Consulta: creatorFacets:"Lunven, Michel"
Registros recuperados: 37
Data/hora: 05/06/2024 19:09:15

Optimisation de l’identification et du dénombrement du microphytoplancton avec le système couplé de numérisation et d’analyse d’images FlowCAM – Zoo/PhytoImage (système innovant). Action 9 – Livrable 3. Evolution du matériel de numérisation : prototype FastCAM et perspectives. Rapport final, février 2016
Provedor de dados: 5
Autores: Colas, Florent; Tardivel, Morgan; Evrard, Justine; Forest, Bertrand; Crassous, Marie-pierre; Lunven, Michel; Danielou, Marie-madeleine.
This deliverable contains all development work of the FastCAM, new tool for fast imaging of the phytoplankton, which took place in 2015. It consists of: One report of the FastCAM and its comparison with the FlowCAM presentation: The FlowCAM enables the digitalization of a sample of phytoplankton with X10 and X 4 magnifications. The first allows a better morphological description and therefore a higher taxonomic resolution but with a longer scan time (16 X). Thus, for routine analyses, only scanning at 4 X is possible. A considerable gain would be able to do an acquisition to the magnification 10 X with a time of analysis more short, comparable to 4 X. A fast flow imaging system has therefore developed in this sense. He was called FastCAM. The system is...
Tipo: Text
Palavras-chave: FlowCAM; FastCAM; Imagerie rapide; Phytoplancton; REPHY.; FlowCAM; FastCAM; Fast imaging; Phytoplankton; REPHY.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00363/47420/47425.pdf

Nutrient and phytoplankton distribution in the Loire River plume (Bay of Biscay, France) resolved by a new Fine Scale Sampler
Provedor de dados: 5
Autores: Lunven, Michel; Guillaud, Jean-francois; Youenou, Agnes; Crassous, Marie-pierre; Berric, Roger; Le Gall, Erwan; Kerouel, Roger; Labry, Claire; Aminot, Alain.
A new Fine Scale Sampler (FSS) was designed and used in the Loire River plume (Bay of Biscay, France) in order to study phytoplankton distribution in highly stratified water columns. The FSS consists of a linear array of 15 sampling bottles, set horizontally at 20 cm intervals. Data acquired from the CTD and fluorescence probe of the FSS enable it to be precisely positioned at the depth of the highest density gradient or at the chlorophyll a maximum. The FSS made it possible to investigate fine scale vertical distribution of phytoplankton and relationships with water density, nutrient concentrations or light availability, for spring and summer conditions. Under spring conditions, the entire upper layer exhibited a dominant diatom population (Chaetoceros...
Tipo: Text
Palavras-chave: Plankton patchiness; Density discontinuity; Sampling; Thin layer; Nutrients; Phytoplankton.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-533.pdf

Dual-frequency ADCPs measuring turbidity
Provedor de dados: 5
Autores: Jourdin, Frederic; Tessier, Caroline; Le Hir, Pierre; Verney, Romaric; Lunven, Michel; Loyer, Sophie; Lusven, Andre; Filipot, Jean-francois; Lepesqueur, Jeremy.
A pair of self-contained acoustic Doppler current profilers (SC-ADCPs) operating with different frequencies were moored on a muddy sea bottom at about 20 m depth in the Bay of Vilaine off the French Atlantic coast. With their acoustic beams oriented upwards, the SC-ADCPs ensonified most of the water column. The results of several months of in situ recorded echo intensity data spanning 2 years (2003 to 2004) from the dual-frequency ADCPs are presented in this paper. The aim was to estimate suspended particle mass concentration and mean size. A concentration index CI is proposed for the estimation of particle concentration. Based on theory the CI-unlike the volume backscatter strength-does not depend on particle size. Compared with in situ optical data, the...
Tipo: Text
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00213/32427/30896.pdf

Acquisition de données en vidéo sous-marine sur les ulves offshore de la baie de Douarnenez
Provedor de dados: 5
Autores: Lunven, Michel; Le Gall, Erwan; Gaffet, Jean-dominique.
In the Bay of Douarnenez, assessments of the offshore ulva stock have been carried out in 2004 and 2005 using some submarine video techniques. Altogether, 4 campaigns have been conducted during this period of time, enabling an estimate of the ulva biomass lying on the ocean bed, off the tidal zone, at depths of 2 to 20 metres.
Tipo: Text
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/rapport-6325.pdf

