|
|
|
| Registros recuperados: 60 | |
|
| |
|
|
| Storh, Sabine; Segonzac, Michel. |
| Prior to this study, two species of ophiuroid had been described from hydrothermal vent sites, and another from methane cold seeps, all from the Atlantic Ocean. Although ophiuroids have occasionally been reported from vents in the Pacific Ocean as well, none has been described before. This study presents two new species, Spinophiura jolliveti gen. et sp. nov., family Ophiuridae, and Ophiolamina eprae gen. et sp. nov., family Ophiacanthidae, which are most likely endemic to reducing environments in the East Pacific. We also include detailed descriptions of the post-metamorphic development of these species. Spinophiura jolliveti is characterized by up to five rather long, semi-erect arm spines and a relatively small oral shield. Its postlarva is unusual in... |
| Tipo: Text |
Palavras-chave: Cold seep; Hydrothermal vent; Taxonomy; Morphology; SEM; Ophiacanthidae; Ophiuridae; Postlarval development; Brittle stars. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-6475.pdf |
| |
|
|
| Shillito, B; Le Bris, Nadine; Hourdez, S; Ravaux, J; Cottin, D; Caprais, Jean-claude; Jollivet, D; Gaill, F. |
| The shrimp Mirocaris fortunata is a hydrothermal vent species that is found at most vent-sites along the Mid-Atlantic Ridge. This endemic species is found across a hydrothermal gradient, with thermal conditions ranging from 2-9 degrees C in ambient seawater to fairly warm values of about 25 degrees C. We performed in vivo experiments on M. fortunata specimens originating from different sites and depths (850 m to 2300 m), both at atmospheric pressure and in pressurized aquaria, to characterise the upper thermal limits of this species. Atmospheric pressure results show that thermal physiology should be studied at each population's native pressure. At in situ pressure, shrimps from Menez Gwen (850 m depth) and Lucky Strike (1700 m depth) do not survive... |
| Tipo: Text |
Palavras-chave: IPOCAMP TM; Crustacea; Mirocaris fortunata; Thermal stress; Hydrothermal vent. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1240.pdf |
| |
|
|
| Khripounoff, Alexis; Vangriesheim, Annick; Crassous, Philippe; Segonzac, Michel; Colaco, Ana; Desbruyeres, Daniel; Barthelemy, Roxane. |
| In order to provide information about the export and the distribution of hydrothermal particulate material to the surrounding deep ocean, four moorings were deployed in the vicinity of the hydrothermal Rainbow vent field (Mid-Atlantic Ridge, 36 degrees 14'N, 2250 m depth). The first mooring was a sediment trap with a current meter deployed at 2 m from a chimney of the Rainbow vent field and 1.5 m above the bottom (a.b.) for 16 days. It represented the reference for the initial composition of particles produced by the vent. The total mean mass particle flux (6.9 g m(-2) d(-1)) was distinctly higher than the flux measured at the shallower hydrothermal vents on the MAR segment. This particulate flux showed a high temporal variation at the scale of a few days... |
| Tipo: Text |
Palavras-chave: Zooplankton; Biochemistry; Geochemistry; Particle flux; Hydrothermal vent. |
| Ano: 2001 |
URL: https://archimer.ifremer.fr/doc/2001/publication-801.pdf |
| |
|
|
| Laes-huon, Agathe; Cathalot, Cecile; Legrand, Julien; Tanguy, Virginie; Sarradin, Pierre-marie. |
| A study of the temporal dynamics of iron concentrations and temperature on a faunal assemblage at the Lucky Strike vent was performed using the Tempo ecological module at the EMSO-Azores deep-sea observatory. The CHEMINI in situ analyzer was implemented on this structure to determine reactive iron concentrations in unfiltered seawater samples along with a temperature probe. Stability tests were performed on the CHEMINI analyzer before deployment (optical module, hyperbaric tests, and deep-sea calibration) for long-term in situ analysis of reactive iron (six months, 2013–2014) at the Tour Eiffel active edifice. Recorded daily, the in situ standard (25 \mu mol.L {}^{-1} ) showed excellent reproducibility (1.07%, n=522 ), confirming satisfactory analytical... |
