2334.pdf
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Bilan des tempêtes de l’hiver 2013-2014 sur la dynamique de recul du trait de côte en Bretagne ArchiMer
Blaise, Emmanuel; Suanez, Serge; Stephan, Pierre; Fichaut, Bernard; David, Laurence; Cuq, Veronique; Autret, Ronan; Houron, Julien; Rouan, Mathias; Floc'H, France; Ardhuin, Fabrice; Cancouet, Romain; Davidson, Robert; Costa, Stephane; Delacourt, Christophe.
Between December 2013 and March 2014, a cluster of about 12 storm events hit the coast of Brittany with an exceptional frequency. It was in February that these storm events were the most frequent and particularly virulent. The significant wave heights measured off Finistere reached respectively 12.3 m and 12.4 m during Petra and Ulla storms on February 5 and 14. However, analysis of hydrodynamic conditions shows that only three episodes promoted extreme morphogenetic conditions because they were combined with high spring tide level. The first one occurred on January 1 to 4, it was followed by events from February 1 to 3, and March 2-3. During these three extreme events observed tide levels were above highest astronomical tide level (HAT). Maximum surge...
Tipo: Text Palavras-chave: Tempête; Érosion; Trait de côte; Marée de vive-eau; Bretagne; Surcote; Storm; High spring tide; Surge; Erosion; Shoreline; Brittany.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00310/42171/43029.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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Bivalves: Indicateurs de pollution microbienne des eaux littorales ArchiMer
Plusquellec, A; Beucher, M; Legal, Y.
Sea water and mussels from a natural site (Concarneau - France) have been compared for fecal contamination by enumeration of their fecal Coliform and fecal Streptococci content. Mussels contain a significant concentration of bacteria, although this concentration differs for the two indicators. Enumeration of fecal Streptococci in bivalves leads to a reduction of the variability observed in sea water. Mussels allow a more efficient assessment of Salmonella in the marine environment than sea water itself.
Tipo: Text Palavras-chave: ANE; France; Brittany; Concarneau Bay Salmonella Mytilidae Bivalvia Streptococcus Tidal currents Bioaccumulation Marine pollution Sea water Bacteria Pollution indicators Pollution detection Microbial contamination Indicator species.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-1005.pdf
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Caractéristiques de dragues et pêcheries ArchiMer
Pitel, Mathilde; Berthou, Patrick; Fifas, Spyros.
Basically, a dredge is a bottom-towed gear and consists of a metal frame with a blade or teeth, to dig into the sediment and extract the shelled molluscs, and a mesh bag to collect the catch. Whereas hand dredging is observed on some intertidal beds (Donax trunculus in France), the use of dredge generally needs a fishing boat. There is a great diversity of dredge types, with specific designs used to target different species in particular beds: Manual dredges for Donax (Donax trunculus), Warty venus (Venus verrucosa) and clams (Venerupis pulastra, Ruditapes sp) Dredges for King scallops (Pecten maximus) Dredges for Warty venus (Venus verrucosa) Dredge for Queen scallops (black and white, Chlamys varia and Chlamys opercularia) Dredges for small...
Tipo: Text Palavras-chave: Management; Environmental impact; Spisula; Bittersweet palourdi; Fishing boat; Clam; Dredge; Brittany; Gestion; Impact environnemental; Spisula; Amande; Navire de pêche; Drague; Bretagne.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/rapport-4608.pdf
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Comment épargner les juvéniles de soles et de gadidés dans la pêcherie crevettière : expériences de chalut sélectif en baie de Vilaine, première partie ArchiMer
Dupouy, Herve; Vacherot, Jean-philippe; Meillat, Marc.
The French brown shrimp (Crangon crangon) fishery employs on a seasonal basis around 140 ships about 10 metres in length and with engines of about 100 kilowatts of power. It takes place mainly along the coastal bottoms of silted-up sand at a depth of 2 to 10 metres and occupies principally the coasts of the eastern English Channel and those of the Gulf of Gascony. The brown shrimp catch is performed by bottom trawl, with exempted meshing of 20 mm (stretched mesh), which causes numerous rejects of immature fish that live on the same bottoms. The main part of these juveniles is made up of flat fish (sole, in particular) and of gadidae (whiting and pout). To reduce these undesirable catches that are also detrimental to other fisheries, some ingenious...
