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Registros recuperados: 127
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A new device for in situ video and fluorescence analysis of marine particles. Applications to phytoplankton studies. ArchiMer
Lunven, Michel; Lehaitre, Michel; Nascimben, Eric; Rouvillain, Julien; Berric, Roger; Le Gall, Erwan; Gentien, Patrick.
A new video-microscope has been developed for in situ investigation on marine particles. A field of view is produced by a laser beam at 473 nm. Individual cells or particles that entered this field of view appear as individual diffraction-limited spots of light, which are resolved from the dark background. A mobile high-pass optical filter (610 nm) can be controlled and displaced in front of the CCD camera, allowing simultaneously imaging and discrimination between fluorescing and non-fluorescing particles. We have the possibility to add a band pass filter for phycoerytrin detection. The system allows white light visualisation of particles ranging from 10 µm to several millimetres, depending on the zoom magnification. With the 610 nm high pass filter, the...
Tipo: Text Palavras-chave: Surveillance; Phytoplancton; Phycotoxine.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/00144/25495/23649.pdf
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A non-linear software sensor to monitor the internal nitrogen quota of phytoplanktonic cells ArchiMer
Bernard, O; Sciandra, A; Sallet, G.
New techniques - called software sensors - issued from the non-linear automatic control field and initially developed for non-linear chemical systems have been applied to a continuous culture of phytoplankton. A software sensor (or 'observer') combines an analytical differential equation based model and partial measurements of the system in order to estimate the non-measured state variables. It filters data and estimates the actual state of living systems, models of which are often rough approximations. The efficiency of this approach is illustrated with a nitrate-limited chemostat experiment with the chlorophyceae Dunaliella tertiolecta performed in a computer controlled fluctuating environment. (C) 2001 Ifremer/CNRS/IRD/Editions scientifiques et...
Tipo: Text Palavras-chave: Modèle de Droop; Systèmes non linéaires; Observateurs; Phytoplancton; Droop model; Non-linear systems; Observers; Phytoplankton.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00322/43340/42888.pdf
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Abondance et composition du phytoplancton sur les lagunes méditerranéennes oligo et mésohalines ArchiMer
Derolez, Valerie; Bec, Béatrice; Grillas, Patrice; Sanchez, Ana Elena; Raimbault, Patrick.
In the context of WFD implementation on Mediterranean lagoons, work has been carried out since 2010 by Ifremer, Tour du Valat and IRSTEA (Onema and AERM & C fundings), to assess the relevance of macrophytes and macrofauna indicators for oligohaline and mesohaline lagoons (mean salinity <18 PSU). The question of the relevance of indicator metrics and thresholds for the "phytoplankton" biological quality element also arises, especially due to the confined nature of olgo-mesohaline lagoons. The objective of this study is to characterize the abundance and composition of phytoplankton on 5 oligo and mesohaline lagoons of the French Mediterranean coast (Scamandre, Crey, Charnier, Bolmon and Grand Palun). Analyses of accessory pigments (chlorophyll and...
Tipo: Text Palavras-chave: Lagunes; Méditerranée; Oligohalin; Mésohalin; Phytoplancton; Cytométrie; Pigments chlorophylliens; Lagoons; Mediterranean Sea; Oligohaline; Mesohaline; Phytoplankton; Cytometry; Chlorophyll pigments..
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00357/46816/46682.pdf
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Acquisition de données complémentaires aux dénombrements, avec les techniques d’analyses pigmentaires et de diversité génétique. Etat d’avancement et premiers résultats. Action Indice Composition. Livrable n° AIV. Rapport final, 16 juillet 2014. ArchiMer
Delmas, Daniel; Siano, Raffaele.
Studies on phytoplankton community diversity cannot be limited microphytoplankton (cells>20 ìm), it is indeed necessary to take into account also the nano (3-20ìm) picophytoplankton (<3 ìm) components. In the frame of this work aimed at studying temporal phytoplankton community diversity two complementary methodologies of phytoplankton sample analysis, pigment and genetic (metarbarcoding) diversity, have been used as alternative to routine morphological analysis carried out at light microscopy. The REPHY station (047-P-016 Concarneau Large) off-shore the Concarneau Bay has been sampled during the annual highest phytoplankton production (March-July 2012) with a frequent sample interval strategy (twice per week). Results obtained by both pigment and...