| Tipo: Text |
Palavras-chave: Deep-sea observatory; Hydrothermal vent; In situ chemical analyzer; Iron; Monitoring the Mid-Atlantic Ridge (MoMAR). |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00342/45275/46432.pdf |
| |
|
|
| Le Bris, Nadine; Rodier, Philippe; Sarradin, Pierre-marie; Le Gall, Christian. |
| On the basis of previous studies at 9 degrees N and 13 degrees N East Pacific Rise (EPR) fields, we discuss the general assumption that temperature is a proxy for sulfide in vent fauna habitat. The main conclusion of these works is illustrated here through selected examples. In situ measurements were used to assess the variability of chemical parameters as function of temperature at the scale of fauna aggregations. Over a single vent site, aggregations of mussels or Riftia pachyptila discretely distributed around diffuse vents exhibit, in first assumption, similar sulfide-temperature correlation. In contrast, sulfide is much higher, for a given temperature, in the habitat of alvinellids than in neighboring habitats of Riftia pachyptila. Some consistency in... |
| Tipo: Text |
Palavras-chave: Alvinellids; Riftia pachyptila; Mussel beds; Temperature; Sulfide; Hydrothermal vent. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-3609.pdf |
| |
|
|
| Roussel, Erwan; Konn, Cecile; Charlou, Jean-luc; Donval, Jean-pierre; Fouquet, Yves; Querellou, Joel; Prieur, Daniel; Cambon-bonavita, Marie-anne. |
| The distribution of Archaea and methanogenic, methanotrophic and sulfate-reducing communities in three Atlantic ultramafic-hosted hydrothermal systems (Rainbow, Ashadze, Lost City) was compared using 16S rRNA gene and functional gene (mcrA, pmoA and dsrA) clone libraries. The overall archaeal community was diverse and heterogeneously distributed between the hydrothermal sites and the types of samples analyzed (seawater, hydrothermal fluid, chimney and sediment). The Lost City hydrothermal field, characterized by high alkaline warm fluids (pH>11; T<95 °C), harbored a singular archaeal diversity mostly composed of unaffiliated Methanosarcinales. The archaeal communities associated with the recently discovered Ashadze 1 site, one of the deepest active... |
| Tipo: Text |
Palavras-chave: Archaea; Hydrothermal vent; Mid-Atlantic Ridge; 16S rRNA gene; Sediment; Ultramafic. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00067/17836/15573.pdf |
| |
|
|
| Byrne, Nathalie; Strous, Marc; Crepeau, Valentin; Kartal, Boran; Birrien, Jean-louis; Schmid, Markus; Lesongeur, Francoise; Schouten, Stefan; Jaeschke, Andrea; Jetten, Mike; Prieur, Daniel; Godfroy, Anne. |
| Recent studies indicate that ammonia is an important electron donor for the oxidation of fixed nitrogen, both in the marine water column and sediments. This process, known as anammox, has so far only been observed in a large range of temperature habitats. The present study investigated the role of anammox in hydrothermal settings. During three oceanographic expeditions to the Mid-Atlantic Ridge, hydrothermal samples were collected from five vent sites, at depths ranging from 750 to 3650m from cold to hot habitats. Evidence for the occurrence of anammox in these particular habitats was demonstrated by concurrent surveys, including the amplification of 16S rRNA gene sequences related to known anammox bacteria, ladderanes lipids analysis and measurement of a... |
| Tipo: Text |
Palavras-chave: Hydrothermal vent; Ladderanes; 16S rRNA; Activity; Micro organisms; Anammox. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6921.pdf |
| |
|
|
