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| Registros recuperados: 42 | |
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| Duperron, Sebastien; Nadalig, Thierry; Caprais, Jean-claude; Sibuet, Myriam; Fiala Medioni, Aline; Amann, Rudolf; Dubilier, Nicole. |
| Deep-sea mussels of the genus Bathymodiolus (Bivalvia: Mytilidae) harbor symbiotic bacteria in their gills and are among the dominant invertebrate species at cold seeps and hydrothermal vents. An undescribed Bathymodiolus species was collected at a depth of 3,150 m in a newly discovered cold seep area on the southeast Atlantic margin, close to the Zaire channel. Transmission electron microscopy, comparative 16S rRNA analysis, and fluorescence in situ hybridization indicated that this Bathymodiolus sp. lives in a dual symbiosis with sulfide- and methane-oxidizing bacteria. A distinct distribution pattern of the symbiotic bacteria in the gill epithelium was observed, with the thiotrophic symbiont dominating the apical region and the methanotrophic symbiont... |
| Tipo: Text |
Palavras-chave: Gabon; Southeast Atlantic; Methane seep; Hydrothermal vent; Deep sea; RRNA analysis; Methane concentration; Gill epithelium; Symbiosis; Bacteria; Mytilidae. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-1266.pdf |
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| Sibuet, Myriam; Vangriesheim, Annick. |
| The long-term BIOZAIRE multidisciplinary deep-sea environmental program on the West Equatorial African margin organized in partnership between Ifremer and TOTAL aimed at characterizing the benthic community structure in relation with physical and chemical processes in a region of oil and gas interest. The morphology of the deep Congo submarine channel and the sedimentological structures of the deep-sea fan were established during the geological ZAIANGO project and helped to select study sites ranging from 350 to 4800 m water depth inside or near the channel and away from its influence. Ifremer conducted eight deep-sea cruises on board research vessels between 2000 and 2005. Standardized methods of sampling together with new technologies such as the ROV... |
| Tipo: Text |
Palavras-chave: Cold coral; Cold seep communities; Benthos diversity; Turbidity current; Congo canyon; Gulf of Guinea. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-7349.pdf |
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| Khripounoff, Alexis; Sibuet, Myriam. |
| In deep waters, deposit-feeding holothurians represent a high percentage of the total abyssal biomass and play an important ecological role in sediment modification. The feeding of these organisms, which inhabit a nutritively poor environment, has been studied by means of analyses of intestinal contents. Four abundant species : Psychropotes longicauda Theel, Paroriza pallens (Koehler), Benthogone rosea Koehler and Molpadia blakei (Theel), collected between 2000 and 4500 m in the Bay of Biscay during three cruises organized by CNEXO-COB, were chosen for this study. The morphological characteristics of the ingested alimentary particles are described and the results of analyses of the organic matter in the guts reported. The species studied do not exhibit a... |
| Tipo: Text |
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| Ano: 1980 |
URL: http://archimer.ifremer.fr/doc/1980/publication-5309.pdf |
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| Colombera, D.; Sibuet, Myriam; Venier, G.. |
| Employing a new techniques, the chromosomes of two species of abyssal echinoderms have been studied. The karyological data here presented for four species further support the hypothesis that chromosome numbers are incredibly stable in the phylum Echinodermata. This stability can be overcome in aberrant group of recent origin, as it is proved for Pourtalesia jeffreysi. A remarkable variability of chromosome morphology has been observed in species belonging to different classes. [NOT CONTROLLED OCR] |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1976 |
URL: http://archimer.ifremer.fr/doc/1976/publication-5003.pdf |
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| Dupre, Stephanie; Woodside, J; Foucher, Jean-paul; De Lange, G; Mascle, J; Boetius, A; Mastalerz, V; Stadnitskaia, A; Ondreas, Helene; Huguen, C; Harmegnies, Francois; Gontharet, Swanne; Loncke, L; Deville, E; Niemann, H; Omoregie, E; Olu, Karine; Fiala Medioni, A; Dahlmann, A; Caprais, Jean-claude; Prinzhofer, A; Sibuet, Myriam; Pierre, C; Damste, J. |
