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| Registros recuperados: 30 | |
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| Bardouil, Michele; Masselin, Pierre; Bohec, Madeleine. |
| Laboratory assays have been performed, using mussels contamined with Dinophysis, in order to assess potential depurations kinetics. Mussels samples from Seine bay, Douarnenez bay and Vilaine bay have been tested . From these assays, which are to be performed in 1989; two main results are stressed : 1) when the toxicity level is near 0,5 MU/g of hepatopancreas*, depuration is undedectable during twelve days, 2) when the toxicity level exceeds 1 MU/g,depuration is important during the first eight days. *(quarantine level used by Japanese authorities) . |
| Tipo: Text |
Palavras-chave: Moules; DSP; Dinophysis; Décontamination; Blue mussels; DSP; Dinophysis; Depuration. |
| Ano: 1989 |
URL: http://archimer.ifremer.fr/doc/00430/54148/55479.pdf |
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| Lassus, Patrick; Maggi, Pierre; Proniewski, F.; Truquet, Philippe; Bardouil, Michele. |
| Since 1987 Antifer oil tanker terminal (Normandy, France) was weIl known, as a preferential area for summer highest blooms of Dinophysis cf acuminata, a toxic dinoflagellate. Three oceanographic cruises were made in August 1989, before, in the course of and after the seasonal max. of this species. Results obtained from these cruises (hydrological parameters and phytoplankton) as weIl as from a daily survey at a reference station in Antifer harbour, corrobora te the prevailing role of coastal up flowing of Seine estuarine waters, pushed to the coast by a dominant S - SW wind, on intensity and duration of Dinophysis bloom. Such observations are in agreement with those of Summer 1987 at reference station. |
| Tipo: Text |
Palavras-chave: Antifer; Dinophysis; Hydrologie; Phytoplancton; Antifer; Dinophysis; Hydrology; Phytoplankton. |
| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00138/24946/23039.pdf |
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| Le Dean, Loic; Gauthier, Franck. |
| Nous avons réalisé cette étude dans le but de fournir aux agents d'IFREMER chargés de la surveillance des eaux littorales et en particulier de la flore phytoplanctonnique, un outil permettant d'identifier et de compter les cellules de Dinophysis de façon automatique. La visionique nous semblant être une discipline qui se prêtait à ce type de détection, nous avons réalisé une étude de faisabilité d'un système d'analyse d'il}1age appliqué à la reconnaissance et au comptage de Dinophysis. Le capteur utilisé est une caméra J.V.C Tri C.C.D transmettant trois images (rouge - verte - bleue) à un ordinateur compatible A.T.. Celui ci est équipé d'un ensemble de cartes MATROX de numérisation et traitement d'images et d'un coprossesseur arithmétique. Les applications... |
| Tipo: Text |
Palavras-chave: Dinophysis; Phytoplancton; Visionique; Reconnaissance de forme; Segmentation; Binarisationcontours. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00136/24714/22768.pdf |
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| Soudant, Dominique. |
| L'objectif de ce travail était de mettre en place un outil mathématique permettant de prévoir les concentrations en Dinophysis cf. acuminata, micro-algue toxique. Nous avons décidé d'utiliser des méthodes dynamiques de prévision bayésienne : modèles polynomiaux du premier, second et troisième ordre, modèle polynomial du premier ordre avec intervention, et modèle de régression multilinéaire. Les modèles polynomiaux du premier, second et troisième ordre se sont avérés inadaptés. Le modèle de régression multilinéaire a été testé avec les variables concentrations en phosphate (PO4) et en nitrate (NO3). Ce modèle est insatisfaisant du fait de l'inconstance des relations entre la concentration en Dinophysis cf. acuminata et les régresseurs. Le modèle polynomial... |
| Tipo: Text |
Palavras-chave: Modèle dynamique bayésien; Prévision; Séries chronologiques; Dinophysis; Antifer. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00430/54178/55519.pdf |
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| Soudant, Dominique. |
| Le Dinophysis est une microalgue toxique à l’origine d’epidémies diarrhéiques. En dépit de nombreuses études, l’écologie et la biologie de ce genre phytoplanctonique restent mal connues. Afin de déterminer les conditions d’apparition de Dinophysis cf. acuminata sur le site d’Antifer (Normandie, France), des prélèvements d’eau de mer ont été effectués quasi-journellement pendant les périodes estivales des années 1987 à 1993. Les séries temporelles résultantes concernent la concentration de la microalgue et les facteurs chimiques, physiques et météorologiques. L’analyse de ces données à l’aide d’outils sta- tistiques classiques (e.g. régression) s’est avérée difficile (e.g. instabilité temporelle des résultats). Une caractéristique commune de ces méthodes... |
