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Cycles biogéochimiques du Fer et du Soufre dans les systèmes hydrothermaux en contexte sédimentaire du Bassin de Guaymas : traçages isotopiques et interactions micro-organismes/minéraux ArchiMer
Callac, Nolwenn.
Active hydrothermal chimney and sediments of the Guaymas Basin (Mexico) host various microbial communities with different metabolisms, including those involved in biogeochemical cycles of sulfur and iron. It is established that, in these dynamic ecosystems, microbial activity depends on the availability of substrates in their environment and that prokaryotes could, in return locally affect the composition of the hydrothermal fluid and mineralogical composition of the chimney or sediment, by mediating the dissolution and / or precipitation of some mineral phases. In order to study these prokaryotes-biotope interactions, and establish links between the structure, the activity and the isotopic signatures of microbial communities with the physico-chemical...
Tipo: Text Palavras-chave: Interactions procaryotes-biotopes; Cycle du fer; Cycle du soufre; Thermophiles; Cultures en bioréacteurs; Cultures en fioles; Module de colonisation in situ; Isotopie du fer; Isotopie du soufre; Systèmes hydrothermaux du Bassin de Guaymas; Prokaryote-biotope interactions; Iron cycle; Sulfur cycle; Thermophilic micro-organisms; Cultures in bioreactors; Cultures in batch; In situ colonization module; Iron isotope; Sulfur isotope; Hydrothermal systems of Guaymas Basin.
Ano: 2013 URL: https://archimer.ifremer.fr/doc/00498/60953/64356.pdf
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Microbial Communities of the Shallow-Water Hydrothermal Vent Near Naples, Italy, and Chemosynthetic Symbionts Associated With a Free-Living Marine Nematode ArchiMer
Bellec, Laure; Cambon-bonavita, Marie-anne; Durand, Lucile; Aube, Johanne; Gayet, Nicolas; Sandulli, Roberto; Brandily, Christophe; Zeppilli, Daniela.
Shallow-water hydrothermal vents are widespread, especially in the Mediterranean Sea, owing to the active volcanism of the area. Apart free microbial communities’ investigations, few biological studies have been leaded yet. Investigations of microbial communities associated with Nematoda, an ecologically important group in sediments, can help to improve our overall understanding of these ecosystems. We used a multidisciplinary-approach, based on microscopic observations (scanning electron microscopy: SEM and Fluorescence In Situ Hybridization: FISH) coupled with a molecular diversity analysis using metabarcoding, based on the 16S rRNA gene (V3-V4 region), to characterize the bacterial community of a free-living marine nematode and its environment, the...
Tipo: Text Palavras-chave: Nematode; Shallow-water hydrothermal vent; Sulfur-oxidizing bacteria; Iron cycle; Zetaproteobacteria.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00643/75544/76449.pdf
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