Consulta: creatorFacets:"Sibuet, Myriam"
Registros recuperados: 42
Data/hora: 16/06/2024 09:18:42

Description d'ixoreis psychropotae, nov. gen., nov. sp., coccidie parasite du tube digestif de l'holothurie abyssale psychropotes longicauda theel
Provedor de dados: 5
Autores: Massin, C; Jangoux, M; Sibuet, Myriam.
This paper describes some stages of gametogony and sporogony of Ixoreis psychropotae ng. nsp., hemal and digestive sporozoan parasite of the abyssal holothurian Psychropotes longicauda.Through the trophozoïte development, this sporozoan is closely related to Coccidia. The uninucleate sporoblasts are formed out of the nuclei that appear on the copula's surface. The cysts, extremely numerous in certain areas, have n sporokysts containing each 2 sporozoïtes.The possibilities of cyts' elimination are discussed. [NOT CONTROLLED OCR]
Tipo: Text
Ano: 1978
URL: http://archimer.ifremer.fr/doc/1978/publication-5189.pdf

First observations of deep-sea coral reefs along the Angola margin
Provedor de dados: 5
Autores: Le Guilloux, E.; Olu, Karine; Bourillet, Jean-francois; Savoye, Bruno; Iglesias, S. P.; Sibuet, Myriam.
The West African continental slope is an important theatre for geological survey prospecting and drilling for hydrocarbons but little is known about local deep-sea biological communities at these depths. While shallow-water reefs are common and well-known features in the tropics, only few records of deep-water corals exist at low latitudes, and most of them have been reported by historical oceanographic cruises undertaking circum-navigations of the world. This study, based on a multi-disciplinary approach, presents a description of newly discovered deep-water coral reef communities along the Angola margin. Data from ROV, multibeam bathymetry, side-scan sonar and seismics from a deep-towed acoustic system (SAR) were used to describe the morphology of the...
Tipo: Text
Palavras-chave: Lucinids; Habitat mapping; ROV; Lophelia pertusa; Deep sea corals; Angola margin.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-7403.pdf

Spatial heterogeneity of macrofaunal communities in and near a giant pockmark area in the deep Gulf of Guinea
Provedor de dados: 5
Autores: Menot, Lenaick; Galeron, Joelle; Olu, Karine; Caprais, Jean-claude; Crassous, Philippe; Khripounoff, Alexis; Sibuet, Myriam.
The structure and familial-level composition of macrofaunal communities were examined within and at distance from the giant pockmark Regab in the Southern Gulf of Guinea, at 3200 m depth. The two main questions addressed in this study were (i) does habitat partitioning by large symbiont-bearing taxa. influence macrofaunal assemblages and their environment? and (ii) to what extent does the chemosynthesis-based ecosystem influence the structure and the composition of nearby macrobenthic communities? Along two radials, at sites from 250 to 1000 m away from the active centre of the cold seep, the abundance and composition of the macrofauna were typical of a deep-sea community at that depth. Except for a few cores sampled in or near dead vesicomyid fields at...
Tipo: Text
Palavras-chave: Cold seep; Diversity; Gulf of Guinea; Habitat heterogeneity; Macrofauna; Open slope; Siboglinid tubeworms; Vesicomyid clams.
Ano: 2010
URL: https://archimer.ifremer.fr/doc/00002/11282/8099.pdf

Données préliminaires sur les résultats biologiques de la campagne Polymède I.Dragages profonds
Provedor de dados: 5
Autores: Chardy, Pierre; Laubier, Lucien; Reyss, Daniel; Sibuet, Myriam.
Le problème de l'existence d'une véritable faune abyssale en Méditerranée est depuis longtemps posé et n'est pas encore résolu. On admet généralement qu'en raison de la structure homothermique des eaux profondes méditerranéennes, la plaine abyssale est peuplée par des espèces bathyales eurybathiques sténothermes chaudes, Mais, comme le souligne PÉRÈS [1967, p. 467] l'extrême pauvreté des grandes profondeurs méditerranéennes et le nombre très limité de prélèvements faits à ce jour ne permettent guère de donner une réponse satisfaisante à cette question. [OCR NON CONTRÔLE]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1973
URL: http://archimer.ifremer.fr/doc/1973/publication-5023.pdf

