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Registros recuperados: 30
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Analyse des tendances des séries temporelles de la concentration en azote minéral dissous dans les trois principaux estuaires de la façade Manche-Atlantique ArchiMer
Gailhard, Isabelle.
Estuaries are areas which, from their structure, their fonctioning, and their localisation, are subject to significant contribution of nutrients. One of the objectif of the RNO, the French network for coastal water quality monitoring, is to assess the levels and trends of nutrient concentrations in estuaries. A linear model was used in order to describe and to explain the total dissolved nitrogen concentration evolution in the three most important estuaries on the Chanel-Atlantic front (Seine, Loire and Gironde). As a first step, the selection of a reliable data set was performed. Then total dissolved nitrogen evolution schemes in estuary environment were graphically studied, and allowed a resonable choice of covariables. The salinity played a major role...
Tipo: Text Palavras-chave: Nutriments; Estuaire; Loire; Seine; Gironde; Schéma de dilution; Modèle linéaire; Tendance; Nutrients; Estuary; Seine; Loire; Gironde; Dilution schema; Linear mode1; Trend.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00079/19070/16665.pdf
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Analyse statistique des données du RSL - Etude des trajectoires écologiques des lagunes entre 2001 et 2012 ArchiMer
Derolez, Valerie; Ouisse, Vincent; Fiandrino, Annie; Munaron, Dominique; Bissery, Claire; Kloareg, Maela.
Les questions abordées dans le présent rapport concernent la recherche et l’interprétation d’un repère de représentation des données du RSL (colonne d’eau et phytoplancton) pour l’ensemble des stations des lagunes de Provence-Alpes Côte d’Azur (PACA), Languedoc-Roussillon (LR) et Corse : 1) Est-il possible de trouver un repère pertinent de représentation des trajectoires d’évolution pour toutes les stations, en effectuant des regroupement par typologie de stations ? Comment interpréter les deux premiers axes de l’analyse en composantes principales (ACP) ? 2) Le premier axe des repères d’ACP constitue-t-il un « Gradient d’eutrophisation » ? 3) Est-il possible de mettre en évidence un effet météorologique sur les évolutions des teneurs en azote et phosphore...
Tipo: Text Palavras-chave: Lagunes; Eutrophisation; Restauration; Trajectoires; Nutriments; Phytoplancton..
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00173/28423/26754.pdf
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Détection satellitaire et modélisation opérationnelle de la production végétale non-fixée dans la bande côtière bretonne ArchiMer
Penard, Cédric.
The negative impact of the man on the environment unquestionably increases. The coastal environment as a whole is the maritime environment which is the most exposed to man-made eutrophication. For instance, nitrate loads to coastal waters off Brittany (France) have increased 10 times (from 3 to s 30mg L-1NO3) during the four last decades. Eutrophication of this coastal zone is now a recurrent problem, more and more worrying. This eutrophication exhibits two main forms : " green tides ", which are caused by local proliferations and stranding of green macro-algae (particularly the Ulva species) in nitrogen-enriched areas ; phytoplanktonic blooms, which are responsible for coloured water events, toxic species can be present (Pseudo-Nitzschia, Alexandrium,...
Tipo: Text Palavras-chave: Bande côtière bretonne; Modèle couplé hydrodynamique-biogéochimie; Nutriments; Chlorophyllea; Production primaire; Eutrophisation; Modèle opérationnel; Pseudo-Nitzschia; French Brittany coastal shelf; Hydrodynamical biogeochemical coupled model; Nutrients; Chlorophyll-a; Primary production; Eutrophication; Operational model; Pseudo-Nitzschia.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00015/12603/9481.pdf
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Dynamique du carbone et des nutriments dans la zone côtière Baie de l’Aiguillon-Pertuis Breton et influence des apports terrestres du bassin versant du Marais poitevin ArchiMer
Lannuzel, Reva.