Tipo: Text Palavras-chave: Selective trawl; Devisme trawl; Asselin trawl; Brittany; Bay of Vilaine; Gadides; Sole; Whiting; Pout; Juvenile; Chalut devisme; Chalut Asselin; Chalut sélectif; Baie de Vilaine; Gadidés; Soles; Merlan; Tacaud; Juvéniles.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/1997/rapport-2669.pdf
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Contribution a la connaissance du regime alimentaire de la seiche (Sepia officinalis L.) (Mollusque Cephalopode) dans le nord du golfe de Gascogne et dans le golfe du Morbihan: Resultats preliminaires ArchiMer
Pinczondusel, G; Daguzan, J.
The specific analysis of preys allows to determine the composition of cuttlefishes alimentary diet in natural conditions. This analysis based on exploitation of stomachal contents shows a majority of Fishes and Brachyura Crustaceans consumed. The alimentary diet with a Fish dominance in winter area (off Belle-Ille island) becomes a Crustacea dominance when adult cuttlefishes come in Morbihan Bay, in March, for reproduction. As for newly-born, they eat exclusively Crustacean Amphipoda and Macrura.
Tipo: Text Palavras-chave: ANE; France; Brittany; Morbihan Gulf Sepia officinalis Cephalopoda Spring Adults Winter Prey selection Sexual reproduction Stomach content Diets.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-928.pdf
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Dinoflagelles toxiques sur les cotes francaises pendant l'ete 1983. Extension du dinoflagelle Dinophysis acuminata en Bretagne sud et consequences pour les cultures marines. ArchiMer
Lassus, Patrick; Martin, A; Maggi, Pierre; Berthome, Jean-paul; Langlade, Aime; Bachere, Evelyne.
Discolored waters and human diseases by shellfishes were dominant features of summer 1983 in south coast of Brittany. Vilaine Bay, the most damaged area, was successively affected by brown waters in early June, and diarrhetic intoxications by harvested mussels (July and August), just as DPS producing dinoflagellate (D. acuminata ) reached higher water or mussel guts concentrations than years before. Outspreading in the whole south coast of Brittany and possible relation with hydrological or biological parameters are analyzed.
Tipo: Text Palavras-chave: Brittany; France; ANE; Protista; Dinophysis acuminata; Shellfish culture; Red tides; Biological poisons; Toxicants.
Ano: 1983 URL: http://archimer.ifremer.fr/doc/1983/publication-1805.pdf
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Dinoflagelles toxiques sur les cotes francaises pendant l'ete 1983. Perturbations des ecosystemes en baie de Vilaine. Analyse des successions phytoplanctoniques precedant l'apparition d'un dinoflagelle toxique. ArchiMer
Pierre, Marie-josé; Lassus, Patrick.
The incidence of phytoplankton communities sequences on toxic dinoflagellate Dinophysis acuminata occurrence was studied in the course of summer 1983, in Vilaine Bay. Despite difficulties in finding obvious relationship between occurrences of that species in the fields and preceding species it nevertheless may be emphasized: 1) a real perturbation of ecosystems is noticeable (rank-frequency diagrams); 2) the amount of sampling stations might be reduced in so far as representative stations are maintained.
Tipo: Text Palavras-chave: Vilaine Bay; Brittany; France; ANE; Dinophysis acuminata; Ecosystem disturbance; Red tides; Phytoplankton; Ecological succession.
Ano: 1983 URL: http://archimer.ifremer.fr/doc/1983/publication-1806.pdf
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Dinoflagelles toxiques sur les cotes francaises pendant l'ete 1983.Validite du test-souris pour le controle routinier de secteurs mytilicoles contamines par la toxine du Dinophysis. ArchiMer
Marcaillou-le Baut, Claire; Le Dean, Loic; Truquet, Philippe.
Following exceptional outbreak of toxic dinoflagellate species in Vilaine Bay (summer 1983) a survey was carried out: variations in phytoplankton abundance and distribution in water and in mussel guts were followed. In the same time toxicity studies using mouse-test were performed with contaminated shellfishes, and mouse-test calibration was attempted. In spite of sampling and analysis conditions could be open to criticism, results obviously showed relation between shellfishes toxicity and occurrence of responsible species: Dinophysis acuminata.
Tipo: Text Palavras-chave: Brittany; France; ANE; Dinophysis acuminata; Red tides; Toxicity tests; Food poisoning; Biological poisons; Mussel culture.
Ano: 1983 URL: http://archimer.ifremer.fr/doc/1983/publication-1808.pdf
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Environmental factors affecting maerl bed structure in Brittany (France) ArchiMer
Dutertre, Mickael; Grall, Jacques; Ehrhold, Axel; Hamon, Dominique.