Use of lipids to study the trophic ecology of deep-sea xenophyophores
Provedor de dados: 5
Autores: Laureillard, J; Mejanelle, L; Sibuet, Myriam.
Xenophyophores, widespread giant deep-sea protists, dominate the megafaunal organisms visible on the seafloor in some areas. Owing to the extreme fragility of their tests (external part), little is known about them, and their diet is largely a matter of speculation. The extensive accumulation of fecal pellets (stercomes) within their tests attests to the degree to which xenophyophores feed on particulate matter. During the EUMELI 2 cruise, xenophyophores were recovered intact at the surface of box-cores from an abyssal mesotrophic site in the northeastern Atlantic. They were identified as Syringammina corbicula. In our study, we compare the lipid composition of xenophyophores collected at the top of cores with sediment from the same mesotrophic environment...
Tipo: Text
Palavras-chave: Xenophyophores; Lipids; Nutrition; Deep sea; Northeastern tropical Atlantic.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/00000/10798/7581.pdf

Ophidiaster reyssi, nouvelle espèce d'astéride bathyale de l'océan atlantique
Provedor de dados: 5
Autores: Sibuet, Myriam.
-A new species was found among the Asteroids collected near the Açores at a depth of 350 m.This species is described and attributed to the genus Ophidiaster according to the presence of 8 series of pore areas. Some characters can be related to the genus Hacelia and Tamaria mainly the massive shape of the triangular arms and the series of subrectangular actinal plates Besides, the valvula-pedicellarian are few and are situated dorsally, further the pore areas contains more than 40 pores each, these characters are specific to Ophidiaster reyssi n. sp. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1977
URL: http://archimer.ifremer.fr/doc/1977/publication-5199.pdf

Description de stades juvéniles de plutonaster bifrons (Wyville Thomson)
Provedor de dados: 5
Autores: Sibuet, Myriam; Cherbonnier, Gustave.
The observation of a series of young individuals of growing size, belonging to the abyssal species Plutonaster bifrons (Wyv. Thomson), with scanning electron microscopy, shows the appearance and development of morphological structures. An animal of R = 5.55 mm presents enough characters to identify the species, but if its size is smaller than R = 0.85 mm, one witnesses a significant development of some specific characters.
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1972
URL: http://archimer.ifremer.fr/doc/1972/publication-5065.pdf

Biogeography and Potential Exchanges Among the Atlantic Equatorial Belt Cold-Seep Faunas
Provedor de dados: 5
Autores: Olu, Karine; Cordes, Erik E.; Fisher, Charles R.; Brooks, James M.; Sibuet, Myriam; Desbruyeres, Daniel.
Like hydrothermal vents along oceanic ridges, cold seeps are patchy and isolated ecosystems along continental margins, extending from bathyal to abyssal depths. The Atlantic Equatorial Belt (AEB), from the Gulf of Mexico to the Gulf of Guinea, was one focus of the Census of Marine Life ChEss (Chemosynthetic Ecosystems) program to study biogeography of seep and vent fauna. We present a review and analysis of collections from five seep regions along the AEB: the Gulf of Mexico where extensive faunal sampling has been conducted from 400 to 3300m, the Barbados accretionary prism, the Blake ridge diapir, and in the Eastern Atlantic from the Congo and Gabon margins and the recently explored Nigeria margin. Of the 72 taxa identified at the species level, a total...
Tipo: Text
Palavras-chave: Gulf of mexico; Barbados accretionary prism; Mussel bathymodiolus childressi; Hydrothermal vent communities; Deep sea vent; Spatial distribution; Family veiscomyidae; Dispersal barriers; Hydrocarbon seeps; Species diversity.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00011/12207/8975.pdf

Polychaete diversity at tropical Atlantic deep-sea sites: environmental effects
Provedor de dados: 5
Autores: Cosson-sarradin, Nathalie; Sibuet, Myriam; Paterson, Glj; Vangriesheim, Annick.
This study assesses how differences in nutrient flux and bottom currents affect the diversity and trophic structure of deep-sea polychaete communities from the tropical northeast Atlantic at 20 degrees to 21 degrees N latitude. Faunal assemblages were studied from 3 sets of USNEL box cores (0.25 m(2)) taken at depths of 1700, 3100 and 4600 m. In terms of primary productivity, the cores were taken beneath water which is eutrophic, mesotrophic and oligotrophic, respectively. Total polychaete abundance, abundance of dominant species, and faunal similarity and diversity were compared among the 3 sites. Polychaete abundance decreased with increasing depth. Community structure reflected environmental characteristics as well as the influence of coastal upwelling....
Tipo: Text
Palavras-chave: Deep sea; Tropical Atlantic; Diversity; Polychaete community; Environmental conditions.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00179/28978/27398.pdf