Suspended sediments in a macrotidal estuary: comparison and use of different sensors
Provedor de dados: 5
Autores: Lunven, Michel; Gentien, Patrick.
Measurements made using an in situ particle-sizer (PSA) were compared to those of an optical backscatter sensor (OBS) in a macrotidal estuary. Both estimate the total volume of particles. After comparison with dry weight of suspended matter sampled in the study area, the different measurements were converted into dry weight. In three different kinetic energy regimes, times series were coherent for most of the observations. Discrepancies of suspended sediment concentrations estimated by both sensors appeared under specific hydrodynamic conditions: they were related to occurrences of definite particle populations. Overestimations and underestimations of measurements by the instruments depend on the optical principles of the sensors (backscatter and...
Tipo: Text
Palavras-chave: Particle size; Suspended particulate matter; Aggregates; Taille de particule; Matières en suspension; Agrégats.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-521.pdf

Biophysical Interactions Control the Size and Abundance of Large Phytoplankton Chains at the Ushant Tidal Front
Provedor de dados: 5
Autores: Landeira, Jose Maria; Ferron, Bruno; Lunven, Michel; Morin, Pascal; Marie, Louis; Sourisseau, Marc.
Phytoplankton blooms are usually dominated by chain-forming diatom species that can alter food pathways from primary producers to predators by reducing the interactions between intermediate trophic levels. The food-web modifications are determined by the length of the chains; however, the estimation is biased because traditional sampling strategies damage the chains and, therefore, change the phytoplankton size structure. Sedimentological studies around oceanic fronts have shown high concentrations of giant diatom mats (&gt;1 cm in length), suggesting that the size of diatom chains is underestimated in the pelagic realm. Here, we investigate the variability in size and abundance of phytoplankton chains at the Ushant tidal front (NW France) using the Video...
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00186/29730/28148.pdf

Surveillance écologique et halieutique du site de Flamanville. Année 1997
Provedor de dados: 5
Autores: Dreves, Luc; Erard-le Denn, Evelyne; Lunven, Michel; Martin, Jocelyne; Miossec, Dominique; Quintin, Jean-yves.
Monitoring n°l5 of the FLAMANVILLE nuclear power plant takes into account studies conducted between March and September 1997. Impacts on hydrology, microbiology, phytoplankton, zooplankton, fisheries, intertidal phytobenthos and zoobenthos are reported This power plant has been in operation for twelve years. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Pelagos; Fisheries; Benthos; Nuclear power plant; Monitoring; Flamanville; Pelagos; Halieutique; Benthos; Surveillance; Flamanville; Centrale nucléaire.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/rapport-6875.pdf

Surveillance écologique et halieutique du site électronucléaire de Flamanville. Année 2000
Provedor de dados: 5
Autores: Dreves, Luc; Erard-le Denn, Evelyne; Gaffet, Jean-dominique; De Kergariou, Gabriel; Lunven, Michel; Martin, Jocelyne; Miossec, Dominique; Rumebe, Myriam.
Monitoring n°18 of the Flamanville nuclear power plant takes into account studies conducted between March and September 2000. Impacts on hydrology, microbiology phytoplankton, zooplankton, fisheries, intertidal phytobenthos and zoobenthos are reported. This power plant has been in operation for fifteen years. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Pelagos; Fisheries; Benthos; Nuclear power plant; Monitoring; Flamanville; Pelagos; Halieutique; Benthos; Surveillance; Flamanville; Centrale nucléaire.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/rapport-6878.pdf

Développement d'un drone nautique pour le prélèvement d'échantillons d'eau en milieu côtier et estuarien (SPEEdoo)
Provedor de dados: 5
Autores: Daniel, Anne; Rousseaux, Patrick; Le Gall, Erwan; Perchoc, Jonathan; Lunven, Michel.
A nautical drone was designed for the monitoring of estuarine and coastal waters in the context of the Water Framework Directive (WFD) to :  - go up to 500 m off the coastline in less than 5 minutes,  - perform in situ measurements (temperature, salinity, turbidity),  - collect water samples for later analysis in the laboratory (phytoplankton identification, chlorophyll, nutrients, ...).
Tipo: Text
Palavras-chave: Nautical drone; Water sampling; Coastal and estuarine waters.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00350/46094/45786.pdf