Coastal zones represent key systems in biogeochemical cycle couplings between continents, oceans and the atmosphere transporting considerable amounts of matter, energy and nutrients (C, N, P et Si) from land to sea. Despite its relatively modest surface area (7 % of the global ocean surface), this zone accounts for 14–30 % of all oceanic primary production. The present study deals with nutrients and carbon dynamics during a full hydrologic cycle in 2017 over the terrestrial-aquatic continuum formed by the Poitevin Marsh-Aiguillon Bay- Breton Sound to better understand terrestrial export influence on the coastal zone. Carbon and nutrient concentrations were sampled twice a month over heterogeneous sites (estuaries, channels and coastal sites) to integrate...
Tipo: Text Palavras-chave: Zone côtière; Biogéochimie; Carbone; Nutriments; Chlorophylle a; Limitation potentielle et réelle; Dynamique.; Coastal zone; Biogeochemistry; Carbon; Nutrients; Chlorophyll a; Real and potential limitation; Spatio-temporal dynamic..
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00445/55647/57299.pdf
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Dynamique hivernale des nutriments et du carbone dans les exutoires du Marais poitevin et flux terrestres associés en Baie de l’Aiguillon ArchiMer
Le Marchand, Marie.
  Coastal environments represent key systems in biogeochemical cycle couplings between continents, oceans and the atmosphere. Despite its relatively modest surface area (7 % of global ocean), this zone accounts for 14-30 % of all oceanic primary production. The amount of nutrients (N, P, C, Si) carried by terrestrial aquatic systems directly influences the primary production, the food web structure and the overall quality of these coastal environments. The present study deals with autumn-winter carbon and nutrients dynamics over terrestrial waters of the Marais poitevin watershed flowing to the Aiguillon bay (west of France). Five heterogeneous watercourses were sampled twice a month since January 2017 to measure nutrients and carbon concentrations and...
Tipo: Text Palavras-chave: Zones côtières; Cycles biogéochimiques; Carbone; Nutriments; PCO2; Marais poitevin; Coastal areas; Biogeochemical cycles; Carbon; Nutrients; PCO2; Marais poitevin.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00393/50487/51223.pdf
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Etude des apports en herbicides et en nutriments par la Charente : Modélisation de la dispersion de l'atrazine dans le bassin de Marennes-Oléron ArchiMer
Munaron, Dominique.
Our study aims at making progress the estimate of herbicide and nutrient inputs to the Marennes-Oleron bay which could influence summer oysters mortalities, and to bring by modeling a better understanding of the dynamics of these compounds in the shellfish-farming area. The development of a strategy adapted to the Charente river and its estuary reveals that agricultural activity on the catchment area is omnipresent, as well on the level of the nitrogen and herbicides contributions. It is thus necessary to specify Charente fluxes, which is the main tributary of the Marennes-Oleron bay, in order to better characterize its impact on shellfishfarming activity. Use of a dispersion model will constitute an invaluable help in the risk assessment with respect to...
Tipo: Text Palavras-chave: Atlantic coast; Marennes Oléron Bay; Modelisation; Estuary; Geochemistry behaviour; Charente River; Flux; Nutrient; Herbicide; Littoral Atlantique; Bassin de Marennes Oléron; Modélisation; Estuaire; Comportement Géochimique; Charente; Flux; Nutriments; Herbicides.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/these-2266.pdf
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Étude et modélisation des populations de macrophytes dans la lagune de Thau (Hérault, France) ArchiMer
Plus, Martin.
The works carried out can be divided in three main lines : design and management of experimental studies on primary production processes, macrophyte spatial distribution study and development of macrophyte and seagrass numerical models. In situ and in vitro experiments have been performed with the aim of studying the processes and the parameters involved in the photosynthesis-respiration system, as well as to establish the main biotic (self-shading effect, physiology of the photosynthesis, carbon, nitrogen and chlorophyll tissu contents) and abiotic (temperature, light and nutrients) factors controlling macrobenthic primary production. A seagrass ecosystem model based on nitrogen and oxygen fluxes has been developped. Model calibration and validation have...