Échinodermes de la mer d'Alboran
Provedor de dados: 5
Autores: Sibuet, Myriam.
During the " Jean Charcot " cruise Polymed II, 18 species of the 5 classes of Echinodermata have been collected in 15 samples from the bathyal zone of the Alboran sea. Most species are already known from the Mediterranean and the North East Atlantic. Some rare species (Odontaster mediterranea, Ophiactis balli) have been collected, and two others (Neocomatella europaea. Henricia abyssalis) are recorded for the first time in the Mediterranean. Endemic distributions of Ceramaster hystricis and Ophiocten abyssicolum are discussed. The Echinoderms population of the Alboran sea is noteworthy for its Atlantic characteristic, which is besides, dominating in the North part of this area. The atlantic biogeographical relationships of the Echinoderm fauna of the...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1974
URL: http://archimer.ifremer.fr/doc/1974/publication-4975.pdf

ROV study of a giant pockmark on the Gabon continental margin
Provedor de dados: 5
Autores: Ondreas, Helene; Olu, Karine; Fouquet, Yves; Charlou, Jean-luc; Gay, Aurelien; Dennielou, Bernard; Donval, Jean-pierre; Fifis, Alexis; Nadalig, Thierry; Cochonat, Pierre; Cauquil, E; Bourillet, Jean-francois; Le Moigne, Morgan; Sibuet, Myriam.
A giant, 800-m wide pockmark, called Regab, was discovered along the Equatorial African margin at 3160-m water depth and was explored by remote operated vehicle (ROV) as part of the Zaiango (1998-2000) and Biozaire (2001-2003) projects carried out conjointly by TOTAL and a number of French research institutes. A microbathymetric map obtained using the ROV sensors shows that the pockmark actually consists of a cluster of smaller pockmarks aligned N70 along a 15-m deep depression. Methane was recorded all over the pockmark, the highest values along the axis of the depression where massive carbonate crusts and dense seep communities were also found. Several faunal species belong to the Vesicomyidae and Mytilidae bivalve families, as well as to Siboglinidae...
Tipo: Text
Palavras-chave: Gabon; Microbathymetric map; ROV; Exploration; Pockmark; Equatorial African margin.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-1239.pdf

Multi-disciplinary investigation of fluid seepage on an unstable margin: The case of the Central Nile deep sea fan
Provedor de dados: 5
Autores: Bayon, Germain; Loncke, L.; Dupre, Stephanie; Caprais, Jean-claude; Ducassou, E.; Duperron, Sebastien; Etoubleau, Joel; Foucher, Jean-paul; Fouquet, Yves; Gontharet, S.; Henderson, G. M.; Huguen, Caroline; Klaucke, I.; Mascle, J.; Migeon, S.; Olu-le-roy, Karine; Ondreas, Helene; Pierre, C.; Sibuet, Myriam; Stadnitskaia, A.; Woodside, J.
We report on a multidisciplinary study of cold seeps explored in the Central Nile deep-sea fan of the Egyptian margin. Our approach combines in situ seafloor observation, geophysics, sedimentological data, measurement of bottom-water methane anomalies, pore-water and sediment geochemistry, and Th-230/U dating of authigenic carbonates. Two areas were investigated, which correspond to different sedimentary provinces. The lower slope, at similar to 2100 m water depth, indicates deformation of sediments by gravitational processes, exhibiting slope-parallel elongated ridges and seafloor depressions. In contrast, the middle slope, at similar to 1650 m water depth, exhibits a series of debris-flow deposits not remobilized by post-depositional gravity processes....
Tipo: Text
Palavras-chave: Authigenic carbonate; U Th; Cold seep; Continental margin; Nile.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6586.pdf