Surveillance écologique et halieutique du site électronucléaire de Flamanville. Année 1999
Provedor de dados: 5
Autores: Dreves, Luc; Erard-le Denn, Evelyne; Gaffet, Jean-dominique; Lunven, Michel; Martin, Jocelyne; Miossec, Dominique; Quintin, Jean-yves.
Monitoring n°17 of the Flamanville nuclear power plant takes into account studies conducted between March and September 1999. Impacts on hydrology, microbiology, phytoplankton, zooplankton, fisheries, intertidal phytobenthos and zoobenthos are reported. This power plant has been in operation for fourteen years. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Pelagos; Fisheries; Benthos; Nuclear power plant; Monitoring; Flamanville; Pelagos; Halieutique; Benthos; Surveillance; Flamanville; Centrale nucléaire.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/rapport-6877.pdf

In situ video and diffraction analysis of marine particles
Provedor de dados: 5
Autores: Lunven, Michel; Gentien, Patrick; Kononen, K; Le Gall, Erwan; Danielou, Marie-madeleine.
A design for a new underwater video-system to detect and observe suspended particles is presented. Particles are collected and isolated in a rectangular box where they are highly illuminated by a white light plane. The total field of view is determined. The camera, equipped with a remote controlled zoom, can resolve particles sizes ranging from 25 mum to several millimetres. Real-time image analyses are therefore performed. Particle counts and size spectra are calculated and displayed. Total light intensity scattered by the illuminated particles is closely related to the back-scattering values determined by an optical back-scatter sensor. A particle size analyser using diffraction analysis is associated to this video-system on a custom profiler....
Tipo: Text
Palavras-chave: Image analysis; Fine scale distribution; Flocculation; Suspended matter; In situ measurement.
Ano: 2003
URL: https://archimer.ifremer.fr/doc/2003/publication-504.pdf

Surveillance écologique et halieutique du site de Flamanville. Année 1994
Provedor de dados: 5
Autores: Dreves, Luc; Quintin, Jean-yves; Erard-le Denn, Evelyne; Lunven, Michel; Martin, Jocelyne; Miossec, Dominique.
Monitoring n°12 of the FLAMANVILLE nuclear power plant takes into account studies conducted between March and September 1994. Hydrology microbiology, phytoplankton, zooplankton, intertidal phytobenthos and zoobenthos, and fishing are reported. 1994 is the ninth year of operation for this power plant. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Surveillance; Pelagos; Halieutique; Centrale nucléaire; Benthos; Monitoring; Power plant; Pelagos; Fishing; Benthos.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/1995/rapport-6826.pdf

Hydrologie et populations phytoplanctoniques dans le panache de la Loire et en Baie de Vilaine en période estivale : résultats de la campagne VILOIR.
Provedor de dados: 5
Autores: Lunven, Michel; Guillaud, Jean-francois; Crassous, Marie Pierre; Youenou, Agnes; Gohin, Francis; Huret, Martin; Danielou, Marie-madeleine; Kerouel, Roger; Labry, Claire; Aminot, Alain.
Inscrite dans le cadre du Grand Défi Golfe de Gascogne, la campagne VILOIR a été réalisée du 19 au 26 Juin 2003 à bord du Côtes de la Manche avec pour objectif l’étude en période estivale des structures hydrologiques et phytoplanctoniques des panaches de la Loire et de la Vilaine. Elle fait suite, sur la même thématique, à la campagne hivernale NUTRIGAS (2001) et à la campagne printanière GASPROD (2002).
Tipo: Text
Palavras-chave: Surveillance; Littoral; Phytoplancton; Phycotoxines; Bretagne; Pays de Loire.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/00144/25494/23648.pdf

Intercomparaison LISST100X-CILAS à partir de cellules phytoplanctoniques
Provedor de dados: 5
Autores: Verney, Romaric; Lunven, Michel.
Tipo: Text
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00067/17820/15348.pdf

Methode de cartographie quantitative des ulves "offshore"
Provedor de dados: 5
Autores: Merceron, Michel; Lunven, Michel.
Recent studies in the bays of Douarnenez and La Forêt-Fouesnant have proved that drifting stocks of « offshore » ulva exist between -2 and -20 meters depth. These stocks are nearly as important in weight as those located in the tidal zone, the only ones which are generally studied. It is likely that such « offshore » stocks also exist elsewhere in Brittany. The sampling method by discrete stations visited by divers, which has been used till now, is considered heavy and not precise enough. The new method involves a film camera set on a fish towed at a speed of a few knots. The fish is kept above the sea bottom at a chosen altitude controlled by a guiderope. The system is sturdy, autonomous, and can be easily transferred from one boat to another. The...
Tipo: Text
Palavras-chave: Brittany; Cartography; Imagery; Method; Offshore ulva; Eutrophication; Bretagne; Cartographie; Imagerie; Méthode; Ulve offshore; Eutrophisation.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/rapport-1579.pdf