Tipo: Text Palavras-chave: Primary production; Light; Nitrogen; Nutrients; Mathematical model; Thau lagoon; Seagrass; Macrophytes; Production primaire; Lumière; Azote; Nutriments; Model mathématique; Thau; Phanérogames; Macrophytes.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/these-6518.pdf
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Évaluation du descripteur 5 « Eutrophisation » en France métropolitaine. Rapport scientifique pour l’évaluation 2018 au titre de la DCSMM ArchiMer
Devreker, David; Lefebvre, Alain.
This report is the second assessment of French marine water eutrophication status (descriptor 5) done in the framework of the MSFD. The goal of this report is to determine if French marine water reach the Good Ecological State as defined by the MSFD. It stands next to the initial evaluation made in 2012, from which it is an update. It introduces the second cycle of the Marine Environment Action Program. It shows that French marine waters, behind the 12 nm line, reach the GES as defined by the MSFD. Problems link to eutrophication occurs in marine waters above the 12 nm, where 6.5% of the area do not reach the GES.
Tipo: Text Palavras-chave: DCSMM; Eutrophisation; Évaluation; Bon Etat Ecologique; Seuils; Indicateurs; Nutriments; Chlorophylle-a; Oxygène; Turbidité; Macroalgues; Pressions écologiques; MSFD; Eutrophication; Assessment; Good Environmental Status; Thresholds; Indicators; Nutrients; Chlorophyll-a; Oxygen; Turbidity; Macroalgae; Ecological pressures..
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00437/54868/56361.pdf
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Evolution de l'environnement hydroclimatique du bassin de Marennes-Oléron dans le contexte du changement global ArchiMer
Soletchnik, Patrick; Le Moine, Olivier; Polsenaere, Pierre.
Dans le contexte du changement global dont la cause anthropique est maintenant reconnue, cette étude dresse un bilan de l’évolution hydro-climatique des Pertuis Charentais (Bassin de Marennes-Oléron) depuis les quarante dernières années. Elle présente une comparaison de la situation hydro-climatique avant et après la « rupture thermique » des années 80-90, reconnue à l’échelle de l’hémisphère Nord et mise également en évidence dans les Pertuis entre 1983-1997. Les deux périodes comparées sont (1977-1991) d’une part et (2000-2015) d’autre part. Entre les deux, l’élévation des températures de l’eau de mer de 1,5°C en moyenne et 3°C en médiane, s’est accompagnée d’une élévation de la salinité (0,6 à 0,9) en lien avec un déficit d’apport des fleuves internes...
Tipo: Text Palavras-chave: Hydrologie; Hydro-climat; Hydrodynamique; Bassin de Marennes-Oléron; Evolution; Réchauffement climatique; Apports; Fleuves; Température; Salinité; Nutriments; Chlorophylle a.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00387/49815/50391.pdf
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Flux d’eau et de nutriments extrapolation mensuelle et saisonnière. Etude réalisée sur la lagune de Biguglia et l’estuaire de Fiume Santu (Haute-Corse) ArchiMer
Colmet-daage, Raphael; Malet, Nathalie.
Les écosystèmes côtiers marins sont parmi les plus productifs au monde et jouent un rôle essentiel dans le cycle de la matière. Ces écosystèmes ont en effet une très forte capacité d'exportation de matière, de ressources trophiques et d'organismes. Ces milieux sont en particulier fortement influencés par les variations des conditions hydro-climatiques environnantes. C’est avec l’objectif de mieux comprendre le fonctionnement écologique de ces milieux de transition que la présente étude a été réalisée. L’objectif de cette étude est d’une part de mettre en place une méthodologie de mesure et de calcul des flux d’eau et de nutriments au sein de ces milieux de transition en Haute-Corse, et d’autre part d’extrapoler les résultats horaires à des simulations...