Evidence for chemoautotrophic symbiosis in a Mediterranean cold seep clam (Bivalvia : Lucinidae): comparative sequence analysis of bacterial 16S rRNA, APS reductase and RubisCO genes
Provedor de dados: 5
Autores: Duperron, Sebastien; Fiala Medioni, Aline; Caprais, Jean-claude; Olu, Karine; Sibuet, Myriam.
Symbioses between lucinid clams (Bivalvia: Lucinidae) and autotrophic sulphide-oxidizing bacteria have mainly been studied in shallow coastal species, and information regarding deep-sea species is scarce. Here we study the symbiosis of a clam, resembling Lucinoma kazani, which was recently collected in sediment cores from new cold-seep sites in the vicinity of the Nile deep-sea fan, eastern Mediterranean, at depths ranging from 507 to 1691 m. A dominant bacterial phylotype, related to the sulphide-oxidizing symbiont of Lucinoma aequizonata, was identified in gill tissue by comparative 16S rRNA gene sequence analysis. A second phylotype, related to spirochete sequences, was identified twice in a library of 94 clones. Comparative analyses of gene sequences...
Tipo: Text
Palavras-chave: Eastern Mediterranean; Cold seeps; Lucinoma; Lucinidae; Sulphide oxidizing bacteria; Symbiosis.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2176.pdf

Peuplements benthiques et caractéristiques trophiques du milieu dans la plaine abyssale de Demerara
Provedor de dados: 5
Autores: Sibuet, Myriam; Monniot, C; Desbruyeres, Daniel; Dinet, A; Khripounoff, Alexis; Rowe, G; Segonzac, Michel.
Tipo: Text
Ano: 1984
URL: http://archimer.ifremer.fr/doc/00131/24217/22210.pdf

Synallactes longipapillata nov. sp.,nouvelle espèce d'holothurie d'un genre rarement représenté dans l'océan atlantique
Provedor de dados: 5
Autores: Sibuet, Myriam.
Among the Holothurians collected in the Bay of Biscay during Biogas cruises, a new species was described and accordingly attributed to the genus Synallactes. Synallactes longipapillata n. sp. is readily distinguishable from all other known species of the genus by its very long papilla and by its spicula composed exclusively of three arms in the tegument and the papilla. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1978
URL: http://archimer.ifremer.fr/doc/1978/publication-5210.pdf

Variation in structure and biomass of the benthic communities at three contrasting sites in the tropical Northeast Atlantic
Provedor de dados: 5
Autores: Galeron, Joelle; Sibuet, Myriam; Mahaut, Ml; Dinet, A.
Three major size classes of the benthic metazoan communities (megafauna, macrofauna and meiofauna) were investigated simultaneously at 3 sites in the tropical Northeast Atlantic. The sites varied in their level of surface primary productivity (eutrophic, mesotrophic and oligotrophic). Results for 3 cruises in 3 seasons (Eumeli 2, winter 1991; Eumeli 3, autumn 1991; Eumeli 4, spring 1992) are given for each size class in terms of taxonomic composition, density and biomass. The benthic communities did not exhibit evidence of seasonal variation, but there were substantial differences in the quantitative structure of the metazoan communities between the 3 sites. Total metazoan density and biomass, as well as density and biomass of each size class, decreased...
Tipo: Text
Palavras-chave: Deep sea; Tropical Atlantic; Meiofauna; Macrofauna; Megafauna; Taxonomic composition; Density; Biomass; Environmental conditions.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00000/10519/7602.pdf

Adaptation des Echinodermes à la vie abyssale
Provedor de dados: 5
Autores: Sibuet, Myriam.
The synthesis of literature and personal observations permitted to show the main morphological physiological and genetic characteristics with relation to the mode of life of abyssal echinoderms. The large ventral sole is common among holothuroids and asteroids which creep on the bottom. The development of large podia and their ability to swim are particular to the abyssal family Elasipoda (Holothurioidea). The paper gives examples of opposite skeleton constitution either heavily or lightly calcified. The little knowledge about the biology of these animals shows the absence of a strict diet and of a particular mode of reproduction. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/1979/publication-5408.pdf