Tipo: Text Palavras-chave: Phytoplancton; Structure de taille; Picophytoplancton; Nanophytoplancton; Microphytoplancton; Diversité génétique; Metabarcoding; Taxonomie pigmentaire; Façade atlantique; Baie de Concarneau; Phytoplankton; Size classes; Picophytoplankton; Nanophytoplankton; Microphytoplankton; Genetic diversity; Metabarcoding; Pigment taxonomy; Atlantic coasts; Concarneau Bay.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00361/47260/47225.pdf
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Amélioration des productions phytoplanctoniques en écloserie de mollusques : caractérisation des microalgues fourrage ArchiMer
Robert, Rene; Chretiennot-dinet, Marie-josèphe; Kaas, Raymond; Martin-jezequel, Véronique; Moal, Jeanne; Le Coz, Jean-rene; Nicolas, Jean-louis; Bernard, Eudes; Connan, Jean-paul; Le Dean, Loic; Le Gourrierec, Gaetane; Leroy, Bertrand; Quere, Claudie.
in mollusc hatcheries. Consequently, we assessed themost commonly used species to establish their growth and size profiles, their cytomorphological, biochemical, biomolecular identification as well as their cytometer signs, and also their ability to grow under extreme conditions of temperature and salinity. This work aimed at matching the conformity of the strains used in Argenton (dispatched to most of the French commercial hatcheries) to those of a referenced culture collection. A previous screening preceded this study, because of the 45 species and/or clones held originally, Argenton kept no more than 15 species. As most of the latter are also represented in referenced collection, our strains are therefore correctly identified. On the other hand, the...
Tipo: Text Palavras-chave: Ecological limits; Biomolecular profile; Flow cytometry; Biochemical composition; Cytomorphology; Phytoplankton; Mollusc; Hatchery; Ecotolérance; Profil biomoléculaire; Cytométrie en flux; Composition biochimique; Cytomorphologie; Phytoplancton; Mollusques; Ecloserie.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/rapport-1546.pdf
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Application of a digital pattern recognition system to Dinophysis acuminata and D-sacculus complexes ArchiMer
Truquet, Philippe; Lassus, Patrick; Honsell, Giorgio; Le Dean, Loic.
An image discrimination technique was developed to improve specific identification of some toxic Dinophysis cells (marine dinoflagellates involved in diarrhoeic shellfish poisoning), especially the ''acuminata'' and ''sacculus'' groups, which can be present at different ratios in natural sea-water samples collected during toxic episodes. This work was performed with image analysis software SAMBA (TITN Alcatel) using preserved cells directly observed through an inverted microscope and recorded with a video camera before further processing. All morphometric parameters used for discrimination of 7 different species or morphotypes of Dinophysis were tested with discriminant analysis. This study indicates that Dinophysis sp. and D. pavillardi seem well...
Tipo: Text Palavras-chave: Dinophysis sp.; Analyse d'image; Taxonomie; Phytoplancton; Dinophysis sp; Image analysis; Taxonomy; Phytoplankton.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00188/29890/28337.pdf
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Ballast water research in France : Current status ArchiMer
Masson, Daniel; Courtois, Olivier; Masson, Nadine; Guesdon, Stephane; Rocher, Gregory.
Due to important economic activities along the French oastline, the introduction of noxious organisms into French coastal waters, particularly by ship ballast water, may have serious consequences. After preliminary studies of ship movements in Charente Maritime, several samplings of ballast water and sediment were made. Samples were taken in five major harbours in France, along the Atlantic, Channel and Mediterranean coastlines. The main task of this first assessment was the research for exotic and possibly noxious phytoplancton. Clostridium and Vibrio bacteria were also tested for. The results are presented and discussed, with plans for further work.
Tipo: Text Palavras-chave: Bacteria; Phytoplancton; French coastal waters; Ballast water.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/2000/acte-7364.pdf
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Bancarisation des données planctoniques des campagnes halieutiques ArchiMer
Thomas, Amandine; Baudrier, Jerome; Gauthier, Emilie.
