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| Registros recuperados: 30 | |
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| Zendong, Suzie Zita; Kadiri, Medina; Herrenknecht, Christine; Nezan, Elisabeth; Mazzeo, Antonia; Hess, Philipp. |
| Algal toxins may accumulate in fish and shellfish and thus cause poisoning in consumers of seafood. Such toxins and the algae producing them are regularly surveyed in many countries, including Europe, North America, Japan and others. However, very little is known regards the occurrence of such algae and their toxins in most African countries. This paper reports on a survey of phytoplankton and algal toxins in Nigerian coastal waters. Seawater samples were obtained from four sites for phytoplankton identification, on three occasions between the middle of October 2014 and the end of February 2015 (Bar Beach and Lekki in Lagos State, Port Harcourt in Rivers State and Uyo in Akwa Ibom State). The phytoplankton community was generally dominated by diatoms and... |
| Tipo: Text |
Palavras-chave: Dinoflagellates; Dinophysis; Phycotoxins; Untargeted analysis; Phytoplankton. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00314/42521/41893.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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| Derrien, Amelie; Terre Terrillon, Aouregan; Duval, Audrey; Lebrun, Luc; Doner, Anne; Rovillon, Georges-augustin; Amzil, Zouher; Le Bec, Claude. |
| En cas de fermeture de zone de production pour cause de présence d'une espèce de micro algues toxique, une mesure prévoit pour les professionnels de la conchyliculture l'interdiction générale d'utilisation de l'eau de mer déjà pompée dans un bassin insubmersible. C'est dans ce contexte que la DGAL a sollicité l'appui du LER BO pour la mise en place d'une étude dans des conditions professionnelles. Cette étude vise à déterminer d'il existe un risque de contamination lors de l'immersion de coquillages non contaminés dans un bassun insubmersible rempli en eau de mer pompée dans une zone fermée pour cause de présence de micro-algues toxiques. Entre fin juin et début juillet, la présence de Dinophysis sp a entraîné la fermeture de la baie de Concarneau. Des... |
| Tipo: Text |
Palavras-chave: Dinophysis; Toxines lipophiles; Acide okadaïque; Yessotoxines; Bassin insubmersible; Huîtres; Moules. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00486/59736/62831.pdf |
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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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| Gaillard, Sylvain; Charrier, Aurelie; Malo, Florent; Carpentier, Liliane; Bougaran, Gael; Hégaret, Helene; Réveillon, Damien; Hess, Philipp; Séchet, Veronique. |
| The cryptophyte Teleaulax amphioxeia is a source of plastids for the ciliate Mesodinium rubrum and both organisms are members of the trophic chain of several species of Dinophysis. It is important to better understand the ecology of organisms at the first trophic levels before assessing the impact of principal factors of global change on Dinophysis spp. Therefore, combined effects of temperature, irradiance and pH on growth rate, photosynthetic activity and pigment content of a temperate strain of T. amphioxeia were studied using a full factorial design (central composite design 23*) in 17 individually controlled bioreactors. The derived model predicted an optimal growth rate of T. amphioxeia at a light intensity of 400 µmol photons · m‐2 · s‐1, more... |
| Tipo: Text |
Palavras-chave: Dinophysis; Ecophysiology; Full factorial design; Global change; Mesodinium rubrum; Teleaulax amphioxeia. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00609/72155/70910.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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| Haraguchi,Lumi; Odebrecht,Clarisse. |
| Os dinoflagelados da ordem Dinophysiales representam um grupo morfologicamente diverso e ecologicamente heterogêneo, incluindo espécies autotróficas, mixotróficas e heterotróficas, outras contendo endossimbiontes ou ainda produtoras de ficotoxinas. No presente trabalho, foram identificadas as espécies de Dinophysis, Ornithocercus, Histioneis e Amphisolenia em águas costeira e oceânica na região Sul do Brasil, ao largo do Cabo de Santa Marta Grande, SC e Albardão-Chuí, RS. Arrastos verticais foram realizados com rede de plâncton (20 µm) à bordo do N. O. Atlântico Sul em 33 estações oceanográficas visitadas em agosto/setembro de 2005 (inverno) e fevereiro de 2007 (verão). As amostras de plâncton foram fixadas com formol (4%) e analisadas com o auxílio de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biodiversidade; Dinoflagelados; Dinophysis. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000300011 |
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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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| 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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| 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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| 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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| 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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| Registros recuperados: 30 | |
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