Cold-seep assemblages on a giant pockmark off West Africa: spatial patterns and environmental control
Provedor de dados: 5
Autores: Olu, Karine; Caprais, Jean-claude; Fifis, Alexis; Fabri, Marie-claire; Galeron, Joelle; Budzinsky, H; Le Menach, K; Khripounoff, Alexis; Ondreas, Helene; Sibuet, Myriam.
A giant pockmark colonised by dense cold-seep assemblages near 3160 m depth along the Congo-Angola margin has been surveyed by the ROV Victor 6000. The quantitative distribution of chemosynthetic communities was mapped along the dive tracks from a video study using GIS and image mosaicking. Several types of faunal assemblages, either dominated by bivalves of the families Mytilidae (Bathmodiolus sp.) Vesicom idae (Calyptogena sp., 'Vesicomya' aff. chuni), or by Siboglinidae polychaetes (Escarpia southwardae) were mapped over the 800-m diameter pockmark area and sampled for fauna, water and sediment. The isotopic analyses (delta C-13) of tissues from symbiont-bearing species were within the range typical of nutrition via symbiosis using methane for mussels...
Tipo: Text
Palavras-chave: Symbiont bearing species; Spatial distribution; Methane; Megafauna; Cold seeps.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2681.pdf

Ophieulima (Mollusca, prosobranchia), a new genus of ophiuroid parasites
Provedor de dados: 5
Autores: Waren, A; Sibuet, Myriam.
The genus Ophieulima is erected for Stilifer minima DALL, 1927, which has been found to be a parasite of the ophiuroid Ophiactis abyssicola (M.SARS).O. minima has planktotrophic larvae and occurs on both sides of the N. Atlantic. The sexes are separate and the fernale attaches the egg capsules on the shell of the male. The snail is attached by a snout-resembling organ to the aboral body wall of the host and introduces its proboscis into the body of the ophiuroid. The species of Stilifer, on the contrary, live in galls in the body wall of astéroids. They have a snout that is modified to a sac-like wrapping, covering most of the shell.
Tipo: Text
Ano: 1981
URL: http://archimer.ifremer.fr/doc/1981/publication-5357.pdf

Unexpected co-occurrence of six bacterial symbionts in the gills of the cold seep mussel Idas sp (Bivalvia : Mytilidae)
Provedor de dados: 5
Autores: Duperron, Sebastien; Halary, S; Lorion, J; Sibuet, Myriam; Gaill, F.
Bathymodioline mussels occur in chemosynthesis-based ecosystems such as cold seeps, hydrothermal vents and organic debris worldwide. Their key adaptation to these environments is their association with bacterial endosymbionts which ensure a chemosynthetic primary production based on the oxidation of reduced compounds such as methane and sulfide. We herein report a multiple symbiosis involving six distinct bacterial 16S rRNA phylotypes, including two belonging to groups not yet reported as symbionts in mytilids, in a small Idas mussel found on carbonate crusts in a cold seep area located north to the Nile deep-sea fan (Eastern Mediterranean). Symbionts co-occur within hosts bacteriocytes based on fluorescence in situ hybridizations, and sequencing of...
Tipo: Text
Palavras-chave: Eastern Mediterranean; Cold seeps; Bathymodiolus; Idas; Mytilidae; Symbiosis.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-3928.pdf

Ecological and genetical survey on two deep-sea holothurians: Benthogone rosea and Benthodytes typica
Provedor de dados: 5
Autores: Bisol, Paolo Maria; Costa, Rodolfo; Sibuet, Myriam.
Tipo: Text
Ano: 1984
URL: http://archimer.ifremer.fr/doc/00179/28991/27415.pdf

Dual symbiosis in a Bathymodiolus sp mussel from a methane seep on the gabon continental margin (southeast Atlantic): 16S rRNA phylogeny and distribution of the symbionts in gills
Provedor de dados: 5
Autores: 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

Deep-sea environment and biodiversity of the West African Equatorial margin
Provedor de dados: 5
Autores: 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

La nutrition d'echinodermes abyssaux I. Alimentation des holothuries
Provedor de dados: 5
Autores: 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
Ano: 1980
URL: http://archimer.ifremer.fr/doc/1980/publication-5309.pdf

Résultats scientifiques de la campagne Noratlante : Astérides et Ophiurides
Provedor de dados: 5
Autores: Cherbonnier, Gustave; Sibuet, Myriam.
During the Northatlantic campaign of the "Jean Charcot" in the North Atlantic, an important collection of Echinoderms has been collected. In this note are pointed out thirty one species of Asterids, one is new for Science, and there are four new species of Ophiurids among the twenty-eight studied. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1972
URL: http://archimer.ifremer.fr/doc/1972/publication-5040.pdf

Constance du nombre chromosomique chez les échinodermes
Provedor de dados: 5
Autores: 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