Tipo: Text Palavras-chave: Flux d’eau et de nutriments; Nutriments; Lagune; Estuaire méditerranéen; Debit; Milieu de transition.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00489/60075/63397.pdf
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Fonctionnement des marais maritimes atlantiques: échanges d'énergie et effets des flux aquacoles diffus ArchiMer
Bel Hassen, Malika.
French estuaries, from the Atlantic coast to the English channel, have been characterized by a poor phytoplankton biomass. The turbidity has always been considered as the limiting factor for phytoplankton. Estuarine ecosystems are situated at the boundary between the land and the sea. Consequently, they are subject to an enrichment by nutrient loadings from upland ecosystems. Although it has been demonstrated that a part of the nutrient loadings support an important benthic production. The part, which escapes to the estuarine benthic and planktonic food web and is exported to adjacent estuarine ecosystems, still remains undetermined. Quantifying the nu trient and particulate matter exchange between a macrotidal Bay, the Fier d'Ars, and the adjacent ocean...
Tipo: Text Palavras-chave: Aquaculture; Exportation; Matière dissoute; Fiers d'Ars; Systèmes d'Information Géographique; Importation; Usages; Lumière; Micorphytobenthos; Modélisation; Nutriments; Matière organique; Matière particulaire; Phytoplancton; Sédimentation; Aquaculture; Export; Dissolved matter; Fier d'Ars Bay; Geographic Information Systems; Import; Land use; Light; Microphytobenthos; Modelling; Nutrients; Organic matter; Particulate matter; Phytoplankton; Sedimentation.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00450/56185/57738.pdf
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Incertitudes des méthodes d’évaluation « eaux littorales » : utilisation de modèles linéaires dynamiques pour l’évaluation des incertitudes des paramètres hydrologiques ArchiMer
Soudant, Dominique; Auby, Isabelle; Daniel, Anne.
L’incertitude associée à une mesure a pour origine d’une part la variabilité environnementale et d’autre part l’ensemble du processus d’acquisition depuis le prélèvement jusqu’à la saisie de la donnée dans une base. L’estimation de l’ensemble de cette variabilité est un exercice complexe à réaliser dans le cadre d’un plan d’expérience. En revanche, les longues séries temporelles de données présentent la caractéristique d’intégrer toutes les variabilités. L’analyse de ces séries en termes de signal et bruit doit permettre de quantifier l’amplitude des incertitudes. Toutefois, les séries temporelles d’observation présentent un ensemble de caractéristiques les rendant difficiles à analyser. Les modèles linaires dynamiques constituent une approche adaptée à...
Tipo: Text Palavras-chave: Incertitude; Température; Turbidité; Matières en suspension; Oxygène dissous; Nutriments; Modèle linaire dynamique; Bassin d’Arcachon; REPHY..
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00441/55306/56821.pdf
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Influence d'un élevage ostréicole sur les flux de nutriments et d'oxygène dans un écosystème lagunaire ArchiMer
Mazouni, Nabila; Deslous-paoli, Jean-marc; Landrein, Sonia.
The impact of suspended oyster culture (Crassostrea gigas, Thunberg) on oxygen and nutrient fluxes has been studied in situ, in a coastal lagoon (Thau, France), during a seasonal cycle. On the first plan of the multiple factorial correspondences analysis (MCA), seasons were well discriminated. The fluxes were maximum in summer and minimum in winter. However, this seasonal pattern was not only linked to the water temperature, as autumn and spring (similar temperatures of about 12 degrees C) were distinct in the second factorial plan (2.3). Oxygen uptake by the oyster cultures varied between 0 mu mol m(-2) h(-1) (January) and 11 823 +/- 377 mu mol m(-2) h(-1) (July). Ammonia and nitrate-nitrites were released into the water column respectively at a rate of...