A surface plasmon resonance system for the underwater detection of domoic acid
Provedor de dados: 5
Autores: Colas, Florent; Crassous, Marie-pierre; Laurent, Sebastien; Litaker, Richard W.; Rinnert, Emmanuel; Le Gall, Erwan; Lunven, Michel; Delauney, Laurent; Compère, Chantal.
Over the past decade Surface Plasmon Resonance (SPR) techniques have been applied to the measurement of numerous analytes. In this article, an SPR biosensor system deployed from an oceanographic vessel was used to measure dissolved domoic acid (DA), a common and harmful phycotoxin produced by certain microalgae species belonging to the genus Pseudo-nitzschia. During the biosensor deployment, concentrations of Pseudo-nitzschia cells were very low over the study area and measured DA concentrations were below detection. However, the in situ operational detection limit of the system was established using calibrated seawater solutions spiked with DA. The system could detect the toxin at concentrations as low as 0.1 ng mL−1 and presented a linear dynamic range...
Tipo: Text
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00324/43481/42921.pdf

Satellite-derived parameters for biological modelling in coastal waters: Illustration over the eastern continental shelf of the Bay of Biscay
Provedor de dados: 5
Autores: Gohin, Francis; Loyer, S; Lunven, Michel; Labry, Claire; Froidefond, J; Delmas, Daniel; Huret, Martin; Herbland, Alain.
In biological modelling of the coastal phytoplankton dynamics, the light attenuation coefficient is often expressed as a function of the concentrations of chlorophyll and mineral suspended particulate matter (SPM). In order to estimate the relationship between these parameters over the continental shelf of the northern Bay of Biscay, a set of in situ data has been gathered for the period 1998-2003 when SeaWiFS imagery is available. These data comprise surface measurements of the concentrations of total SPM, chlorophyll, and irradiance profiles from which is derived the attenuation coefficient of the photosynthetically available radiation, K-PAR. The performance of the IFREMER look-up table used to retrieve the chlorophyll concentration from the SeaWiFS...
Tipo: Text
Palavras-chave: Bay of Biscay; SeaWiFS; Sediment; Chlorophyll; Ocean color.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-1172.pdf

Surveillance écologique et halieutique du site de Flamanville. Année 1993
Provedor de dados: 5
Autores: Dreves, Luc; Erard-le Denn, Evelyne; Lunven, Michel; Martin, Jocelyne; Miossec, Dominique; Piriou, Jean-yves; Quintin, Jean-yves.
Surveillance n° 11 of FLAMANVILLE power plant takes in account studies between march 1993 and september 1993. Hydrology, microbiology, phytoplankton, zooplankton, intertidal phytobenthos et zoobenthos, and fishing are studied. The year 1993 is the eighth year of working for this power plant. (NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Monitoring; Power plant; Pelagos; Fishing; Benthos; Surveillance; Pelagos; Halieutique; Centrale nucléaire; Benthos.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/1994/rapport-6825.pdf

Surveillance écologique et halieutique du site de Flamanville. Année 1995
Provedor de dados: 5
Autores: Dreves, Luc; Martin, Jocelyne; Erard-le Denn, Evelyne; Lunven, Michel; Miossec, Dominique; Quintin, Jean-yves.
Monitoring n°13 of the FLAMANVILLE nuclear power plant takes into account studies conducted between March and September 1995. Hydrology microbiology, phytoplankto~ zooplankto~ f1shing, intertidal phytobenthos and zoobenthos are reported. This power plant is in operation for ten years. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Monitoring; Power plant; Pelagos; Fishing; Benthos; Surveillance; Pelagos; Halieutique; Centrale nucléaire; Benthos.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/1996/rapport-6827.pdf

Développement de l'aquaculture à Saint-Pierre et Miquelon : le cas d'étude de la pectiniculture - approche et méthodologies
Provedor de dados: 5
Autores: Goraguer, Herle; Goulletquer, Philippe; Caisey, Xavier; Lazure, Pascal; Lajournade, M.; Lunven, Michel; Robert, Stephane; Rodriguez, Julien.
Tipo: Text
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00063/17413/14920.pdf

