|
|
|
| Registros recuperados: 58 | |
|
|
| Cruaud, Perrine; Decker, Carole; Olu, Karine; Arnaud-haond, Sophie; Papot, Claire; Le Baut, Jocelyn; Vigneron, Adrien; Khripounoff, Alexis; Gayet, Nicolas; Cathalot, Cecile; Caprais, Jean-claude; Pignet, Patricia; Godfroy, Anne; Cambon Bonavita, Marie-anne. |
| This study provides an analysis of vesicomyid bivalve–symbiont community distribution across cold seep and hydrothermal vent areas in the Guaymas Basin (Gulf of California, Mexico). Using a combination of morphological and molecular approaches including fluorescent in situ hybridization (FISH), and electronic microscopy observations, vesicomyid clam species and their associated symbionts were characterized and results were analyzed in light of geochemical conditions and other on‐site observations. A greater diversity of vesicomyids was found at cold seep areas, where three different species were present (Phreagena soyoae [syn. kilmeri], Archivesica gigas, and Calyptogena pacifica). In contrast, A. gigas was the only species sampled across the hydrothermal... |
| Tipo: Text |
Palavras-chave: Deep-sea ecosystems; Guaymas Basin; Marine ecology; Pliocardinae bivalve; Sulfur storage; Vesicomyid movements. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00493/60426/64028.pdf |
| |
|
| |
|
|
| Feseker, Tomas; Boetius, Antje; Wenzhofer, Frank; Blandin, Jerome; Olu, Karine; Yoerger, Dana R.; Camilli, Richard; German, Christopher R.; De Beer, Dirk. |
| Submarine mud volcanoes are important sources of methane to the water column. However, the temporal variability of their mud and methane emissions is unknown. Methane emissions were previously proposed to result from a dynamic equilibrium between upward migration and consumption at the seabed by methane-consuming microbes. Here we show non-steady-state situations of vigorous mud movement that are revealed through variations in fluid flow, seabed temperature and seafloor bathymetry. Time series data for pressure, temperature, pH and seafloor photography were collected over 431 days using a benthic observatory at the active Hakon Mosby Mud Volcano. We documented 25 pulses of hot subsurface fluids, accompanied by eruptions that changed the landscape of the... |
| Tipo: Text |
|
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00245/35601/34137.pdf |
| |
|
|
| 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 |
| |
|
|
| Sarradin, Pierre-marie; Sarrazin, Jozee; Cadiou, Jean-francois; Olu, Karine; Desbruyeres, Damien; Rigaud, Vincent; Drogou, Jean-francois; Lecornu, Fabrice; Rolin, Jean-francois; Vuillemin, Renaud; Cambon-bonavita, Marie-anne; Sauter, E; Von Juterzenka, K; Boetius, A; Santos, Rs; Colaco, Ana; Pascoal, A; Oliveira, Paulo; Shillito, Bruce; Zal, F; Schultz, A; Taylor, P; Lane, D; Loke, Rob; Du Buf, H; Waldmann, C; Cormack, A; Sanfilippo, L; Masson, M. |
| The general objective of EXOCET/D is to develop, implement and test specific instruments aimed at exploring, describing, quantifying and monitoring biodiversity in deep-sea fragmented habitats as well as at identifying links between community structure and environmental dynamics. Onboard experimental devices will complement the approach, enabling experiments on species physiology. The EXOCET/D working fields include: video and acoustic imagery, in situ analysis of physico-chemical factors, quantitative sampling of macroand micro-organisms, in vivo experiments, integration of multidisciplinary data, implementation on European deep-submersibles and a final phase of technical and scientific validation |
| Tipo: Text |
Palavras-chave: Deep sea; Ecosystem; Imagery; In situ analysis; Faunal sampling; Submersibles; Observatory. |
| Ano: 2004 |
URL: https://archimer.ifremer.fr/doc/2007/publication-3600.pdf |
| |
|
|
| Sen, Arunima; Dennielou, Bernard; Tourolle, Julie; Arnaubec, Aurelien; Rabouille, Christophe; Olu, Karine. |
| This study characterizes the habitats and megafaunal community of the Congo distal lobe complex driven by turbidity currents through the use of remotely operated vehicle (ROV) still imagery transects covering distances in the order of kilometers. In this sedimentary, abyssal area about 5000 m deep and 750 km offshore from western Africa, large quantities of deposited organic material supplied by the Congo River canyon and channel support aggregations of large sized foraminifers (Bathysiphon sp.) and vesicomyid clams (Christineconcha regab, Abyssogena southwardae) often associated with methane cold seeps, as well as opportunistic deep-sea scavengers. Additionally, bacterial mats, assumed to be formed by large sulfur-oxidizing filamentous bacteria (Beggiatoa... |
| Tipo: Text |
|
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00385/49614/50126.pdf |
| |
|
|
| 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 |
| |
|
| |
|
|
| Marcon, Yann; Ondreas, Helene; Sahling, Heiko; Bohrmann, Gerhard; Olu, Karine. |
