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Registros recuperados: 36
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Abattement de l'azote par le marais côtier de Kervigen et potentiel breton ArchiMer
Piriou, Jean-yves; Coic, Daniel; Merceron, Michel.
The coastal marsh of Kervigen is located near by the bay of Douarnenez and its 22 hectares are almost entirely covered by reeds. An experiment was there carried out to assess the nitrogen flux depletion of a small stream, the Kerharo. That one has a 45 km 2 mostly agricultural drainage basin. Due to its nitrate loadings to the next sandy beach, it feeds a green algae (Ulva) proliferation. In order to control its nitrogen fluxes, the stream was partly diverted through a part of the marsh (9 ha), before it was allowed to go back to the main bed. Thus a collapsible weir was set up during several springs and summers, i.e. the growing period of Ulva. The nitrate stripping off the going through flux is within a 30 to 90 % range,that is important (175 kg N03...
Tipo: Text Palavras-chave: Algae; Nitrogen; Ulva; Nitrate depletion; Costal marsh; Algue; Azote; Ulva; Abattement de nitrate; Marais côtier.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/rapport-64.pdf
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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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Apports nutritifs et bactériens en estuaire de Penzé. Année 2000 ArchiMer
Piriou, Jean-yves; Droit, Julie.
L'estuaire de la Penzé (nord-Finistère, France) est le siège de plusieurs dysfonctionnements de type biologique (eutrophisation et contaminations bactériennes) qui nécessitent une bonne connaissance et un suivi des apports d'origine terrigène susceptibles d'influencer ou de provoquer ces phénomènes. Une étude sur ce secteur test a permis la mise au point d'une méthodologie de suivi des apports à l'estuaire. Celle-ci se fait en quatre étapes: 1. Inventaire des paramètres de suivi des apports. • Dans le cas de la prolifération des macroalgues du genre ulva et des microalgues toxiques Alexandrium minutum, les différents apports nutritifs azotés, phosphorés et siliceux ont été mesurés. • Dans le cas de la contamination des mollusques bivalves d'ostréiculture...
Tipo: Text Palavras-chave: Apports; Bactéries; Bassins versants; Contamination; Eutrophisation marine; Rejets; Sels nutritifs.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00105/21660/19241.pdf
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Bilan de l'action de remise en eau du marais de kervijen (Littoral de la Baie de Douarnenez) dans le cadre d'une lutte contre la marée verte. ArchiMer
Piriou, Jean-yves.
ln order to limit the excessive growth of macroalgae Ulva sp. on the beach of Kervijen (Bay of Douarnenez, Brittany, France), a field experiment was carried out, whereby part of the flow of a river was diverted into a coastal marsh. Results showed that the major part of spring and summer, Ulva proliferations have been suppressed. Part of the nitrate transported by river flow was consumed. The coastal marsh produced phytoplankton which regularly flowed on the beach
Tipo: Text Palavras-chave: Marais; Nitrates; Phytoplancton; Ulva sp.; Coastal marsh; Nitrates; Phytoplankton; -U/va sp..
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00132/24299/22297.pdf
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Biomasses d'ulves en Baie de Saint-Brieuc ArchiMer
Piriou, Jean-yves.
In recent years. large quantities of green algae (Ulva sp.) had accumulated and decayed on the southern shores of the Bay of St-Brieuc (Brittany France). Maximum standing stock has been evaluated to 25 000 tons, 11 500 tons and 5 400 tons respectively for the years 1986, 1988 and 1989. Unusual low rainfall and river flow in the springtime period seem to be responsible for this observed decreased of biomass. Nevertheless, progressively increasing average concentrations of nitrogen (limiting factor) measured in terrestrial inputs may cause an enhancement of excessive growth and accumulation of Ulva in the forthcoming years. Results of a predictive numerical model validated in 1989, show that a reduction of the phosphorus inputs by 50 % might lead to a...
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Ano: 1989 URL: http://archimer.ifremer.fr/doc/00132/24300/22298.pdf
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Cartographie de la végétation marine côtière sur le littoral Bas-Léonard (Finistère Nord) ArchiMer
Piriou, Jean-yves; Youenou, Gilles; Dreves, Luc; Chapron, Victorien.
côte très découpée et complexe, possédant une zone intertidale étendue, le littoral des Abers (Finistère-Nord) a été choisi pour la diversité de ses faciès et de ses peuplements phytobenthiques. L'objectif est d'établir un document permettant d'assurer, tant en zone intertidale que subtidale, l'interprétation de l'image SPOT acquise sur ce secteur et de pouvoir ainsi définir l'apport du satellite dans la cartographie générale du phytobenthos en milieu cÔtier, en particulier sur les fucales et les laminaires. Le maërl, espèce phytobentonique également exploitée, est pratiquement absente de cette zone test des Abers. Aussi, une étude particulière a été réalisée sur le banc très fourni de Quéménès dans l'archipel de Molène. Les objectifs ont été dans ce cas...