This study used a large spatial scale approach in order to better quantify the relationships between maerl bed structure and a selection of potentially forcing physical factors. Data on maerl bed structure and morpho-sedimentary characteristics were obtained from recent oceanographic surveys using underwater video recording and grab sampling. Considering the difficulties in carrying out real-time monitoring of highly variable hydrodynamic and physicochemical factors, these were generated by three-dimensional numerical models with high spatial and temporal resolution. The BIOENV procedure indicated that variation in the percentage cover of thalli can best be explained (correlation = 0.76) by a combination of annual mean salinity, annual mean nitrate...
Tipo: Text Palavras-chave: Benthic habitats; Brittany; Environmental factors; Estuary; Large spatial scale; Maerl.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00280/39089/37816.pdf
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Esquisse d'un bilan écologique provisoire de l'impact de la marée noire de l"Amoco-Cadiz" sur le littoral ArchiMer
Chasse, C..
The wreckage of the tanker "AMOCO CADIZ" on the reefs of PORTSALL was the fourth oil spill in ten years on the coast of Brittany : it also is the largest known oil spill in the world. The patches at sea were driven eastward by westerly winds from March 17 to March 23. 140 Km of coast line was polluted. The oil spreaded more slowly towards the north west, south and north west where it spoiled some 375 Km of touristic sea coast and important fishing grounds. The coastline is six kilometers wide ; it includes islands and large reefs. The local tidal currents are very strong and reach more than three knots, during spring tides which may rise up to nine meters in a rough sea conditions. The turbulence of the water soon disper­sed the slicks and mixed the oil...
Tipo: Text Palavras-chave: Marée noire; AMOCO CADIZ; Bretagne; Bilan écologique; Littoral; Oil spill; AMOCO CADIZ; Brittany; Ecological assessment; Shoreline.
Ano: 1978 URL: http://archimer.ifremer.fr/doc/00306/41722/40933.pdf
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Estimation du stock naturel d'ormeaux du golfe du Morbihan ArchiMer
Billy, Stéphanie; Peronnet, Isabelle; Salaun, Michele.
The Gulf has very tiled sea beds, and the surface areas of habitats suitable for ormer populations are rather reduced (1.56km2). Three zones have ormer densities of interest from the point of view of profitability, Brannec, lrus and Creizig. But since their surface area is not great, the exploitable biomass, that corresponding to individuals of a size greater than 80mm (legal catch size), is average. These three zones would be exploitable but following a limited fishing effort. The sectors of Ile aux moines and Jument and Henn Tenn show average to low densities and are not therefore exploitable in a profitable way. Finally, Gavrinis and le Logeo have revealed low densities of ormers, this could be due to an intensive illegal exploitation. In fact, many...
Tipo: Text Palavras-chave: Stock assessement; Exploitable population; Bay of Morbihan; Haliotis tubertulata; Brittany; Biomasse; CLPM Auray/Vannes; Population exploitable; Bretagne; Golfe du Morbihan; Haliotis tubertulata; Ormeaux.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/rapport-2326.pdf
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Etude préalable à la gestion des stocks de crustacés en Bretagne ArchiMer
Autissier, Isabelle; Coum, Andrée; Cuillandre, Jean Pierre; Veron, Gerard; Latrouite, Daniel.
At the end of the seventies, as fishing abundance (based on Catch Per Unit Effort) in crabs and lobster fishery steadily declined, operating expenses increased, and fishing boats changed strategy (changing metiers, covering larger distance to fishing areas, fishing seasons being extended, ...) professionals and scientists aimed to consider reinforcing management measures. To enlighten and support potential related decisions, the Comité Régional des Pêches et Cultures Marines de Bretagne (Regional Committee for fishing and farming in Brittany), together with the ISTPM (Ifremer since 1984), conducted a survey on the exploited populations and gave a review of the involved Breton fleet. This report shows the results of a survey conducted among fishermen,...
Tipo: Text Palavras-chave: Landings; Catch rates; Fishing area; Fishing effort; Fleet; Brittany; Edible crab; Lobster; Spider crab; Apport; Rendement; Zone de pêche; Effort de pêche; Flottille; Bretagne; Tourteau; Homard; Araignée.