Tipo: Text Palavras-chave: Oxygen; Nutrients; Fluxes; Oyster culture; Oxygène; Nutriments; Flux; Elevage ostréicole.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/publication-840.pdf
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La baie de Seine : hydrologie, nutriments, chlorophille (1978-1994) ArchiMer
Aminot, Alain; Guillaud, Jean-francois; Kerouel, Roger.
The data of hydrology, nutrients and chlorophyll obtained in the Bay of Seine over the period 1978-1994, from 14 océanographie cruises, are synthetised and illustrated by an atlas. The Bay is a typical example of a coastal area influenced by a large river. In winter, the nutrient input is drained off into the eastern Channel. In spring, nutrients are consumed intensively. Silicate is the first that drops to limiting levels. The spring bloom generally begins in the centre-east of the Bay. Chlorophyll a can reach up to 40-70 µg/l during the year, values typical of eutrophic coastal areas. Despite the regular increase of nitrogen inputs, the biomass (as chlorophyll) has not significantly changed over a fifteen year period.
Tipo: Text Palavras-chave: Chlorophyll; Nutrients; Hydrology; Bay of Seine; Chlorophylle; Nutriments; Hydrologie; Baie de Seine.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/1997/rapport-1428.pdf
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Mezclas de vermicompost y tezontle, diseñadas mediante un programa de optimización en SAS, para el cultivo de tomate bajo invernadero e hidroponía. Colegio de Postgraduados
Cruz Crespo, Elia.
Uno de los aspectos más importantes para el manejo sustentable de los recursos productivos naturales es la incorporación de materia orgánica en el sistema de producción. En los sistemas hidropónicos se ha propuesto la sustitución de los medios de crecimiento no renovables, como turbas, por el uso de compost y vermicompost de materiales diversos. En tomate se ha demostrado que las mezclas con vermicompost influyen en el crecimiento, rendimiento y calidad de los cultivos; sin embargo, la evaluación de las mezclas de sustratos en general, se han llevado a cabo mediante propuestas aisladas no sistematizadas. Por ello, los objetivos de la presente investigación fueron determinar a través de un programa de optimización en SAS, mezclas de vermicompost con...
Palavras-chave: Crecimiento; Nutrimentos; Calidad; Solución de Steiner; Fertilización inorgánica; Growth; Nutriments; Quality; Steiner's nutrient solution; Inorganic fertilization; Doctorado; Edafología.
Ano: 2010 URL: http://hdl.handle.net/10521/293
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Modélisation 0D des efflorescences d'Alexandrium en rade de Brest en compétition inter-spécifique ArchiMer
Le Gland, Guillaume.
Since 2010, planktonic algae Alexandrium minutum, cause of the PSP (Paralytic Shellfish Poisoning) syndrome, has been proliferating in early summer in the bay of Daoulas, within the roadstead of Brest. During this internship, a model has been designed in order to derive these blooms from physical parameters (temperature, irradiance, nutrient supply, dilution rate …). In the model, A.minutum competes with 50 other plankton species with randomly attributed optimal temperature and nutrient uptake abilities. It turns out to reproduce well the bloom of 2012, with a correct date of maximum concentration and a relevant order of magnitude. It reproduces the order of magnitude of 2013 concentrations, but the bloom then is too spread in time around the maximum....
Tipo: Text Palavras-chave: Alexandrium minutum; Phytoplancton; Efflorescence (bloom); Nutriments; Lumière; Température; Dilution; Absorption (uptake); Quota cellulaire; Croissance; Compétition; Modèle; Rade de Brest.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00209/32004/30442.pdf
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Modélisation des blooms de Gymnodinium mikimotoï le long de la façade atlantique française : répartition spatiale ArchiMer
Loyer, Sophie; Lazure, Pascal; Gentien, Patrick; Menesguen, Alain.
