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| Parkes, R. John; Cragg, Barry; Roussel, Erwan; Webster, Gordon; Weightman, Andrew; Sass, Henrik. |
| A general review of the sub-seafloor biosphere is presented. This includes an update and assessment of prokaryotic cell distributions within marine sediments, current deepest 1922 m, and the impact of this on global sub-seafloor biomass estimates. These global estimates appear relatively robust to different calculation approaches and our updated estimate is 5.39 × 1029 cells, taking into consideration new data from very low organic matter South Pacific Gyre sediments. This is higher than other recent estimates, which is justified as several sediments, such as gas hydrate deposits and oil reservoirs, can have elevated cell concentrations. The proposed relationship between elevated cell concentrations and Milankovitch Cycles in sequential diatom rich layers... |
| Tipo: Text |
Palavras-chave: Sub-seafloor biosphere; Marine microbiology; Prokaryotic diversity; Dark energy; Biosphere:geosphere interactions. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00178/28965/27711.pdf |
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| Garel, Marc; Bonin, Patricia; Martini, Severine; Guasco, Sophie; Roumagnac, Marie; Bhairy, Nagib; Armougom, Fabrice; Tamburini, Christian. |
| The pelagic realm of the dark ocean is characterized by high hydrostatic pressure, low temperature, high-inorganic nutrients, and low organic carbon concentrations. Measurements of metabolic activities of bathypelagic bacteria are often underestimated due to the technological limitations in recovering samples and maintaining them under in situ environmental conditions. Moreover, most of the pressure-retaining samplers, developed by a number of different labs, able to maintain seawater samples at in situ pressure during recovery have remained at the prototype stage, and therefore not available to the scientific community. In this paper, we will describe a ready-to-use pressure-retaining sampler, which can be adapted to use on a CTD-carousel sampler. As well... |
| Tipo: Text |
Palavras-chave: Pressure-retaining sampler; Deep sea; In situ sampling; Prokaryotic activities; Prokaryotic diversity. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00688/79992/82967.pdf |
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