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Registros recuperados: 24 | |
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Casas, Stellio. |
Monitoring coastal contamination of trace metals using bivalve molluscs as quantitative bioindicators is widely used in many international monitoring programs. The bioaccumulation of metal within an organism results from the interaction between physiological (growth, loss of weight, absorption, accumulation), chemical (metal concentration, speciation, bioavailability) and environmental factors (temperature, SPM, chlorophyll). By utilizing the parameters above in this study, it appears that modeling metal dynamics in marine mussels is a reliable tool. The model allows understanding the bioaccumulation process which results from the interactions between biological, chemical and environmental factors. One of the objective of this study was to couple a... |
Tipo: Text |
Palavras-chave: Biomonitoring; Dynamic Energy Budget; Model; Trace metals; Bioaccumulation; Mytilus galloprovincialis; Mussel; Bioindicator; Surveillance; Budget énergétique dynamique; Modèle; Métaux traces; Bioaccumulation; Mytilus galloprovincialis; Moule; Bioindicateur. |
Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/these-356.pdf |
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Chapelle, Annie; Mesnage, Valérie; Mazouni, Nabila; Deslous-paoli, Jean-marc; Picot, Bernadette. |
A simulation of nitrogen and phosphorus exchanges for the sediment-water interface is presented, The aim of the sttudy is to understand the dynamic behaviour of an eutrophie coastal lagoon (Thau, France), ln situ experiments were performed to estimate the different pools of nitrogen and phosphorus in the water column and in the sediment. The diffusive fluxes between them were also estimated. A numerical mode1, simulating nitrogen and phosphorus cycles, was developed and calibrated with data recorded .at two seasons (winter and summer). This study leads to the conclusion that is necessary to know the different pools of nitrogen and phosphorus in order to estimate which fraction is bioavailable and the rate of nutrient exchange between sediment and water. It... |
Tipo: Text |
Palavras-chave: Modèle; Phosphore; Azote; Sédiment; Ecosystème conchylicole; Modelling; Phosphorus; Nitrogen; Sediment; Shellfish ecosystem. |
Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00039/15026/12360.pdf |
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Gangnery, Aline. |
In Thau Iagoon (Mediterranean Sea), shellfish are cultured in suspension. Molluscs are reared on ropes that are suspended on frames. Principal species concerned by breeding are Crassostrea gigas, Mytilus galloprovincialis and, in a less extent, Ostrea edulis. A new sampling method was developped to assess the total stock of cultured shellfish and was tested in July 1998 and April 1999. The total stock was found to be 19500 tons (± 1120 SE) in 1998 and 14100 tons (± 830 SE) in 1999, thus exhibiting temporal variations. Temporal differences in the total stock are mainly attributable to the breeding cycle but also to sorne exceptionnal events which occurred in Thau lageon in 1997 and 1998 (water anoxia, bacteriological crisis, bloom of toxic algae). In the... |
Tipo: Text |
Palavras-chave: Etang de Thau; Bivalves; Echantillonnage; Dynamique; Modèle; Epibiontes. |
Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00443/55478/57008.pdf |
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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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Millet, B. |
The wind-driven flow in the closed bassin de Thau is reproduced with a two-dimensional numerical model of horizontal ciruclation using an Alternate Direction Implicit scheme. A stochastic analysis of frequencies on a yearly time scale of the velocity fields computed in the model and a spatial and stochastic treatment of the term (H2 y2), similar to an effective coefficient of horizontal dispersion by shear effect are presented. This approach will allow the delineation, in a stochastic manner, of the main structures of the circulation in the lagoon and the spatial heterogeneity of its ecohydrodynamic features. Two attempts of analogical research are presented, with sorne examples of the spatial structure in the phytoplankton biomass and the map of the... |
Tipo: Text |
Palavras-chave: Lagune; Modèle; Circulation; Dispersion; Sédiment; Lagoon; Model; Circulation; Dispersion; Sediment. |