Surveillance écologique et halieutique du site électronucléaire de Flamanville. Année 1998
Provedor de dados: 5
Autores: Dreves, Luc; Erard-le Denn, Evelyne; Lunven, Michel; Martin, Jocelyne; Miossec, Dominique; Quintin, Jean-yves.
Monitoring n°16 of the Flamanville nuclear power plant takes into account studies conducted between March and September 1998. Impacts on hydrology, microbiology, phytoplankton, zooplankton, fisheries, intertidal phytobenthos and zoobenthos are reported. This power plant has been in operation for thirteen years. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Pelagos; Fisheries; Benthos; Nuclear power plant; Monitoring; Flamanville; Pelagos; Halieutique; Benthos; Surveillance; Flamanville; Centrale nucléaire.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/rapport-6876.pdf

Scales characterising a high density thin layer of Dinophysis acuta Ehrenberg and its transport within a coastal jet
Provedor de dados: 5
Autores: Farrell, Hazel; Gentien, Patrick; Fernand, Liam; Lunven, Michel; Reguera, Beatriz; Gonzalez-gil, Sonsoles; Raine, Robin.
An investigation into the distribution of Dinophysis spp. in coastal waters off the south coast of Ireland was carried out in July 2007. Dinophysis acuta was present as a sub surface layer containing up to 55,000 cells L-1. The population had a high percentage of viable cells (mean: 89%; median: 94%; n = 24) with a high specific division rate (~0.55 d-1). The layer, of approximately 5 m thickness, did not coincide with the fluorescence maximum and was present as a patch of horizontal dimension less than 10 km x 7 km. Both conventional and towed undulating CTD used in conjunction with high vertical resolution sampling methods showed the patch of Dinophysis to move with a similar speed and direction as the coastal flow, which ran parallel to the coast in the...
Tipo: Text
Palavras-chave: Coastal jets; Dinophysis; Ireland; Transport.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00064/17538/17420.pdf

Surveillance écologique et halieutique du site de Flamanville. Année 1996
Provedor de dados: 5
Autores: Dreves, Luc; Erard-le Denn, Evelyne; Lunven, Michel; Martin, Jocelyne; Miossec, Dominique; Quintin, Jean-yves.
Monitoring n°14 of the FLAMANVILLE nuclear power plant takes into account studies conducted between March and September 1996. Impacts on hydrology, microbiology, phytoplankton, zooplankton, fisheries, intertidal phytobenthos and zoobenthos are reported. This power plant has been in operation for eleven years.
Tipo: Text
Palavras-chave: Centrale nucléaire; Flamanville; Surveillance; Benthos; Halieutique; Pelagos; Flamanville; Monitoring; Nuclear power plant; Benthos; Fisheries; Pelagos.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00005/11658/8317.pdf

Rapport d'intervention sur l'épave du chimiquier ECE
Provedor de dados: 5
Autores: Lunven, Michel.
This intervention is in line with the monitoring study which followed the shipwreck of the chemical tanker ECE 40 miles west of the Cap de la Hague. It aims to carry out some targeted samplings (in deep water, away from the shipwreck) in order to spot and quantify a possible chemical pollution linked to phosphoric acid leaking out of the ship's tanks.
Tipo: Text
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/rapport-6324.pdf

Tidal and wind-event variability and the distribution of two groups of Pseudo-nitzschia species in an upwelling-influenced ría
Provedor de dados: 5
Autores: Diaz, Patricio A.; Ruiz-villarreal, Manuel; Velo-suarez, Lourdes; Ramilo, Isabel; Gentien, Patrick; Lunven, Michel; Fernand, Liam; Raine, Robin; Reguera, Beatriz.
High-resolution physical and biological measurements were carried out in May-June 2007 during the ‘HABIT-Pontevedra 2007' survey in Ría de Pontevedra (Galician Rías Baixas, NW Spain) to study small-scale physical-biological interactions in the distribution of microphytoplankton, with special emphasis on harmful species. Longitudinal transects from the Ría to the adjacent shelf were sampled to describe the spring-neap tidal and circadian variability. An in situ particle profiler, a moored ADCP, and a towed undulating CTD (Scanfish) were used during the survey, which took place after an upwelling pulse at neap tides during a downwelling–upwelling cycle and coincided with the annual maximum of Pseudo-nitzschia spp. Cell maxima of P. seriata (2×106 cells L−1)...
Tipo: Text
Palavras-chave: Pseudo-nitzschia spp.; Upwelling-downwelling cycle; Spring-neap tidal variability; Thin layers; Circadian variability; Galician Rias.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00157/26794/24897.pdf