Seafloor geological studies above active gas chimneys off Egypt (Central nile deep sea fan)
Provedor de dados: 5
Autores: 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

Influence of seep emission on the non-symbiont-bearing fauna and vagrant species at an active giant pockmark in the Gulf of Guinea (Congo-Angola margin)
Provedor de dados: 5
Autores: 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

Diversity and distribution of methane-oxidizing microbial communities associated with different faunal assemblages in a giant pockmark of the Gabon continental margin
Provedor de dados: 5
Autores: 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

Deep-Sea Biodiversity in the Mediterranean Sea: The Known, the Unknown, and the Unknowable
Provedor de dados: 5
Autores: 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
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00011/12206/8974.pdf

A photographic survey of a population of the stalked crinoid Diplocrinus (Annacrinus) wyvillethomsoni (Echinodermata) from the bathyal slope of the Bay of Biscay
Provedor de dados: 5
Autores: 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

Astérides abyssales de l'Atlantique sud. (Résultats de la campagne Walda, juin-juillet-août 1971)
Provedor de dados: 5
Autores: 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

Deep-sea habitat heterogeneity influence on meiofaunal communities in the Gulf of Guinea
Provedor de dados: 5
Autores: Van Gaever, Saskia; Galeron, Joelle; Sibuet, Myriam; Vanreusel, Ann.
To estimate the degree of spatial heterogeneity of benthic deep-sea communities, we carried out a multiple-scale (from m's to 200km) investigation in the Congo-Angola margins (Equatorial West African margin, 3150-4800 m) in which we examined the metazoan meiofauna at a variety of habitats along the Congo Channel system and in the associated cold seep. We investigate the structure, density, vertical distribution patterns in the sediment and biomass of meiofaunal communities in the Gulf of Guinea and how they are controlled by hydrologic and biogeochemical processes The meiofaunal. communities in the Gulf of Guinea were shaped by heterogeneous conditions on the margin, and reflect the multiple-scale spatial variability that corresponds with the different...
Tipo: Text
Palavras-chave: Gulf of Guinea; Nematodes; Meiofauna; Cold seep; Congo canyon; West equatorial Africa margin deep sea.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-7483.pdf

Distribution and diversity of asteroids in atlantic abyssal basins
Provedor de dados: 5
Autores: 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

The influence of geological, geochemical, and biogenic habitat heterogeneity on seep biodiversity
Provedor de dados: 5
Autores: 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

CAMPAGNES BIOGAS. 3 août 1972 - 4 novembre 1974
Provedor de dados: 5
Autores: 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
Ano: 1977
URL: https://archimer.ifremer.fr/doc/00379/49012/49447.pdf

Ecology of the benthic communities of the deep North East Atlantic
Provedor de dados: 5
Autores: 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

Dragages profonds en mer Ionienne - données préliminaires
Provedor de dados: 5
Autores: 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

Cherbonniera utriculus gen. nov., sp. nov., petite Holothurie (Molpadonia, Molpadiidae) des vases abyssales du nord-est atlantique
Provedor de dados: 5
Autores: 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

Some quantitative results on benthic communities of the deep Norwegian Sea
Provedor de dados: 5
Autores: 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

Le genre Hymenaster (Astérides) dans l'océan Atlantique
Provedor de dados: 5
Autores: Sibuet, Myriam.
Several species of the genus Hymenaster (Asteroidea) collected in the abyssal cruises Biaçores, Biogas and Polygas in the North East Atlantic Ocean make possible a synthesis of available data on the species known from the Atlantic Ocean.  Two species H. reticulatus and H. tenuispinus are new to Science. A morphological comparative study is carried out for the 17 species reviewed and is presented in the form of a tabular key. The bathymetrical and geographical distributions are included. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1976
URL: http://archimer.ifremer.fr/doc/1976/publication-5094.pdf

Dragages profonds en mer Egée - données préliminaires
Provedor de dados: 5
Autores: Chardy, Pierre; Laubier, Lucien; Reyss, Daniel; Sibuet, Myriam.
La seconde partie de la campagne Polymède II, organisée par le Département Scientifique du Centre Océanologique de Bretagne sur le N.O. Jean-Charcot (avril 1972) a été axée sur l'étude de la fosse nord égéenne. [OCR NON CONTRÔLE]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1973
URL: http://archimer.ifremer.fr/doc/1973/publication-5133.pdf