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Registros recuperados: 3
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Détection et étude de la stabilité de l'ADN de virus de type herpès infectant les huîtres dans des échantillons d'eau ArchiMer
Vigneron, Vassilia.
Depuis 1991, des mortalités massives associées à des infections à herpès virus sont rapportées chez des larves et des juvéniles de différentes espèces de bivalves dans différentes régions du globe. Les études ont porté essentiellement sur la mise en évidence de la présence de ce type de virus chez les coquillages d'intérêt économique. Actuellement, l'intérêt se porte sur la persistance du virus dans le milieu marin, et cela dans le but de déterminer si le milieu constitue ou non un moyen de contamination des animaux. Le travail a constitué en une étude sur la persistance de la détection de l'ADN d'herpès virus (OsHV-1) afin de mieux appréhender les modes de dissémination et de transmission du virus. Dans un premier temps, la stabilité de l'ADN purifié et...
Tipo: Text Palavras-chave: Herpèsvirus; Eau de mer; Détection; PCR; Persistance; Stabilité.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00032/14350/11634.pdf
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Modèles autorégressifs à changements de régimes markoviens. Applications aux séries tempo-relles de vent ArchiMer
Ailliot, Pierre.
In this thesis, several original Markov switching autoregressive model are proposed for wind time series. The first chapter is devoted to a theoretical study of these models. We focus mainly on the problems of the numerical calculation of the maximum likelihood estimators, of the asymp-totic behavior of these estimators and finally of model selection and validation. In the second chapter, we propose various Markov switching autoregressive model to describe the evolution of the wind in a fixed point, and then in the third chapter its space-time evolution. For each suggested model, we check the physical interpretability of the various parameters, and their capacity to simulate realistic artificial sequences. The obtained results are compared to those...
Tipo: Text Palavras-chave: Space time model; Wind time series; Asymptotic properties; Maximum likelihood estimator; Stability; Markov Switching autoregressive model; Modèle spatio temporel; Séries temporelles de vent; Propriétés asymptotiques; Estimateurs du maximum de vraisemblance; Stabilité; Modèles autorégressifs à changements de régimes markoviens.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/these-325.pdf
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Stability of spatial structures of demersal assemblages: a multitable approach ArchiMer
Gaertner, Jean-claude; Chessel, Daniel; Bertrand, Jacques.
The present work is based on a set of bottom trawl surveys performed in the Gulf of Lions between 1983 and 1992. A new method which couples the STATIS multitable approach with the logic of correspondence analysis (CoA) is proposed to study the stability of spatial organization of demersal assemblages in terms of species composition. This CoA version of STATIS has provided a clear representation of the stable part of the spatial structure of the assemblages. In addition, it gave an insight into the interannual variations of the distribution of each population around the reference structure. Our results showed that the demersal assemblages of the Gulf of Lions exhibited strong spatial structuring, mainly orientated along a bathymetric gradient. This gradient...
Tipo: Text Palavras-chave: Assemblage de poissons; Chalutage; Analyse multitableaux; Méditerranée; Stabilité; Structure spatiale; Fish assemblage; Trawl surveys; Multitable analysis; Correspondence analysis; Mediterranean sea; Stability; Spatial structure.
Ano: 1998 URL: https://archimer.ifremer.fr/doc/1998/publication-875.pdf
Registros recuperados: 3
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