Cette étude fait état de la collecte des données planctoniques actuellement effectuée à bord des six campagnes halieutiques affiliées au programme DCF et optimisées pour les besoins de la surveillance liée à la DCSMM. Ce document contient des propositions de structuration en vue d’une bancarisation de ces données dans le système d’information Quadrige pour qu’elles puissent être accessibles à tous.
Tipo: Text Palavras-chave: DCSMM; Campagnes halieutiques; DCF; Base de données; Phytoplancton; Zooplancton; Bancarisation; Quadrige; IBTS; CGFS; PELGAS; EVHOE; PELMED; MEDITS..
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00513/62496/66807.pdf
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Bassin Adour-Garonne : hydrologie et phytoplancton – Résultats 2013-2018 ArchiMer
Auby, Isabelle; D'Amico, Florence; Meteigner, Claire; Rumebe, Myriam; Tournaire, Marie-pierre; Rigouin, Loic; Gouriou, Laure; Lissardy, Muriel; Sanchez, Florence; De Casamajor, Marie-noelle; Morandeau, Gilles; Ganthy, Florian; Trut, Gilles; Trut, Florence; Caill-milly, Nathalie; Oger-jeanneret, Helene; Guesdon, Stephane; Chabirand, Jean-michel; Morin, Dimitri; Piraud, Aude; Geairon, Philippe; Grizon, James; Seugnet, Jean-luc; Thomas, Gerard; Bruneau, Audrey; Soudant, Dominique; Gautier, Emeric; Michel, Valérie; Dupin, Michel.
Ce rapport rend compte des résultats sur les paramètres hydrologiques et le phytoplancton acquis dans le cadre de la DCE (contrôle de surveillance entre 2013 et 2018), dans les masses d’eau côtières et de transition du bassin Adour-Garonne
Tipo: Text Palavras-chave: Directive Cadre sur l’Eau; Hydrologie; Phytoplancton.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00516/62735/67113.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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Bilan des observations hydrologiques du secteur côtier au large de la Loire et de la Vilaine en 2016 ArchiMer
Retho, Michael; Bizzozero, Lucie; Le Merrer, Yoann; Manach, Soazig; Collin, Karine; Fortune, Mireille; Schmitt, Anne; Gabellec, Raoul; Souchu, Philippe; Cochennec-laureau, Nathalie.
Ce rapport décrit le contexte hydrologique du littoral côtier du Morbihan, de la Loire Atlantique et de la Vendée Nord, sous l'influence des deux fleuves la Loire et la Vilaine, durant l'année 2016. Il s'appuie sur les suivis environnementaux réalisés dans le cadre des réseaux REPHY et DCE, complétés par les données acquises en haute fréquence sur la bouée MOLIT (réseau COAST HF-HOSEA).
Tipo: Text Palavras-chave: Hydrologie; DCE; Nutriment; Loire Bretagne; REPHY; Phytoplancton.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00416/52720/53593.pdf
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Bilan des observations hydrologiques du secteur côtier au large de la Loire et de la Vilaine en 2017 ArchiMer
Collin, Karine; Bizzozero, Lucie; Le Merrer, Yoann; Retho, Michael; Souchu, Philippe; Cochennec-laureau, Nathalie; Schapira, Mathilde; Manach, Soazig.
Ce rapport décrit le contexte hydrologique du littoral côtier du Morbihan, Pays de Loire et Nord Vendée, sous l’influence de la Loire et de la Vilaine, durant l’année 2017. Il s’appuie sur les suivis environnementaux réalisés dans le cadre des réseaux REPHY et de la DCE, complétés des données acquises en haute fréquence sur la bouée MOLIT (réseau COAST-HF).
Tipo: Text Palavras-chave: Hydrologie; DCE; Nutriment; Loire Bretagne; Rephy; Phytoplancton.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00472/58410/60972.pdf
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Bilan des perturbations phytoplanctoniques observées sur les côtes françaises en 1986 ArchiMer
Belin, Catherine; Berthome, Jean-paul.