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Ano: 1987 URL: http://archimer.ifremer.fr/doc/00105/21603/19183.pdf
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Cartographie des zones sensibles à l'eutrophisation. Cas des côtes bretonnes ArchiMer
Piriou, Jean-yves.
Ce rapport est une compilation de textes et figures realises par chaque auteur des differents organismes suivants U.B.0., INRA, CEMAGREF, BRGM, IFREMER. La coordination a été assuree par Jean-Yves PIRIOU, IFREMER Centre de Brest. Cette etude a ete realisee grace aux financements de l'IFREMER, de la C.E.E. et de la Region Bretagne. Le BRGM collabore avec l'IFREMER pour le traitement de certaines donnees.
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Ano: 1993 URL: https://archimer.ifremer.fr/doc/00476/58739/61257.pdf
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Directive cadre sur l'eau, bassin Loire-Bretagne. Contrôles de surveillance et opérationnel dans les masses d'eau côtières et de transition ArchiMer
Oger-jeanneret, Helene; Allenou, Jean-pierre; Cheve, Julien; Collin, Karine; Dagault, Francoise; Doner, Anne; Duval, Audrey; Faure, Sandra; Fortune, Mireille; Gabellec, Raoul; Legendre, Aurelie; Le Merrer, Yoann; Piriou, Jean-yves; Retho, Michael; Ryckaert, Mireille; Thomas, Gerard; Truquet, Isabelle.
Dans les 25 masses d’eau côtières retenues au titre du contrôle de surveillance (sur 39 au total), la surveillance DCE 2010 a porté sur les paramètres suivants : -température, salinité, turbidité, oxygène dissous, nutriments (nitrate, nitrite, phosphate, ammonium, silicate); - phytoplancton (qui est suivi aussi dans 5 masses d’eau de transition non turbides) ; - macroalgues benthiques en zones intertidale (façade) et subtidale (Pays de la Loire) ; - blooms de macroalgues ; - herbiers de Zostera marina ; - invertébrés benthiques de substrat meuble en zones intertidale et subtidale. D’autre part, les 41 substances chimiques DCE ont été analysées dans les coquillages pour confirmer, ou non, les dépassements des NQE-eau observés dans certaines masses d’eau en...
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00050/16094/13569.pdf
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Directive cadre sur l’eau Bassin Loire-Bretagne. Contrôles de surveillance et opérationnel dans les masses d’eau côtières et de transition. Actions menées par Ifremer en 2011 ArchiMer
Oger-jeanneret, Helene; Allenou, Jean-pierre; Cheve, Julien; Collin, Karine; Dagault, Francoise; Derrien, Annick; Doner, Anne; Duval, Audrey; Faure, Sandra; Fortune, Mireille; Gabellec, Raoul; Genauzeau, Sylvie; Le Merrer, Yoann; Queau, Julie; Piriou, Jean-yves; Retho, Michael; Schmitt, Anne; Truquet, Isabelle.
La Directive Cadre sur l’Eau 2000/60/CE établit un nouveau cadre pour une politique communautaire dans le domaine de l’eau. Elle fixe comme objectif général l’atteinte, à l’horizon 2015, d’un bon état écologique et chimique des masses d’eau souterraines et de surface, ces dernières incluant les eaux côtières et de transition (estuaires en particulier). Les masses d’eau côtières et de transition sont des unités géographiques cohérentes, qui ont été définies sur la base de critères physiques ayant une influence avérée sur la biologie : * critères hydrodynamiques (courant, marnage, stratification, profondeur… ), * critères sédimentologiques (sable, vase, roche… ). Dans le bassin Loire-Bretagne, qui s’étend du Mont Saint-Michel à La Rochelle, le groupe de...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00108/21940/19534.pdf
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Etude de surveillance écologique sur le site de Flamanville année 1983 ArchiMer
Gentien, Patrick; Erard, Evelyne; Arnal, Olivier; Obaton, M; Quintin, Jean-yves; Belsher, Thomas; Chevalier, Claire; Dreves, Luc; Gresselin, Frederic; Guillaumont, Brigitte; Hamon, Dominique; Loarer, Ronan; Piriou, Jean-yves; Walker, Patrice.
In the framework of the building of a nuclear plant on the site of Flamanville, the C.N.E.X.O. was asked by Electricité de France, to take care of the ecological studies. These studies divide into three main phases: - Pilot studies, which are limited and aim to draw, initially, a portrait of the site. The Flamanville report was published in April 1976. - Project studies, which were spread over two years and resulted in the writing of a reference ecological assessment. These studies were carried out on the Flamanville site from July 1976 to July 1978 and the report was published in 1979. - Monitoring studies, which focus on the more significant or sensitive parameters of the site. This report presents the result of the first monitoring year (1983) and deals...