Ano: 1989 |
URL: http://archimer.ifremer.fr/doc/00323/43399/43093.pdf |
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Mourton, Chantal. |
Oyster culture is, at a world scale, hit by variious epizooties, which are maintly caused by protozoans of the Phylum Ascetospora. Among them, Bonamia ostreae consitutes an appreciated model in order to study, at the cell scale, host-parasite relationships, as well as the immune role of hemocytes. Indeed, this parasite, which reproduces in hemocytes of Ostrea edulis, but cannot develop in Crassostea gigas. This development of an in vitro model for hemocyte-Bonamia relationships is presented. This includes the development and implementation of various techniques : making primocultures, protocol for infection with purified parasites, histological and immunoenzymatic analyses of infection. Such model allowed to study the interaction between host and... |
Tipo: Text |
Palavras-chave: Modèle; Histologie; Méthodologie; Primoculture; Ostrea edulis; Parasite; Hémocytes; Bonamia ostreae; Ascetospora; Protozoaire; Epizootie. |
Ano: 1987 |
URL: http://archimer.ifremer.fr/doc/1987/rapport-3234.pdf |
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Muller-feuga, Arnaud. |
After a literature overview of growth models applied to intensively cultured fishes, a new one is proposed for assistance in rearing operations, with following characteristics. A simple and integratable mathematic expression simulates growth while eliminating individual weight influence. It gives way to a specific growth general definition. Temperature action mode on growth speed is simulated by substraction of two exponential functions. An automatic calculation method of thermal parameters is proposed. The torpid action of low temperatures is considered. Feeding ration influences growth through simple rules which are explicitly taken in account by mean of a two parameters function. The other growth factors, more difficult to seize, are expressed through a... |
Tipo: Text |
Palavras-chave: Modèle; Croissance; Élevage poissons; Pisciculture; Model; Fish culture.; Growth. |
Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00183/29428/27794.pdf |
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Sargian, Peggy; Laroche, Sophie; Bouchoucha, Marc; Andral, Bruno. |
Sur la base de l'expérience acquise dans le cadre du programme Rinbio, développé en partenariat avec l'Agence de l'Eau Rhône Méditerranée Corse depuis 1996, sept campagnes ont été réalisées sur l'ensemble de la Méditerranée : Mytilos en 2004, 2005 et 2006, Mytimed en 2007, Mytiad en 2008, Mytior en 2009 et Mytiturk en 2011. La reproductibilité de la technique du caging de moules au cours de ces différentes campagnes permet de disposer d'une première cartographie de la contamination chimique à l'échelle de l'ensemble du littoral méditerranéen. Les caractéristiques du capteur représenté par les moules varient cependant en fonction du milieu et en particulier de ses capacités trophiques, des périodes de stabulation et des lots initiaux d'échantillons, ce qui... |
Tipo: Text |
Palavras-chave: Rinbio; Méditerranée; Mytilos; Mytimed; Contaminant chimique; Modèle; Moules; Traitement statistique.. |
Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00233/34387/32781.pdf |
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Soletchnik, Patrick; Faury, Nicole; Razet, Daniel; Geairon, Philippe; Goulletquer, Philippe. |
L'objectif des expérimentations 1996 a consisté à comparer en "instantané" le potentiel de croissance de C. gigas à différents stades de maturité sexuelle, selon une méthodologie ayant déjà fait ses preuves en laboratoire. En accord avec les résultats de 1995, on retrouve une fragilité de C. gigas autour de la période de ponte. En 1996, les principales fonctions physiologiques (respiration, filtration et absorption) sont étudiées sur deux cohortes et pour 4 stades de maturité sexuelle. La "fragilité physiologique" des huîtres porte sur le stade de maturation avancée pour la cohorte 1993 et sur le stade de post-ponte pour la cohorte 1994. La méthodologie de conditionnement a été confirmée par ces expérimentations. Cependant on doit à nouveau noter les... |
Tipo: Text |
Palavras-chave: Crassostrea gigas; Mortalité; Ecophysiologie; Modèle; Marennes Oléron. |
Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00072/18362/15934.pdf |
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Registros recuperados: 24 | |
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