In 1986, 23 discolored waters were observed ; dinoflagellates often were the cause of them. Many developments of Prorocentrum minimum occured ; two of them were associated with shel1fishes mortalities. At contrary, other species which are suspected to be toxic for shellfishes, as Gyrodinium aureolum and Gyrodinium spirale, have not been associated with mortalities, although they have been observed in several areas. The developments of Dinophysis (cf. acuminata or sacculus) caused provisional prohibitions of shellfishes selling, especially in the south of Brittany. Another specie was also implicated in toxicities : Prorocentrum lima. Human intoxications and economic consequences were rather important.
Tipo: Text Palavras-chave: Phytoplancton; Toxicité; Surveillance; Santé publique; Mollusque; Phytoplankton; Toxicity; Survey; Public health; Mollusc.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00094/20541/18206.pdf
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Bilan méthodologique de l’outil de diagnostic de l’eutrophisation du RSL. Quatorze années de résultats en Région Languedoc-Roussillon ArchiMer
Ifremer.
Ce travail présente un bilan de l’outil de diagnostic de l’eutrophisation mis en oeuvre depuis 2000 dans le cadre du Réseau de Suivi Lagunaire. Cet outil repose sur l’étude de quatre compartiments : sédiments, macrophytes, colonne d’eau et phytoplancton. Un récapitulatif de la méthode actuelle de diagnostic et de ses évolutions depuis le début du RSL est présenté (pour chacun des compartiments puis pour la méthode de diagnostic complet). Des analyses statistiques ont permis d’étudier la pertinence de la stratégie de suivi et de la grille de diagnostic de chaque compartiment. Les résultats permettent de préconiser un maintien des stratégies de prélèvements du sédiment et des macrophytes et l’arrêt des suivis annuels de la colonne d’eau et du phytoplancton...
Tipo: Text Palavras-chave: Réseau de Suivi Lagunaire; Lagune; Eutrophisation; Méthode de diagnostic; Sédiment; Macrophytes; Phytoplancton; Colonne d’eau; Prélèvement; Analyse; Grille de qualité; DCE.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00165/27662/25839.pdf
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Biomasse et production primaire du phytoplancton et du microphytobenthos de deux biotopes sableux (Golfe de Fos, France) ArchiMer
Plante-cuny, Marie-reine; Bodoy, Alain.
The primary production (phytoplankton and microphytobenthos) of a coastaL shallow water ecosystem (0.5 m) was investigated in two sandy areas, differing by their wave exposure. The physical and chemical parameters, the functional chlorophyll and pheopigments as well as the primary production were measured monthly, throughout a two-year study. The bivalve Ruditapes decussatus was the dominant species in the sheltered station (RD), whereas Donax trlmcu/us inhabited the other station (DT) which was exposed to the open-sea waves. Microphytic biomasses were determined after extracting chlorophyll a and pheopigments in 90% acetone. by spectrophotometric measurements before and after acidification. Gross hourly primary production was estimated by measuring the...
Tipo: Text Palavras-chave: Biomasse; Production primaire; Phytoplancton; Microphytobenthos; Mediterranee; Biomass; Primary production; Phytoplancton; Microphytobenthos; Mediterranean.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/1987/publication-2870.pdf
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Calcul d’un indice de composition phytoplanctonique pigmentaire pour les eaux guyanaises (DCE) ArchiMer
Lampert, Luis.
This study suggests an WFD composition index built with phytoplankton pigments (HPLC) gathered during 2013-2015 samplings in coastal water body of French Guiana.
Tipo: Text Palavras-chave: Guyane française; DCE; Phytoplancton; Indice de composition; ICBC.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00389/50040/50623.pdf
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Campagne de surveillance DCE 2015 en Méditerranée française. Districts « RHONE ET COTIERS MEDITERRANEENS » ET « CORSE » ArchiMer
Witkowski, Fanny; Andral, Bruno; Derolez, Valerie; Tomasino, Corinne.