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Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/rapport-6465.pdf
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Etude écologique complémentaire. Site de Flamanville. Biomasses algales, potentielles et en dérive ArchiMer
Piriou, Jean-yves; Vigier, C.
Short lived algal species with an important biomass are the one thing most susceptible to disturb the good functioning of the pump houses of the Flamanville thermo-nuclear plant. In the biological cycle of Fugacious, Laminarials, Cystoseiraceae, Rhodymemials and, among Sargassaceae, Sargassum muticum, autumn is the season when algae are the weakest after their periods of maximal growth and reproduction. A high percentage of these algae is therefore likely to be released in the marine environment.
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Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/rapport-6403.pdf
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Etude sanitaire microbiologique. Site de la Passe aux moutons en rivière de Penzé ArchiMer
Monfort, Patrick; Piriou, Jean-yves; Annezo, Jean-pierre.
L'ostréiculture en baie de Morlaix demeure une activité emblématique du territoire qui contribue à sa notoriété ainsi qu'à son attractivité. Cette activité du secteur primaire, qui emploie 107 peronnes en Equivalent Temps Plein (ETP), produit annuellement environ 7000 tonnes d'huîtres creuses et environ 90 tonnes d'huîtres plates ce qui représentent indéniablement un poids socio-économique significatif à l'échelon local. Dans la perspective de faire évoluer les limites des zones conchylicoles existantes sur l'estuaire de la Penzé, les professionnels ont sollicité l'élaboration d'une étude de zone pour en déterminer l'opportunité. Cette demande ayant fait l'objet d'une acceptation par l'administration, le laboratoire Environnement Ressources Finistère...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00110/22132/19769.pdf
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Evaluation des proliferations d'algues vertes sur le littoral breton en juin 1994 ArchiMer
Piriou, Jean-yves; Annezo, Jean-pierre.
During June 1994, 44 beaches with "green-tides" were identified along the coasts of Brittany. Compared to previous years, seaweed amounts accumulated on beaches receiving nitrogen inputs from granitic catchments can be considered stable, contrary to beaches exposed to nutrient fluxes originating from schistous catchments, where an increase of accumulations is observed. This late process can be explained by an increase of nitrogen loadings during periods of heavy rain (late spring 1994) on impervious basement rocks.
Tipo: Text Palavras-chave: Rain; Nitrogen; Catchment; Green tide; Pluie; Azote; Bassin versant; Algue verte.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/1995/rapport-1578.pdf
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Evaluation of two library-independent microbial source tracking methods to identify sources of fecal contamination in french estuaries ArchiMer
Gourmelon, Michele; Caprais, Marie-paule; Segura, Raphael; Le Mennec, Cecile; Lozach, Solen; Piriou, Jean-yves; Rince, A.
In order to identify the origin of the fecal contamination observed in French estuaries, two library-independent microbial source tracking (MST) methods were selected: (i) Bacteroidales host-specific 16S rRNA gene markers and (ii) F-specific RNA bacteriophage genotyping. The specificity of the Bacteroidales markers was evaluated on human and animal (bovine, pig, sheep, and bird) feces. Two human-specific markers (HF183 and HF134), one ruminant-specific marker (CF193'), and one pig-specific marker (PF163) showed a high level of specificity (>90%). However, the data suggest that the proposed ruminant-specific CF128 marker would be better described as an animal marker, as it was observed in all bovine and sheep feces and 96% of pig feces. F RNA...
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Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3535.pdf
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Golfe Normano-Breton - Carte biomorphosédimentaire de la zone intertidale au 1/25 000 ArchiMer
Guillaumont, Brigitte; Hamon, Dominique; Piriou, Jean-yves; Lafond, L.r.; Le Rhun, J.; Levasseur, J..
Ce document, réalisé sous l'égide de l'IFREMER avec la collaboration du Laboratoire de Géomorphologie de l'Ecole Pratique des Hautes Etudes de Dinard et le Laboratoire Botanique de l'Université de Rennes 1, constitue la synthèse des travaux réalisés par le groupe "Estrans et Zones humides" dans le cadre de l'Etude Régionale Intégrée du Golfe Normano-Breton. Il se présente sous la forme d'une cartographie biomorphosédimentaire (7 cartes au 1/25 000) de la zone intertidale de la Côte Ouest du Cotentin et de la Baie du Mont Saint-Michel, complétée par une notice explicitant la légende des cartes et présentant les principaux ensembles biosédimentaires observés sur le littoral du golfe.