| Four mud volcanoes of several kilometres diameter named Amon, Osiris, Isis, and North Alex and located above gas chimneys on the Central Nile Deep Sea Fan, were investigated for the first time with the submersible Nautile. One of the objectives was to characterize the seafloor morphology and the seepage activity across the mud volcanoes. The seepage activity was dominated by emissions of methane and heavier hydrocarbons associated with a major thermal contribution. The most active parts of the mud volcanoes were highly gas-saturated (methane concentrations in the water and in the sediments, respectively, of several hundreds of nmol/L and several mmol/L of wet sediment) and associated with significantly high thermal gradients (at 10 m below the seafloor,... |
| Tipo: Text |
Palavras-chave: Seafloor morphology; Methane; Authigenic carbonate precipitation; Gas chimneys; Mud breccia; Mud volcanoes; Fluid seepage; Nile fan. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-4455.pdf |
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| Olu, Karine; Caprais, Jean-claude; Galeron, Joelle; Causse, R.; Von Cosel, R.; Budzinski, H.; Le Menach, K.; Le Roux, C.; Levache, D.; Khripounoff, Alexis; Sibuet, Myriam. |
| Detailed surveying with an ROV found that a dense and diverse cold-seep community colonises a giant pockmark located at 3200 m depth, 8 km north from the deep Congo channel. Several types of assemblages, either dominated by Mytilidae and Vesicomyidae bivalves or Siboglinidae polychaetes, are distributed on the 800-m diameter active area. The site is characterised by a most active central zone in a depression with abundant carbonate concretions and high methane fluxes where high-density clusters of mussels and siboglinids dominate. In contrast, the peripheral zones display large fields of dead and live vesicomyids on soft sediment, with a lower mean density and lower methane concentration in seawater. The associated megafauna includes Alvinocarididae... |
| Tipo: Text |
Palavras-chave: Congo Angola margin; Atlantic Equatorial African margin; Vagrant species; Isotopic signature; Megafauna; Cold seep. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-7478.pdf |
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| Cambon-bonavita, Marie-anne; Nadalig, Thierry; Roussel, Erwan; Delage, Eloise; Duperron, Sebastien; Caprais, Jean-claude; Boetius, A.; Sibuet, Myriam. |
| A giant 800-m-diameter pockmark named REGAB was discovered on the Gabon continental margin actively emitting methane at a water depth of 3200 m. The microbial diversity in sediments from four different assemblages of chemosynthetic organisms, Mytilidae, Vesicomyidae, Sibogliniclae and a bacterial mat, was investigated using comparative 16S rRNA gene sequence analysis. Aggregates of anaerobic methanotrophic archaea (ANME-2) and bacteria of the Desulfosarcina/Desulfococcus cluster were found in all four chemosynthetic habitats. Fluorescence in situ hybridization targeting the ANME-2/Desulfosarcina/Desulfococcus aggregates showed their presence few centimeters (3-5cm) below the surface of sediment. 16S rRNA gene sequences from all known marine ANME groups... |
| Tipo: Text |
Palavras-chave: Microbial phylogeny; Faunal assemblage; Cold seep; Chemosynthetic ecosystems; AOM; REGAB. |
| Ano: 2009 |
URL: https://archimer.ifremer.fr/doc/2009/publication-7298.pdf |
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| Danovaro, Roberto; Batista Company, Joan; Corinaldesi, Cinzia; D'Onghia, Gianfranco; Galil, Bella; Gambi, Cristina; Gooday, Andrew J.; Lampadariou, Nikolaos; Luna, Gian Marco; Morigi, Caterina; Olu, Karine; Polymenakou, Paraskevi; Ramirez-llodra, Eva; Sabbatini, Anna; Sarda, Francesc; Sibuet, Myriam; Tselepides, Anastasios. |
| Deep-sea ecosystems represent the largest biome of the global biosphere, but knowledge of their biodiversity is still scant. The Mediterranean basin has been proposed as a hot spot of terrestrial and coastal marine biodiversity but has been supposed to be impoverished of deep-sea species richness. We summarized all available information on benthic biodiversity (Prokaryotes, Foraminifera, Meiofauna, Macrofauna, and Megafauna) in different deep-sea ecosystems of the Mediterranean Sea (200 to more than 4,000 m depth), including open slopes, deep basins, canyons, cold seeps, seamounts, deep-water corals and deep-hypersaline anoxic basins and analyzed overall longitudinal and bathymetric patterns. We show that in contrast to what was expected from the sharp... |