Ano: 1981 URL: http://archimer.ifremer.fr/doc/1981/rapport-1548.pdf
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Etudes des activites de peche dans le golfe du Morbihan, peche professionnelle ArchiMer
Peronnet, Isabelle; Talidec, Catherine; Daures, Fabienne.
The objective of the study is to improve knowledge of coastal fishing activity in the halieutic and economic spheres. It consists of three sections: On-board professional fishing, professional shellfish gathering, and leisure fishing, this last one being the subject of an independent report (Lesueur and Drouot). The methodology applied is based on implementation of specific surveys about the ships that frequented the Gulf of Morbihan in 2001. The emphasis was placed on identifying the occupations practiced in this zone, on describing these activities and their intensity as well as on analysing the economic performance of these fleets. The management methods, regulation of shellfish gathering on listed sites as well as their impacts on the environment are...
Tipo: Text Palavras-chave: Urshin; Clams; Shellfish; Fleets; Metiers; Fishing activities; Bay of Morbihan; Brittany; Structure de cout; Oursin; Palourde; Bivalves; Typologie; Flottilles; Metiers; Indicateurs; Activités de peche; Golfe du Morbihan.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/rapport-2265.pdf
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Evaluation directe du stock de praires Venus verrucosa en rade de Brest ArchiMer
Pitel, Mathilde; Fifas, Spyros; Berthou, Patrick.
In the 1960s, with a drop in the king scallop stock, the clam became a substitution resource with productions of over 400 tonnes. The drop in the production until the disruption of the fishery in the 1980s is the combined consequence of the increase of the fishing capacities with an unfavourable populating demographic strategy. Large deposits are fairly rare. In 7 years, only one age group, born in 1971, withstood the fishery. Many age groups of satisfactory abundance, from the end of the 80s on, combined with a total disruption of the fishery for a few years, lead to a recovery of the stock with fishing levels equivalent (today) to those of the 1950s. The clam, though less iconic than the king scallop in the local context, has now been for a number of...
Tipo: Text Palavras-chave: Campaign; Jeancani; Survey; Venus verrucosa; Clams; Bay of Brest; Brittany; Jeancani; Campagne à la mer; Venus verrucosa; Praires; Rade de Brest; Bretagne.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/rapport-4603.pdf
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Evaluation du stock de praires en rade de Brest ArchiMer
Pitel, Mathilde; Martin, Stephane; Fifas, Spyros; Huet, Jerome; Berthou, Patrick.
Pendant les années 50, la praire a joué un rôle secondaire dans le contexte maritime local. Au cours des années 50, cette espèce était ciblée par une flottille différente de la coquille Saint-Jacques de la rade de Brest, à capacité de capture modeste (flottille du Relecq Kerhuon) permettant la réalisation des captures annuelles moyennes de l'ordre de 150 tonnes. La décennie 60, après l'effondrement du stock coquillier a vu la praire occuper une place de ressource de substitution pour atteindre des productions dépassant les 400 tonnes. Les premières étapes de l'évolution de cette pêcherie sont détaillées par Le Gall (1969) et Piboubès (1973). Petit à petit, la flottille s'est transformée (à partir des années 70, entrée progressive des goémoniers dans la...
Tipo: Text Palavras-chave: Jeancani; Venus verrucosa; Clams; Bay of Brest; Brittany; Jeancani; Venus verrucosa; Ressource de substitution; Praires; Rade de Brest; Bretagne.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/rapport-4602.pdf
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Evaluation du stock de praires en rade de Brest - 2001 ArchiMer
Pitel, Mathilde; Fifas, Spyros; Huet, Jerome; Berthou, Patrick.
During the 1950s, the clam played only a bit part in the local maritime context. It was the focus of a different fleet than the king scallop fleet, with a lesser fishing capacity (fleet from the Relecq Kerhuon) and an average annual catch of around 150 tonnes. In the 1960s, with a drop in the king scallop stock, the clam became a substitution resource with productions of over 400 tonnes. The first stages of this evolution are detailed by Le Gall (1969) and Piboubès (1973). Slowly, the fleet developed (from the 70s on, with the progressive arrival of seaweed boats in the fishery) The drop of the production until the disruption of the fishery in the 1980s is the combined consequence of the increase of the fishing capacities with an unfavourable populating...
Tipo: Text Palavras-chave: Venus verrucosa; Stock assessment; Clams; Bay of Brest; Brittany; Venus verrucosa; Évaluation de stock; Praires; Rade de Brest; Bretagne.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/rapport-4607.pdf
Registros recuperados: 62
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