| Pockmarks are seafloor depressions commonly associated with fluid escape from the seabed and are believed to contribute noticeably to the transfer of methane into the ocean and ultimately into the atmosphere. They occur in many different areas and geological contexts, and vary greatly in size and shape. Nevertheless, the mechanisms of pockmark growth are still largely unclear. Still, seabed methane emissions contribute to the global carbon budget, and understanding such processes is critical to constrain future quantifications of seabed methane release at local and global scales. The giant Regab pockmark (9 degrees 42.6' E, 5 degrees 47.8' S), located at 3160 m water depth near the Congo deep-sea channel (offshore southwestern Africa), was investigated... |
| Tipo: Text |
|
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00186/29731/28293.pdf |
| |
|
|
| Portail, Marie; Olu, Karine; Dubois, Stanislas; Escobar-briones, Elva; Gelinas, Yves; Menot, Lenaick; Sarrazin, Jozee. |
| In the Guaymas Basin, the presence of cold seeps and hydrothermal vents in close proximity, similar sedimentary settings and comparable depths offers a unique opportunity to assess and compare the functioning of these deep-sea chemosynthetic ecosystems. The food webs of five seep and four vent assemblages were studied using stable carbon and nitrogen isotope analyses. Although the two ecosystems shared similar potential basal sources, their food webs differed: seeps relied predominantly on methanotrophy and thiotrophy via the Calvin-Benson-Bassham (CBB) cycle and vents on petroleum-derived organic matter and thiotrophy via the CBB and reductive tricarboxylic acid (rTCA) cycles. In contrast to symbiotic species, the heterotrophic fauna exhibited high... |
| Tipo: Text |
|
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00353/46390/46018.pdf |
| |
|
|
| Ondreas, Helene; Olu, Karine; Dupre, Stephanie; Scalabrin, Carla; Alix, Anne-sophie; Garrocq, Clément; Ruffine, Livio. |
| The Sea of Marmara hosts part of the North Anatolian Fault as an active submarine strike-slip fault. This area has suffered numerous earthquakes and presents a major seismic risk. Although the Sea of Marmara has been studied for many years, the link between geological morphostructures, the nature of fluids and biological communities is still rarely described. During the Marsite cruise (November 2014), dives with Remotely Operated Vehicle (ROV) VICTOR 6000 focused on detailed seafloor explorations of four different areas: the Central and Western highs and the Tekirdağ and Çinarcik basins. Based on 130 h of in situ videos, high-resolution seafloor mapping of seeps was conducted, emphasizing their significant geological and biological diversity from one... |
| Tipo: Text |
Palavras-chave: Sea of Marmara; Cold seeps; Fluids; Seismogenic faults; Chemosynthetic fauna; Methane. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00624/73623/73040.pdf |
| |
|
|
| Decker, Carole; Zorn, N.; Potier, N.; Leize-wagner, E.; Lallier, F.h.; Olu, Karine; Andersen, A. C.. |
| Vesicomyid bivalves form dense clam beds in both deep-sea cold seeps and hydrothermal vents. The species diversity within this family raises questions about niche separation and specific adaptations. To compare their abilities to withstand hypoxia, we have studied the structure and function of erythrocyte hemoglobin (Hb) and foot myoglobin (Mb) from two vesicomyid species, Christineconcha regab and Laubiericoncha chuni, collected from the Regab pockmark in the Gulf of Guinea at a depth of 3,000 m. Laubiericoncha chuni possesses three monomeric globins, G1 (15,361 Da), G2 (15,668 Da), and G3 (15,682 Da) in circulating erythrocytes (Hb), and also three globins, G1, G3, and G4 (14,786 Da) in foot muscle (Mb). Therefore, globins G2 and G4 appear to be specific... |
| Tipo: Text |
|
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00245/35602/34150.pdf |
| |
|
|
| Decker, Carole; Morineaux, Marie; Van Gaever, Saskia; Caprais, Jean-claude; Lichtschlag, Anna; Gauthier, Olivier; Andersen, Ann C.; Olu, Karine. |
| Håkon Mosby mud volcano (HMMV) is one of the most active and most studied seep sites in European waters. Many authors have described its thermal activity, dynamic of mud flows, and geochemical and microbial processes. It is characterised by a concentric zonation of successive biogenic habitats related to an activity and geochemical gradient from its centre to its periphery. Around the central area covered by mud flows, white and grey microbial mats occur among areas of bare sediment, whereas siboglinid tubeworm fields of Sclerolinum contortum and/or Oligobrachia haakonmosbiensis colonise the peripheral areas. The meiofaunal community is known to be structured among habitats, but the macrofauna has rarely been investigated and has never been sampled in... |
| Tipo: Text |
Palavras-chave: Cold-seep; Community structure; Macrofauna; Norwegian margin; Polychaeta. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00074/18517/16130.pdf |
| |
|
|
| Decker, Carole; Olu, Karine. |