| Tipo: Text |
Palavras-chave: Modélisation; Statistique; Dynamique; Séries temporelles; Bayésien; Dinophysis; Baie de Seine. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00015/12576/9446.pdf |
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| Soudant, Dominique; Beliaeff, Benoit; Thomas, G. |
| Classical regression analysis can be used to model time series. However, the assumption that model parameters are constant over time is not necessarily adapted to the data. In phytoplankton ecology, the relevance of time-varying parameter values has been shown using a dynamic linear regression model (DLRM). DLRMs, belonging to the class of Bayesian dynamic models, assume the existence of a non-observable time series of model parameters, which are estimated on-line, i.e. after each observation. The aim of this paper was to show how DLRM results could be used to explain variation of a time series of phytoplankton abundance. We applied DLRM to daily concentrations of Dinophysis cf. acuminata, determined in Antifer harbour (French coast of the English... |
| Tipo: Text |
Palavras-chave: Phytoplankton; Dinophysis; Time series; Regression; Dynamic; Bayesian. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00337/44784/44490.pdf |
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| Graneli, Edna; Anderson, Donald M; Carlsson, Per; Maestrini, Serge Y. |
| The marine dinoflagellate genus Dinophysis includes species that are the causative agents of diarrhetic shellfish poisoning (DSP). Recent findings indicate that some Dinophysis species are mixotrophic, i.e. capable of both autotrophic and heterotrophic nutrition. We investigated inorganic (and organic) carbon uptake by several species of Dinophysis in the Light and dark using the 'single-cell C-14 method', and compared uptake rates with those of photosynthetic Ceratium species and heterotrophic dinoflagellates in the genus Protoperidinium. Experiments were conducted with water from the Gullmar Fjord and from the Koster Strait (Swedish west coast). Nutrient-enriched phytoplankton from surface water samples were concentrated (20 to 70 mu m) and incubated at... |
| Tipo: Text |
Palavras-chave: Dinophysis; Growth rate; Mixotrophy; Carbon uptake; Ceratium; Protoperidinium. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00336/44679/45050.pdf |
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| Belin, Catherine; Raffin, Bernard. |
| This document presents the results obtained through the French Phytoplankton and Phycotoxins Monitoring Network (REPHY), concerning the presence of toxic and harmful phytoplankton species along the French coast, from 1984 to 1995. The network REPHY is briefly described. Then the different species, and their associated events, are reviewed : first, species toxic to shellfish consumers, e.g. Dinophysis spp. and Alexandrium minutum, which respectively produce diarrheic and paralytic toxins ; then, species which are toxic or harmful for marine fauna (fish, shellfish). The monitoring results are preceded by the main knowledge on taxonomy, distribution, biology, ecology and toxicity of the concerned species. A final synthesis illustrates the distribution of... |
| Tipo: Text |
Palavras-chave: Phytoplancton; Phycotoxines; Surveillance; Espèces toxiques; Espèces nuisibles; Dinophysis; Alexandrium; DSP; PSP; Secteurs fermés; Phytoplankton; Phcotoxins; Monitoring; Toxic species; Harmful species; Dinophysis; Alexandrium; DSP; PSP; Closed areas. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/00094/20514/18184.pdf |
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| Amzil, Zouher; Royer, Florence; Sibat, Manoella; Fiant, Liliane; Gelin, Muriel; Le Gal, Dominique; Francoise, Sylvaine. |
| In the context of the French phytoplankton and phycotoxins monitoring network (REPHY), shellfish scallops were harvested systematically during the authorised fishing season for the purpose of investigating paralytic toxins (PSP-mouse test), amnesic toxins (ASPchemical analysis), and lipophilic toxins (DSP-mouse test). For all shellfish samples that tested positive in the DSP mouse bioassay used for lipophilic toxins detection, liquid chromatography coupled with mass spectrometry (LC-MS/MS) was used to search for the following lipophilic toxins: okadaic acid, dinophysistoxins, pectenotoxins, azaspiracids, yessotoxins, spirolides, and gymnodimine. In order to investigate the presence of okadaic acid esters (DTX3), alkaline hydrolysis was performed on all... |
| Tipo: Text |
Palavras-chave: Scallops; Domoic acid; Okadaic acid and derivatives; Dinophysis. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00015/12577/9447.pdf |
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| Registros recuperados: 30 | |
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