Integrated understanding of initial conditions of early life stages using integrated ecosystem survey data
Provedor de dados: 5
Autores: Petitgas, Pierre; Huret, Martin; Doray, Mathieu; Bourriau, Paul; Lunven, Michel.
Since 2000, the yearly acoustic pelagic survey of Ifremer in the Bay of Biscay designed for fish stock assessment of small pelagic fish has been converted into an integrated pelagic ecosystem monitoring plateforme. This has been achieved by coupling sensors and automating data acquisition streams. The data series now spans from 2000 to 2014. Together with data sensors and sampling designs, we present here an integrated study allowing to understand the spawning process of anchovy. We compare the maps of anchovy eggs obtained with CUFES (continuous underway fish egg sampler) with that of their spawning adults sampled at the same time by acoustics and identification trawl hauls. The distributions of eggs are surprisingly different than that of adults, with in...
Tipo: Text
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00281/39177/37738.pdf

Monitoring of sea scallops Placopecten magellanicus in bottom seeding trials using video in Miquelon bay, Saint Pierre et Miquelon, France
Provedor de dados: 5
Autores: Robert, Stephane; Le Moine, Olivier; Lunven, Michel; Caisey, Xavier; Gaffet, Jean-dominique; Le Gall, Erwan; Vasquez, Mickael; Rodriguez, Julien; Detcheverry, Sebastien; Goulletquer, Philippe.
Placopecten magellanicus production in Saint Pierre et Miquelon (NW North Atlantic) has been developed through direct seeding of juveniles on leased areas. However, most of the culture occurs in deep water ranging from 30 to 70 meters, which requires a monitoring by video to facilitate the grow-out and survival evaluation. In August 2008, a submersible leaded structure was connected by a video cable to the surface and observation screen was defined through the video, an altimeter and two lasers. The pictures were recorded on board on hard drive and digital video recorder DVCAM, and data were georeferenced by VIDEONAV software. Analysing the video tapes allows to establish a thematic database on the ground structure, presence or absence of seeded and wild...
Tipo: Text
Palavras-chave: Scallops; Placopecten magellanicus; GIS; Monitoring; Miquelon Bay.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00134/24544/22576.pdf

Vertical and horizontal controls of a haptophyte thin layer in the Bay of Biscay, France
Provedor de dados: 5
Autores: Farrell, Hazel; Gentien, Patrick; Fernand, Liam; Lazure, Pascal; Lunven, Michel; Youenou, Agnes; Reguera, Beatriz; Raine, Robin.
Investigations into the phytoplankton of the Bay of Biscay in July 2006 revealed an extensive bloom of an unidentified haptophyte species. High-resolution sampling techniques identified the region in the vicinity of the mouth of the Loire estuary as an area of high (106–107 cells l−1) cell densities of the haptophyte in a thin sub-surface layer. This organism dominated the phytoplankton population regionally. Measurements of the vertical distribution of horizontal shear showed that the population, located at ca. 20 m depth, was confined to a layer lying between two density discontinuities with high shear. Physical measurements indicated that the population was being advected southeastwards, along the coast. Seaward spreading of the population was also...
Tipo: Text
Palavras-chave: Haptophyte; Bay of Biscay; Horizontal dispersal; Thin layers.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00160/27129/25327.pdf

Méthode de cartographie quantitative des fonds marins par vidéo. Application au suivi des semis de Placopecten magellinacus en Rade de Miquelon.
Provedor de dados: 5
Autores: Lunven, Michel; Robert, Stephane; Caisey, Xavier; Rodriguez, Julien; Detcheverry, Sebastien; Gaffet, Jean-dominique; Le Gall, Erwan; Vasquez, Mickael.
Ce poster présente une méthodologie d’investigation des fonds marin par vidéo sous marine. Le système est constitué d’un bâti intégrant une caméra, un projecteur, un altimètre ainsi que des pointeurs laser. Les images vidéo des fonds marins sont retransmises et enregistrées à bord du navire sur disque dur et magnétoscope numérique DVCAM.  Lors des profils vidéo, le logiciel de gestion VIDEONAV permet de constituer un fichier de navigation intégrant les positions géographiques, le code temps du magnétoscope ainsi que la surface visualisée calculée à partir de la hauteur de prise de vue par rapport au fond. En temps différé, VIDEONAV permet le rejeu de la navigation et des bandes vidéo associées dans le but de compléter ou de générer des fichiers de...
Tipo: Text
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00144/25516/23656.pdf

