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| Dessandier, Pierre-antoine; Borrelli, Chiara; Kalenitchenko, Dimitri; Panieri, Giuliana. |
| Benthic foraminifera have been widely used as proxy for paleo-methane emissions, mainly based on their stable isotopic signature. In cold seeps, the ecology of these organisms remains uncertain, in particular their ability to thrive during active phases of seepage. In this study, we evaluate the benthic foraminiferal response to methane seepage in Arctic sediments. We do so by examining living and dead benthic foraminiferal assemblages (>63 mu m) of 11 push cores collected in two of the most active pockmarks (Lunde and Lomvi) along Vestnesa Ridge, offshore western Svalbard. Benthic foraminiferal assemblages are interpreted in the context of sediment geochemistry, seafloor images, and pore water analyses, which are used to characterize the different... |
| Tipo: Text |
Palavras-chave: Benthic foraminiferal assemblages; Methane advection; Methane diffusion; Arctic Ocean; Microbial mats. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00667/77894/80079.pdf |
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| Meistertzheim, Anne. -leila; Lartaud, Franck; Arnaud-haond, Sophie; Kalenitchenko, Dimitri; Bessalam, Manon; Le Bris, Nadine; Galand, Pierre E.. |
| Cold-water corals (CWC) are main ecosystem engineers of the deep sea, and their reefs constitute hot-spots of biodiversity. However, their ecology remains poorly understood, particularly, the nature of the holobiont formed by corals with their associated bacterial communities. Here, we analysed Madrepora oculata and Lophelia pertusa samples, collected from one location in a Mediterranean canyon in two different seasons (autumn and spring), in order to test for species specificity and temporal stability of the host-bacteria associations. The 16S rRNA sequencing revealed host-specific patterns of bacterial communities associated with L. pertusa and M. oculata, both in terms of community composition and diversity. All analyzed M. oculata polyps exhibited... |
| Tipo: Text |
Palavras-chave: Deep-Sea corals; Madrepora oculata; Lophelia pertusa; Bacterial communities; Bacterial ecology; Mediterranean Sea; Microbe-microbe and microbe-host interactions. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00332/44362/43965.pdf |
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| Carrier, Vincent; Svenning, Mette M.; Grundger, Friederike; Niemann, Helge; Dessandier, Pierre-antoine; Panieri, Giuliana; Kalenitchenko, Dimitri. |
| Cold seeps are characterized by high biomass, which is supported by the microbial oxidation of the available methane by capable microorganisms. The carbon is subsequently transferred to higher trophic levels. South of Svalbard, five geological mounds shaped by the formation of methane gas hydrates, have been recently located. Methane gas seeping activity has been observed on four of them, and flares were primarily concentrated at their summits. At three of these mounds, and along a distance gradient from their summit to their outskirt, we investigated the eukaryotic and prokaryotic biodiversity linked to 16S and 18S rDNA. Here we show that local methane seepage and other environmental conditions did affect the microbial community structure and composition.... |
| Tipo: Text |
Palavras-chave: Arctic; Methane seeps; Prokaryotes; Methanotrophs; ANME; Sulfate-reducing bacteria; Eukaryotes; Foraminifera. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00667/77893/80077.pdf |
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