Tipo: Text Palavras-chave: Cartographie; Estran; Zones humides; Géologie; Morphologie; Sédimentologie; Zoobenthos; Phytobenthos; Végétation phanérogamique; Golfe Normano-Breton; Ouest Cotentin; Baie du Mont Saint-Michel.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/00047/15851/13270.pdf
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Inventaire des sites potentiels pour l'aquaculture sur le littoral des Cotes-du Nord : fascicule 1: aquaculture nouvelle ArchiMer
Couteaux, B; Jegou, Anne-marie; Merceron, Michel; Piriou, Jean-yves.
This report is the first stage of the Inventory of Potential Sites for Aquafarming along the Côtes-du-Nord shoreline. This type of inventory was conducted previously in Seine-Maritime, in Basse-Normandie, in Finistère, and along the central part of the Atlantic coast. This kind of study is generally motivated by two findings: -the growing use of the shoreline area for various activities -the need to set aside suitable sites for the development of aquafarming. In order to make consistent development choices, it is important to know as well as possible the aquafarming potential sites that we have available, their size, their nature, their geographic distribution, as well as the state of the techniques to be implemented. In Brittany itself, a quick...
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Ano: 1979 URL: http://archimer.ifremer.fr/doc/1979/rapport-2660.pdf
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Inventaire des sites potentiels pour l'aquaculture sur le littoral du Finistère. 2ème phase : Aquaculture nouvelle, fichier ArchiMer
Merceron, Michel; Jegou, Anne-marie; Couteaux, B; Piriou, Jean-yves.
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Ano: 1979 URL: http://archimer.ifremer.fr/doc/1979/rapport-2663.pdf
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Inventaire des sites potentiels pour l'aquaculture sur. le littoral du Finistère : fascicule 1 : aquaculture nouvelle ArchiMer
Merceron, Michel; Jegou, Anne-marie; Couteaux, B; Piriou, Jean-yves.
This report is the first stage of the Inventory of Potential Sites for Aquafarming along the Finistère shoreline. This type of inventory was conducted previously in Seine-Maritime, in Basse-Normandie, and along the central part of the Atlantic coast. This kind of study is generally motivated by two findings: -the growing use of the shoreline area for various activities, -the need to set aside suitable sites along the shoreline for the development of aquafarming. In order to make consistent growth choices, it is important to know as well as possible the aquafarming potential that we have available, their size, their nature, their geographic distribution, as well as the degree of maturity of the techniques to be implemented. In Brittany itself, a quick...
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Ano: 1978 URL: http://archimer.ifremer.fr/doc/1978/rapport-2661.pdf
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Inventaire des sites potentiels pour l'aquaculture sur le littoral du Finistère : première phase (Etude bibliographique et reconnaissance terrain) Fascicule 1 : Aquaculture nouvelle ArchiMer
Merceron, Michel; Jegou, Anne-marie; Couteaux, Bertrand; Piriou, Jean-yves.
Producing the Inventory of Potential Sites for Aquaculture along the Finistère Shoreline was decided by the Département's Regional Council with the goal of integrating aquafarming in the best way possible into the variety of businesses that are based along the coastal zone. Aquafarming, in order for it to exist tomorrow, needs to be taken into account today as far as preservation of sites, and this must be done with two aspects in mind: - land, on shore; - water quality (which implies maritime and land constraints). In this context, the Regional Council has entrusted the Centre National pour l'Exploitation des Océans with a study that will make it possible to define the aquafarming potential of the Finistère shoreline. It was decided to split this study...
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Ano: 1978 URL: http://archimer.ifremer.fr/doc/1978/rapport-2655.pdf
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La dénitratation dans un marais littoral pour lutter contre la prolifération des algues vertes (Kervigen, baie de Douarnenez) ArchiMer
Merceron, Michel; Piriou, Jean-yves; Coic, Daniel.
The coastal marsh of Kervigen is located near by the bay of Douarnenez and its 22 hectares are almost entirely covered bV reeds. An experiment was there carried out to assess the nitrogen flux depletion of a sma/l stream, the Kerharo. The last one has a 45 I<m2, mostlv agricultural, drainage basin. Due to its nitrate loadings to the nexl sandy beach, it feeds a green algae (U iva) proliferation. In order to control its nitrogen fluxes, the stream was partly divelted through a part of the marsh (9 ha), before it was allowed ta go back to the main bed. Thus a collapsible weir was set up during severalsprings and summers, i.e. the growing period ofulva. The nitrate stripping off the going through flux is withina60 to 90 % range, thal is important (about...
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Ano: 1997 URL: http://archimer.ifremer.fr/doc/1997/acte-3335.pdf
Registros recuperados: 36
Primeira ... 12 ... Última
 

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