Motility and autotoxicity in Karenia mikimotoi (Dinophyceae)
Provedor de dados: 5
Autores: Gentien, Patrick; Lunven, Michel; Lazure, Pascal; Youenou, Agnes; Crassous, Marie-pierre.
Karenia mikimotoi is one of the most common red-tide dinoflagellates proliferating in the eastern North Atlantic and around Japan. Kills of marine fauna are associated with its blooms. In mixed water columns it migrates vertically, while in stratified water columns, the population remains confined within pycnocline layers. Wind events, increasing mixing and agitation initiate declines in its populations. This paper is focused on the formulation of mortality rate relative to shear rate. Autotoxicity is demonstrated by the use of a synthetic toxin. Bioconvection observed in cultures allows the establishment of a trade-off between phototropism, which leads to the local accumulation of cells, and their autotoxicity, which would prevent cell concentration. The...
Tipo: Text
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2436.pdf

The ZooCAM, a new in-flow imaging system for fast onboard counting, sizing and classification of fish eggs and metazooplankton
Provedor de dados: 5
Autores: Colas, Florent; Tardivel, Morgan; Perchoc, Jonathan; Lunven, Michel; Forest, Bertrand; Guyader, Gerard; Danielou, Marie-madeleine; Le Mestre, Sophie; Bourriau, Paul; Antajan, Elvire; Sourisseau, Marc; Huret, Martin; Petitgas, Pierre; Romagnan, Jean-baptiste.
In this paper we present the ZooCAM, a system designed to digitize and analyse on board large volume samples of preserved and living metazooplankton (i.e. multicellular zooplankton) and fish eggs &gt; 300 µm ESD. The ZooCAM has been specifically designed to overcome the difficulties to analyse zooplankton and fish eggs in the framework of the PELGAS survey, and provide high frequency data. The ZooCAM fish eggs counts were comparable to those done with a dissecting microscope. The ZooCAM enabled the accurate prediction and fast on board validation of staged anchovy and sardine eggs in almost real time after collection. A comparison with the ZooScan, on a more complex zooplanktonic community, provided encouraging results on the agreement between the 2...
Tipo: Text
Palavras-chave: ZooCAM; In-flow imaging; Fish eggs; Zooplankton; Ecosystemic survey.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00407/51833/52432.pdf

Etude de la croissances des moules sur tois sites de centrales nucléaires. Gravelines - Penly - Plogoff
Provedor de dados: 5
Autores: Dewamurez, J.m.; Lunven, Michel; Toularastel, France.
Dans le cadre de son programme d'équipement nucléaire, Electricité de France a confié au Centre National pour l'Exploitation des Océans la réalisation d'une étude de deux ans sur la croissance des moules. Le but du contrat était de mieux connaitre les modalités de la croissance de ces mollusques en fonction de la qualité du milieu où ils vivent. Les sites concernés par cette étude sont Gravelines, Penly, Plogoff. L'étude sur le site de Gravelines est effectuée à Wimereux par J.M. DEWAMUREZ, celle sur les sites de Plogoff et Penly à Brest (au COB) par M. LUNVEN et F. TOULARASTEL. Bien que répondant à la même question, les deux parties de l'étude sont traitées un peu différemment quant aux méthodes envisagées, elles sont réunies dans le présent rapport tout...
Tipo: Text
Ano: 1984
URL: http://archimer.ifremer.fr/doc/00105/21605/19185.pdf