| Tipo: Text |
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| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00011/12206/8974.pdf |
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| Conan, Gérard; Roux, Michel; Sibuet, Myriam. |
| During the 1973 cruise of the BIOGAS deep-sea program, a series of 83 frames showing a high population density of the isocrinid stalked crinoid Diplocrinus (Annacrinus) wyvillethomsoni was obtained from a depth of 1246 m on the bathyal slope of the Bay of Biscay. The spatial distribution of D. wyvillethomsoni appears to be highly aggregated. Mean density is 0.61 m-² with confidence limits determined as 0.53 and 0.69 m-², ranging up to 8 or 10 specimens m-² on a sea floor with pebbles and rocks. D. wyvillethomsoni forms a parabolic filtration fan with its arms strongly recurved into the current. The distal group of cirri grips pebbles or the sharp upper edges of rocks. This active mode of anchorage contrasts with the passive mode in other genera of... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1980 |
URL: http://archimer.ifremer.fr/doc/1980/publication-5326.pdf |
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| Sibuet, Myriam. |
| :During Walda cruise of the "Jean Charcot", 21 Asterids species were collected in the abyssal plain of South East Atlantic. Two new species are described : Dytaster cherbonnieri and Benthopecten chardyi. The analysis of infraspecific variations of Freyella spinosa makes doubtfull the validity of F. spinosa var. abyssicola. Most species are widely distributed in the whole atlantic Ocean ; they were previously known merely from the Northern Atlantic. The Walvis ridge does not appear as a boundary for the dispersion of the Asterids. [NOT CONTROLLED OCR] |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1975 |
URL: http://archimer.ifremer.fr/doc/1975/publication-5426.pdf |
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| Sibuet, Myriam. |
| Since the last survey of the distribution of the echinoderm fauna in the deep sea, worked out by MADSEN, more than 100 trawlings in various areas of the Atlantic Ocean give new possibilities of characterizing the faunal assemblages of several basins at depths greater than 1800 m. During 12 cruises conducted by the Centre Océanologique de Bretagne, seven atlantic basins (Cape, Angola, European, Labrador, Greenland, and Norwegian Basins) have been intensively prospected. Comparisons of the asteroid faunas (43 species on the whole) are approached with appropriate similarity index, especially the second Kulczynski coefficient, and estimates of density and diversity of the fauna art : analysed within each basin for two ranges of depths (and 3000 m). The... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1979 |
URL: http://archimer.ifremer.fr/doc/1979/publication-5262.pdf |
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| Cordes, Erik E.; Cunha, Marina R.; Galeron, Joelle; Mora, Camilo; Olu-le Roy, Karine; Sibuet, Myriam; Van Gaever, Saskia; Vanreusel, Ann; Levin, Lisa A.. |
| Cold seeps are among the most heterogeneous of all continental margin habitats. Abiotic Sources of heterogeneity in these systems include local variability in fluid flow, geochemistry, and substrate type, which give rise to different sets of microbial communities, microbial symbiont-bearing foundation species, and associated heterotrophic species. Biogenic habitats created by microbial mats and the symbiotic species including vesicomyid clams, bathymodiolin mussels, and siboglinid tubeworms add an additional layer of complexity to seep habitats. These forms of habitat heterogeneity result in a variety of macrofaunal and meiofaunal communities that respond to changes in structural complexity, habitat geochemistry, nutrient sources, and interspecific... |
| Tipo: Text |
Palavras-chave: Beta diversity; Chemosynthetic communities; Cold seep; Continental margin; Macrofauna; Meiofauna; Metacommunity; Species accumulation. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00002/11281/7826.pdf |
