Consulta: subjectFacets:"Symbiose"
Registros recuperados: 4
Data/hora: 09/06/2024 06:23:12

Dispersion larvaire et cycle de vie dans les environnements hydrothermaux profonds : le cas de Rimicaris exoculata et d'espèces proches
Provedor de dados: 5
Autores: Hernandez Avila, Ivan.
Deep-water hydrothermal vent host high-biomass communities based on chemoautotrophy supported by the metabolic activity of free-living and symbiotic bacteria associated to invertebrates, especially megafauna. Knowledge on the mechanisms of dispersal and the life cycle of vent species is essential to our understanding of the vent communities in terms of distribution, structure and temporal variation. In this study, I present some advances regarding the dispersal and life cycle of a dominant species of the Mid-Atlantic Ridge (MAR) vent ecosystems, the alvinocaridid shrimp Rimicaris exoculata, and other related species. The methodological approaches applied include morphological descriptions of larvae, analysis of population biology and reproduction, and...
Tipo: Text
Palavras-chave: Sources hydrothermales profondes; Cycle de vie; Structure de population; Symbiose; Crevettes Alvinocarididae; Deep-water hydrothermal vents; Life cycle; Population structure; Reproduction; Dispersal; Symbiosis; Speciation.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00498/60927/64321.pdf

Approche métagénomique de la chimiosynthèse en système hydrothermal océanique profond : cas particulier des symbioses bactériennes associées à la crevette Rimicaris exoculata
Provedor de dados: 5
Autores: Jan, Cyrielle.
The hydrothermal shrimp Rimicaris exoculata is an endemic species of the Mid-Atlantic Ridge (MAR).This species lives in dense aggregates on the walls of active chimneys and dominates the megafauna of most of these sites. This shrimp has two distinct microbial communities whose roles remain almost unknown. One of these communities is associated with the cephalothorax and hypertrophied mouthparts.These are covered by a dense community of bacteria affiliated to chemoautotrophic epibionts associated with mineral deposits. To deepen our knowledge on the symbiotic community in the context of the thesis, a metagenomic approach was undertaken. This helped highlighting the microbial diversity present with a dominant phylum, the Proteobacteria. Two classes are...
Tipo: Text
Palavras-chave: Epibiontes; Métagénomique; Rimicaris exoculata; Symbiose; Zetaproteobacteria; Symbiosis; Epibionts; Metagenomic.
Ano: 2012
URL: https://archimer.ifremer.fr/doc/00498/60954/64357.pdf

Mode de reconnaissance hôte symbionte en milieux extrêmes : cas du modèle symbiotique Rimicaris exoculata
Provedor de dados: 5
Autores: Le Bloa, Simon.
Deprived of light, the deep-sea hydrothermal vents are extremes ecosystems sustained by micobial chemosynthesis. These environments are colonized by animal species living in close relationships with these chemoautotrophic micro-organisms, eating them or establishing long term interactions with them, may they be trophic or not only. The shrimp Rimicaris exoculata is an endemic hydrothermal species of the Mid-Atlantic Ridge (MAR) sites. This crustacean represents the predominant macrofauna of some sites of the MAR. It lives in symbiotic association with two distinct microbial communities qualified as ectosymbiosis. One is located in its gill chamber and one in its gut. First, this work focused on the study of bacterial communication (Quorum Sensing or QS)...
Tipo: Text
Palavras-chave: Écosystèmes hydrothermaux; Peptide antimicrobien; Marqueurs génétiques; Hydrothermal vent; Rimicaris exoculata; Symbiose; Quorum Sensing; Antimicrobial peptide; Genetic marker.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00498/60918/64279.pdf

Etude théorique des interactions entre des dinoflagellés et des parasitoïdes eucaryotes en environnement mélangé : persistance du système et succession phytoplanctonique
Provedor de dados: 5
Autores: Arancio, Marc.
Many species of autotrophic dinoflagellates can be parasitized by multiple eukaryotic parasitoids. These parasitoids have a specific life cycle resulting in the death of the host and the release of hundreds of zoospores that can infect a new host. Several studies have demonstrated their potential to control the host population in a few days as well as their great diversity and suggests a very complex dynamics of infection in this kind of environment. The objective of this thesis is to understand the parasitoid-dinoflagellates infection dynamics in a highly mixed estuary and a better understanding of the different interactions taking place within this system. To address this problem, we used the modeling approach (IBM). This approach has enabled to show...
Tipo: Text
Palavras-chave: Amoebophrya; Parvilucifera; Relations hôte-parasite; Dinoflagellés -- Parasites; Dinoflagellés -- Mouvements; Symbiose; Succession écologique; Cycles biologiques -- Modèles mathématiques; Écologie des estuaires; Phytoplancton.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00498/60942/64335.pdf