Vertical distribution of phytoplankton communities and relationships with physico-chemical parameters resolved by a fine scale sampler
Provedor de dados: 5
Autores: Lunven, Michel; Guillaud, Jean-francois; Youenou, Agnes; Crassous, Marie-pierre; Berric, Roger; Le Gall, Erwan; Kerouel, Roger; Labry, Claire; Aminot, Alain.
Many studies in coastal areas have shown the existence of thin chemical and biological layers. Their thickness and vertical extension are mainly controlled by hydrological and physical forcing. An accurate description of the phytoplankton communities growing within these layers is difficult to obtain without a well-adapted sampling system. A new Fine Scale Sampler (FSS) has been designed in Ifremer in order to study phytoplankton distribution and associated dissolved properties in high stratified water column. This FSS consists in a vertical array of 15 sampling bottles, horizontally laid with 20 cm intervals. Data acquired from a CTD and Fluorescence probe provide a precise FSS positioning at the depth of highest density gradient or at chlorophyll a...
Tipo: Text
Palavras-chave: Surveillance; Littoral; Phytoplancton; Phycotoxine.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/00144/25493/23647.pdf

Seasonal variation of riverine nutrient inputs in the northern Bay of Biscay (France), and patterns of marine phytoplankton response
Provedor de dados: 5
Autores: Guillaud, Jean-francois; Aminot, Alain; Delmas, Daniel; Gohin, Francis; Lunven, Michel; Labry, Claire; Herbland, Alain.
Seasonal variations in nutrient inputs are described for the main rivers (Loire and Vilaine) flowing into the northern Bay of Biscay. The river plumes are high in N/P ratio in late winter and spring, but not in the inner plume during the summer. Conservative behavior results in most nutrients entering the estuary and eventually reaching the coastal zone. Temporal and spatial aspects of phytoplankton growth and nutrient uptake in the northern Bay of Biscay distinguish the central area of salinity 34 from the plume area. The first diatom bloom appears offshore in late winter, at the edge of the river plumes, taking advantage of haline stratification and anticyclonic "weather windows." In spring, when the central area of the northern shelf is...
Tipo: Text
Palavras-chave: Northern Bay of Biscay; Phytoplankton; Continental shelf; Riverine inputs; Nutrients.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2007/publication-2354.pdf

Use of SeaWiFS data for light availability and parameter estimation of a phytoplankton production model of the Bay of Biscay
Provedor de dados: 5
Autores: Huret, Martin; Gohin, Francis; Delmas, Daniel; Lunven, Michel; Garcon, Véronique.
Processing SeaWiFS (Sea-viewing Wide Field-of-view Sensor) data provides useful information for the observation and modelling of the phytoplankton production of the Bay of Biscay. Empirical algorithms allow the retrieval of chlorophyll a and non-living Suspended Particulate Matter (SPM) concentrations. These data are used to constrain a coupled 3D physical-biogeochemical model of the Bay of Biscay continental shelf Two issues are investigated, depending on the variable used, to constrain the winter to spring phytoplankton production for the year 2001. First, SPM data is used as forcing data to correct the corresponding state variable of our model. This allows the realistic simulation of the light limited bloom at the end of February 2001, as observed with...
Tipo: Text
Palavras-chave: Bay of Biscay; SeaWiFS; Parameter estimation; Chlorophyll; Suspended Particulate Matter; Physical biogeochemical modelling.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2493.pdf

Acquisition de données sur l'expansion de Caulerpa taxifolia et Caulerpa racemosa en rade d'Hyères et en rade de Toulon (France)
Provedor de dados: 5
Autores: Belsher, Thomas; Lunven, Michel; Le Gall, Erwan; Caisey, Xavier; Dugornay, Olivier; Mingant, Christian.
The oceanographic cruise Califa 2000, as the previous cruise, which concerned the "Parc National de Port-Cros", had for its principal objective to furnish some elements susceptible to help in the control of Caulerpa taxifolia expansion and in the protection of particularly sensitive areas (national parks, patrimonial sectors, regions of socio-economic importance). The cruise lasted from the 4th to the 21st of September 2000 in the rade d'Hyeres, Porquerolles island included, and the rade of Toulon. This detailed prospection gives a location of C. taxifolia and C. racemosa, a new invasive seaweed. (C) 2003 Editions scientifiques et medicales Elsevier SAS. All rights reserved.
Tipo: Text
Palavras-chave: Rade de Toulon; Rade d' Hyeres; Cartography; Caulerpa racemos; Caulerpa taxifolia; Invasive species; Rade de Toulon; Rade d'Hyères; Cartographie; Caulerpa racemosa; Caulerpa taxifolia; Espèces invasives.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/publication-520.pdf

A new device for in situ video and fluorescence analysis of marine particles. Applications to phytoplankton studies.
Provedor de dados: 5
Autores: 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