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| Laubier, Lucien; Sibuet, Myriam. |
| The study of abyssal benthic communities which begun at the Centre Océanologique de Bretagne in 1969 has been pursued during the seven cruises BIOGAS carried out from 1972 to 1974, devoted to the intensive exploration of a restricted area in the Gulf of Biscay. The frequency and total number of cruises conducted at different periods of the year enable to collect adequately large amonts of data in order to describe the faunal assemblages, to evaluate density and diversity of the fauna as well as assumed biological rythms. Six stations located on soft bottoms between 1800 m and 4700 min the north west and south east of the Gulf of Biscay have been choosen. Each station has been sampled several times with various types of gears each of them selecting a given... |
| Tipo: Text |
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| Ano: 1977 |
URL: https://archimer.ifremer.fr/doc/00379/49012/49447.pdf |
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| Laubier, L.; Sibuet, Myriam. |
| Deep benthic communities of the Bay of Biscay (North East Atlantic) have been thoroughly sampled during seven cruises between 1972 and 1974.Some 200 samples using three main types of gear (corer, epibenthic sled and beam trawls) have been performed. Sediment characteristics (granulometry, organic content) and faunal densities for each size assemblage are given.Continental influences appear to increase macrofaunal density.Compared with other areas, the central part of the Bay of Biscay appears to have a low faunal density. This fact can be related to the existence of a mesoscale gyre of the upper layer, which could be responsible for a low primary productivity. [NOT CONTROLLED OCR] |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1979 |
URL: http://archimer.ifremer.fr/doc/1979/publication-5267.pdf |
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| Chardy, Pierre; Laubier, Lucien; Reyss, Daniel; Sibuet, Myriam. |
| During the Polymede II cruise conducted by the R.S. "Jean-Charcot" and organized by the Scientifc department of the C.O.B., two sectors of the Ionian Sea have been the focus of a biological study of the benthic populations: the abyssal plain of Messine (abyssal being used here in its topographic meaning, that is to say a central basin away from the coast), and the Matapan South trench, to the south-west of the Peloponnesus. Samples were taken using an epibenthic drag with an automatic closing system enabling the catch of pelagic animals during the haulback and the loss of benthic samples. |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1973 |
URL: http://archimer.ifremer.fr/doc/1973/publication-5132.pdf |
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| Sibuet, Myriam. |
| Sea cucumbers of the Molpadonia order are average size animals, frequently found on deep muddy sea bottoms. The Molpadonia order, often reorganized by Clark (2), Heding (3), Deichman (4) and Pawson (5), currently consists of four families. Several abnormally small specimens, of a new genus, possibly belonging to the Molpadiidae, were collected with an epibenthic drag during the Polygas (October 1972) and Biogas 4 (February 1974) cruises at the following stations. |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1974 |
URL: http://archimer.ifremer.fr/doc/1974/publication-5454.pdf |
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| Laubier, Lucien; Sibuet, Myriam; Dahl, Erik; Stromberg, Jarl-ove. |
| In July-August 1975 a joint French-Swedish expedition (NORBI) with Norwegian participation explored the abyssal benthic fauna of the Norwegian sea about which previous knowledge was fragmentary. Sampling was carried out in depths between 2465 and 3718 m at 11 stations located in all four deep basins, viz the Norwegian (3), Lofoten (2), Spitsbergen (1), and Greenland (5) basins. The gears used were box corer, epibenthic sled, beam trawl, baited trap, and camera sed. [NOT CONTROLLED OCR] |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1976 |
URL: http://archimer.ifremer.fr/doc/1976/publication-5185.pdf |
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| Registros recuperados: 42 | |
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