In order to study the occurrence of Gymnodinium mikimotoï bloom on the French Atlantic coast, a three-dimensional model of primary production was set up. The biological model was coupled to a hydrodynamic model previously developed at Ifremer, by the intermediary of transport, diffusion and heat fluxes. The cycles of three limiting elements for the phytoplankton growth were modelised: nitrogen, phosphorus and silicon. The second phase of the study aimed at reproducing the summer dinoflagellate blooms. In this new approach a model of the species Gymnodinium mikimotoï was coupled with the previous biomass model which provides the physical and chemical environments. The study focuses on the results obtained by this specific sub-model. The parametrisation was...
Tipo: Text Palavras-chave: Turbulence; Dinoflagellés; Gymnodinium mikimotoï; Modèle; Nutriments; Turbulence; Dinoflagellate; Gymnodinium mikimotoï; Model; Nutrients.
Ano: 2001 URL: https://archimer.ifremer.fr/doc/00479/59100/61738.pdf
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Modélisation du devenir à moyen terme dans l'eau et le sédiment des éléments majeurs (N, P, Si) rejetés par la Seine en Baie de Seine ArchiMer
Cugier, Philippe.
The Bay of Seine is a coastal ecosystem submitted to a large river input (Seine river), which brings important quantities of nutrients. This nutrient enrichment leads to frequent eutrophication events and, from the beginning of the eighties, regular toxic phytoplanktonic (Dynophysis) blooms are observed. In order to study the nutrient cycles (nitrogen, phosphorus, silica) and their contribution to phytoplanktonic stock regulation, a three dimensional model has been developed, based on the coupling between an hydrodynamic part taking into account sediment dynamics (SAM-3D) and an ecological part, which accounts for the main biological compartments and processes. This model is able to reproduce the main physical and biological characteristics of the...
Tipo: Text Palavras-chave: Bay of Seine (France); Dinoflagellates; Nutrients; Nutrients; Eutrophication; Sediments; Hydrodynamic; Mathematical models; Baie de (France); Seine; Dinoflagellés; Diatomées; Nutriments; Eutrophisation; Sédiments (géologie); Hydrodynamique; Modèles mathématiques.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/these-3220.pdf
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Origine et devenir de la matière organique au sein du micro-estuaire temporaire de Fiume Santu (L’Agriate, Haute-Corse) ArchiMer
Massey, Jean-laurent.
In relation with meteorological, hydrological and topographic characteristics, Corsica has a very large number of temporarily open/closed micro-estuaries. Agriates contains several of them, including the Fiume Santu’s temporarily micro-estuary. These ecosystems are specific because of their sporadic connection with the sea. The opening and closure depends on both the river flow and the presence of the Posidonia oceanica (L.) Delile “banquettes”. Characterization of the global functioning was based on a multiparameter approach (particulate matter and dissolved inorganic matter descriptors, carbon and nitrogen stable isotope, phytoplankton communities), in order to qualify and quantify the organic matter (OM), along an estuary – coastal zone gradient. The OM...
Tipo: Text Palavras-chave: Corsica; Fiume Santu; Micro-estuaire temporaire; Matière organique; Isotopes stables; Nutriments; Phytoplancton; Corsica; Fiume Santu; Temporarily open/closed micro-estuary; Organic matter; Stable isotope; Nutrients; Phytoplankton.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00276/38691/37188.pdf
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Production en masse de Skeletonema costatum en bassins extérieurs par fertilisation minérale : étude d'un cycle estival ArchiMer
Gautier, Dominique; Ledu, Christophe; Hussenot, Jerome; Gerard, Andre.
La production en masse de Skeletonemca costatum par fertilisation minérale ((N, P, Si) a été étudiée à l'écloserie IFREMER de Ronce-les-Bains sur un bassin de 200 m3 à fond bâché endant un cycle de 11 jours en juillet 1992. (...)
Tipo: Text Palavras-chave: Phyoplancton; Nutriments; Production en masse; Skeletonema costatum; Diatomées.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00020/13113/10121.pdf
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