Sur la façade méditerranéenne, l'Ifremer a assuré en 2015 une partie logistique de la quatrième campagne du contrôle de surveillance DCE et la coordination de la caractérisation de plusieurs éléments de qualité. Les résultats de la quatrième campagne de contrôles de surveillance DCE permettent de caractériser la qualité de 45 masses d’eau littorales suivies en 2015. Dans le district « Rhône et côtiers méditerranéens » (volet 1), 3 des 18 masses d’eau côtières (MEC) sont déclassées pour la chimie au regard des résultats acquis dans la matière vivante, tandis que l'ensemble des MEC suivies pour le phytoplancton affichent un bon état. Dans les masses d’eau de transition (MET), la chimie matière vivante déclasse 7 MET, le suivi dans l'eau (échantillonneurs...
Tipo: Text Palavras-chave: Surveillance; Phytoplancton; Macrophytes; Substances prioritaires; Bioaccumulation; État biologique; État chimique; Eaux côtières; Eaux de transition.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00394/50583/51272.pdf
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Caractéristiques hydrobiologiques de quatre secteurs ostréicoles de la Baie de Bourgneuf en 1987 ArchiMer
Baud, Jean-pierre; Haure, Joel; Marion, Anne; Robert, Jean-michel.
Une étude hydrobiologique de quatre secteurs ostréicoles a été menée de mars à octobre 1987. Les eaux de la baie de Bourgneuf sont favorables à l'ostréiculture en raison de leurs teneurs en chlorophylle, sels nutritifs et seston. Les caractéristiques hydrobiologiques sont cependant différentes entre les secteur nord et sud, ces derniers présentant des conditions de milieu d'élevage plus stables. Le gradient de richesse phytoplanctonique de la zone intertidale proche du continent est orientée selon la veine principale du courant résiduel des masses d'eau, avec une décroissance marquée du nord au sud. Le secteur le plus nord (S3) est en période estivale une zone à forte probabilité de développement de dinoflagellés durant les marées de vives eaux. La zone du...
Tipo: Text Palavras-chave: Hydrobiologie; Ostréiculture; Phytoplancton; Baie de Bourgneuf.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00048/15879/13301.pdf
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Comprendre la structure et la dynamique du phytoplancton en réponse aux forçages naturels et anthropiques, et contribuer au développement des outils d’analyses automatisées. Vers un Système Intégré d’Observation. ArchiMer
Lefebvre, Alain.
Les écosystèmes marins sont soumis à des pressions d’origine anthropique très importantes depuis ces dernières décennies. Parmi ces pressions, les apports excessifs de nutriments vont impacter directement le phytoplancton et indirectement d’autres niveaux trophiques compromettant ainsi les biens et services écosystèmiques. On parle alors d’eutrophisation, phénomène répandu à l’échelle mondiale. La Manche orientale et la baie sud de la mer du Nord ne font pas exception. La partie française de cette zone est marquée par des proliférations massives de la Prymnésiophycée, Phaeocystis globosa, qui aboutiront au développement d’une mousse abondante et nauséabonde sur le littoral comme à des dysfonctionnements au sein des habitats benthique et pélagique. C’est...
Tipo: Text Palavras-chave: Manche; Baie sud de la mer du Nord; Eutrophisation; Habitat pélagique; Phytoplancton; Abondance; Diversité; Hydrologie; Climat; Observation; Surveillance; Écologie numérique; Modélisation; Haute fréquence; Systèmes automatisés; Stations instrumentées; Ferry Box..
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00360/47103/47027.pdf
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Compte Rendu Atelier Phyto Grand Ouest 2017 ArchiMer
Manach, Soazig; Neaud-masson, Nadine.
L’édition 2017 de l’Atelier Phyto du Grand Ouest s’est déroulé les 19 et 20 janvier au LER/MPL de la Trinité sur Mer. Pour cette quatrième édition, 14 analystes du phytoplancton marin de différents LERs (Normandie, Bretagne Nord, Bretagne Occidentale et Morbihan Pays de Loire) se sont réunis afin d’échanger sur les différents problèmes rencontrés, cette année, au cours des identifications et dénombrements du phytoplancton. La coordination REPHY et un agent de DYNECO-PELAGOS se sont joints aux réflexions. Les discussions ont porté principalement sur l’indentification des espèces et l’harmonisation des pratiques de saisies dans la base de données Quadrige².
Tipo: Text Palavras-chave: Phytoplancton; Taxinomie.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00388/49963/50541.pdf
Registros recuperados: 127
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