| The relative contribution of chemosynthesis in heterotrophic fauna at seeps is known to be influenced by depth and by habitat. Using stable isotopes of carbon and nitrogen, we investigated macro- and megafaunal nutritional patterns in Norwegian margin cold seeps by comparing food webs both among habitats within a seep site and between different sites. The very active Håkon Mosby mud volcano (HMMV) is characterized by geochemical gradients, microbial activity and faunal zonation from the centre to the periphery. The Storegga Slide (600–900 m depth) has pockmarks with patchy less active seeps, and also shows concentric zonation of habitats but at much smaller spatial scale. The dominant carbon source for macrofaunal nutrition in both areas was... |
| Tipo: Text |
Palavras-chave: Cold-seep; Macrofaunal nutrition; Methane-derived carbon; Norwegian margin; Stable isotope analysis. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00074/18518/16164.pdf |
| |
|
|
| Carlier, Antoine; Ritt, Benedicte; Rodrigues, Clara F.; Sarrazin, Jozee; Olu, Karine; Grall, Jacques; Clavier, Jacques. |
| Cold seep communities in the Mediterranean Sea have only been discovered two decades ago, and their trophic ecology has been the subject of very few studies. We investigated the benthic food web of two deep chemosynthesis-based ecosystems on the Napoli and Amsterdam mud volcanoes (MVs) in the eastern Mediterranean Sea (similar to 2,000 m depth). Seeping methane has been detected at the surface of both MVs during pioneering cruises and has been hypothesised to be assimilated by benthic fauna as observed in other oceans' margins. Given the extreme oligotrophic character of the eastern Mediterranean Sea, we a priori expected that chemosynthetic food sources, especially methane-derived carbon (MDC), played a major trophic role in these deep seep communities... |
| Tipo: Text |
Palavras-chave: Gulf of Mexico; Anaerobic methane oxidation; Stable isotope analysis; Sea hydrothermal vents; Food web structure; Kazan mud volcano; Florida escarpment; Trophic relationships; Benthic communauties; Lamellibrachia SP. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00016/12684/9633.pdf |
| |
|
|
| Teixeira, Sara; Olu, Karine; Decker, Carole; Cunha, Regina L.; Fuchs, Sandra; Hourdez, Stephane; Serrao, Ester A.; Arnaud-haond, Sophie. |
| Chemosynthetic ecosystems are distributed worldwide in fragmented habitats harbouring seemingly highly specialized communities. Yet, shared taxa have been reported from highly distant chemosynthetic communities. These habitats are distributed in distinct biogeographical regions, one of these being the so-called Atlantic Equatorial Belt (AEB). Here, we combined genetic data (COI) from several taxa to assess the possible existence of cryptic or synonymous species and to detect the possible occurrence of contemporary gene flow among populations of chemosynthetic species located on both sides of the Atlantic. Several Evolutionary Significant Units (ESUs) of Alvinocarididae shrimp and Vesicomyidae bivalves were found to be shared across seeps of the AEB. Some... |
| Tipo: Text |
Palavras-chave: Atlantic equatorial belt; Chemosynthetic habitats; Deep-sea connectivity; Endemic bivalves; Endemic shrimp; Genetic diversity; Microsatellite markers; Mitochondrial COI gene. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00157/26789/24950.pdf |
| |
|
|
| Girard, Fanny; Sarrazin, Jozee; Olu, Karine. |
| Cold seeps are widespread in the deep sea and, like other chemosynthesis-based ecosystems, often host high faunal biomass. Temporal changes at seeps have been inferred by comparing communities at different successional stages; nonetheless, temporal studies in seep ecosystems are rare. Using data collected as part of a benthic observatory, we characterized intra-annual microbial and faunal dynamics in a microbial mat habitat on the Håkon Mosby mud volcano (1256 m depth; Barents Sea), and evaluated the effects of a mud eruption on the biota. Video sequences recorded twice daily for 4.5 months with an autonomous imaging module were analyzed to quantify changes in microbial mat cover and megafaunal density and behavior. In addition, time series data for... |
| Tipo: Text |
Palavras-chave: Håkon Mosby Mud Volcano; LOOME; Arctic; Beggiatoa; Deep-sea observatories; Time series; Megafauna. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00624/73631/73069.pdf |
| |
|
|
| 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 |
| |
|
|
| Von Cosel, Rudo; Olu, Karine. |
| Two new genera and three new species of large Vesicomyidae are described from cold-seep sites on pockmarks and other sulfide-rich environments in the Gulf of Guinea (tropical east Atlantic) off Gabon, Congo (Brazzaville) and northern Angola, from 500 to 4000 m depth: "Catyptogena" (s.l.) regab n. sp., Wareniconcha (n.g.) guineensis (Thiele and Jaeckel 1931), Elenaconcha guiness n.g. n. sp., and Isorropodon atalantae n. sp. For two other species already taken by the R/V Valdivia in 1898, Calyptogena valdiviae (Thiele and Jaeckel 1931) and Isorropodon striatum (Thiele and Jaeckel 1931) new localities were discovered, and the species are rediscussed. E. guiness n.g. n.sp. is also recorded from off Banc d'Arguin, Mauritania, collected by commercial fishing... |
| Tipo: Text |
Palavras-chave: New Taxa; Systematics; Eastern Atlantic; Gulf of Guinea; Cold seeps; Vesicomyidae. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-7443.pdf |
| |
|
| |
| Registros recuperados: 58 | |
|
|
|
