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Microorganisms persist at record depths in the subseafloor of the Canterbury Basin ArchiMer
Ciobanu, Maria Cristina; Burgaud, Gaetan; Dufresne, Alexis; Breuker, Anja; Redou, Vanessa; Ben Maamar, Sarah; Gaboyer, Frederic; Vandenabeele-trambouze, Odile; Lipp, Julius Sebastian; Schippers, Axel; Vandenkoornhuyse, Philippe; Barbier, Georges; Jebbar, Mohamed; Godfroy, Anne; Alain, Karine.
The subsurface realm is colonized by microbial communities to depths of >1000 meters below the seafloor (m.b.sf.), but little is known about overall diversity and microbial distribution patterns at the most profound depths. Here we show that not only Bacteria and Archaea but also Eukarya occur at record depths in the subseafloor of the Canterbury Basin. Shifts in microbial community composition along a core of nearly 2 km reflect vertical taxa zonation influenced by sediment depth. Representatives of some microbial taxa were also cultivated using methods mimicking in situ conditions. These results suggest that diverse microorganisms persist down to 1922 m.b.sf. in the seafloor of the Canterbury Basin and extend the previously known depth limits of...
Tipo: Text Palavras-chave: Deep biosphere; Subsurface life; Eukaryote; Record depth.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00201/31243/29895.pdf
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Probing connections between deep earth and surface processes in a land-locked ocean basin transformed into a giant saline basin: the Mediterranean GOLD project ArchiMer
Rabineau, Marina; Cloetingh, S.; Kuroda, J.; Aslanian, Daniel; Droxler, A.; Gorini, C.; Garcia-castellanos, D.; Moscariello, A.; Burov, E.; Sierro, F.; Lirer, F.; Roure, F.; Pezard, P. A.; Matenco, L.; Hello, Y.; Mart, Y.; Camerlenghi, A.; Tripati, A..
During the last decade, the interaction of deep processes in the lithosphere and mantle with surface processes (erosion, climate, sea-level, subsidence, glacio-isostatic readjustment) has been the subject of heated discussion. The use of a multidisciplinary approach linking geology, geophysics, geodesy, modelling, and geotechnology has led to the awareness of coupled deep and surface processes. Deep earth dynamics (topography, erosion, tectonics) are strongly connected to natural hazards such as earthquakes, landslides, and tsunamis; sedimentary mass transfers have important consequences on isostatic movements and on georesources, geothermal energy repartitions. The ability to read and understand the link between deep Earth dynamics and surface processes...
Tipo: Text Palavras-chave: Deep drilling; Geodynamics; Passive margins; Paleoclimate; Messinian erosional and salinity crisis; Deep biosphere; Georesources.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00256/36741/35342.pdf
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Subseafloor archaeal communities: from the surface to a deep hot biosphere? ArchiMer
Roussel, Erwan.
The sub-seafloor biosphere may contain two thirds of Earth's total prokaryotic biomass. The large and active microbial populations buried in the sub-seafloor play a key role in global biogeochemical cycles. However, little is known about these prokaryotic communities. The depth limit of this sub-seafloor biosphere is still unreached, and elevated temperatures as well as insufficient energy sources are the likely factors limiting life at depth. Interestingly, archaeal communities with unknown physiologies and no cultured relatives seem to have a key role in deep marine sediments and hydrothermal ecosystems. As most deep biosphere microorganisms detected so far have been extremely resistant to cultivation, molecular approaches remain to date the most...
Tipo: Text Palavras-chave: Sediment; Hydrothermal system; Ultramafic; CM DGGE; DGGE; PmoA; DsrA; McrA; AmoA; 16SrRNA; Bacteria; Archaea; Deep biosphere; Sédiment; Écosystème hydrothermal; Ultramafique; CM DGGE; DGGE; PmoA; DsrA; McrA; AmoA; 16SrRNA; Bacteria; Archaea; Biosphère profonde.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/these-4630.pdf
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The many ways of coping with pressure ArchiMer
Oger, Philippe M.; Jebbar, Mohamed.
The current paper reviews strategies employed by microorganisms from the deep biosphere, especially piezophiles (from the greek piezo = to press and philo = love), to cope with high hydrostatic pressure (HHP) prevailing in these biotopes. The aim of this review is not to constitute an exhaustive report of our current knowledge on the physiology of piezophiles, as recent reviews have covered part of this subject in detail (Abe, 2007; Lauro and Bartlett, 2008; Michiels et al., 2008; Simonato et al., 2006). Rather, we illustrate here, via a few chosen examples, where we stand in our understanding of the mechanisms employed by microorganisms from the depths of our planet to cope with HHP. (C) 2010 Institut Pasteur. Published by Elsevier Masson SAS. All rights...
Tipo: Text Palavras-chave: Adaptation and evolution; Archaea; Deep biosphere; High hydrostatic pressure; Piezophile; Stress response.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00027/13797/11043.pdf
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