| Gollner, Sabine; Zekely, Julia; Govenar, Breea; Le Bris, Nadine; Nemeschkal, Hans L.; Fisher, Charles R.; Bright, Monika. |
| The permanent meiobenthic community associated with aggregations of the tubeworm Riftia pachyptila was characterized at 2 different hydrothermal vent sites, Tica and Riftia Field, on the East Pacific Rise near 9 degrees 50'N. The maximum effluent temperatures were similar at both sites, but the chemistry of the hydrothermal fluids differed between sites. The abundance of meiobenthos was very low in 5 out of 6 samples (<61 ind. 10 cm(-2)) and was higher at Tica (20 to 976 ind. 10 cm(-2)) than at Riftia Field (< 1 to 12 ind. 10 cm(-2)). Meiobenthos abundance was positively correlated with the volume of sediment within the tubeworm aggregations. Sediment consisted mainly of particulate organic material and contained only a few mineral grains. A total of... |
| Tipo: Text |
Palavras-chave: Riftia pachyptila; Community study; Copepods; Nematodes; East Pacific Rise; Hydrothermal vent; Meiofauna; Meiobenthos. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2623.pdf |
| |
|
| |
|
|
| Burreson, Eugene; Segonzac, Michel. |
| The deep-sea fish leech Bathybdella sawyeri Burreson has recently been collected from two sites on the South East Pacific Rise at approximately 14 degrees and 17 degrees S, 2623 - 2586 m depth. Leeches were obtained from washings of vent mussels Bathymodiolus thermophilus (Mytilidae) and clams Calyptogena magnifica (Vesicomyidae) collected with a grab by a submersible, or were found attached to the cheliped of the crab Cyanagraea praedator (Bythograeidae) collected in baited traps at 14 S. Most individual leeches had morphology typical of B. sawyeri as originally described, with suckers of approximately equal size, but all specimens collected from the crab C. praedator had unusually large oral suckers that were distinctly larger than the caudal sucker.... |
| Tipo: Text |
Palavras-chave: Cyanagraea; Bythograeidae; Bathybdella; Hydrothermal vent; East Pacific Rise; Piscicolidae; Hirudinida. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-2049.pdf |
| |
|
|
| Roger, Olivier; Kervarec, Nelly; Ratiskol, Jacqueline; Colliec-jouault, Sylvia; Chevolot, Lionel. |
| The structure of the extracellular polysaccharide produced by the mesophilic species, Alteromonas infernus, found in deep-sea hydrothermal vents and grown under laboratory conditions, has been investigated using partial depolymerization, methylation analysis, mass spectrometry and NMR spectroscopy. The repeating units of this polysaccharide is a nonasaccharide with the following structure: [GRAPHICS] (C) 2004 Elsevier Ltd. All rights reserved. |
| Tipo: Text |
Palavras-chave: Hydrothermal vent; Structure; Bacterial polysaccharide; Alteromonas. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/publication-2112.pdf |
| |
|
| |
|
|
| Khripounoff, Alexis; Caprais, Jean-claude; Decker, Carole; Le Bruchec, J.; Noel, Philippe; Husson, Berengere. |
| We studied bivalves (vesicomyids and mytilids) inhabiting four different areas of high sulfide and methane production: 1) in the Gulf of Guinea, two pockmarks (650 m and 3150 m depth) and one site rich in organic sediments in the deepest zone (4950 m average depth), 2) at the Azores Triple Junction on the Mid-Atlantic Ridge, one hydrothermal site (Lucky Strike vent field, 1700 m depth). Two types of Calmar benthic chambers were deployed, either directly set into the sediment (standard Calmar chamber) or fitted with a tank to isolate organisms from the sediment (modified Calmar chamber), to assess gas and solute exchanges in relation to bivalve bed metabolism. Fluxes of oxygen, total carbon dioxide, ammonium and methane were measured. At the site with... |
| Tipo: Text |
Palavras-chave: Deep-sea; Benthic chamber; Vesicomyid and Mytilid bivalves; Respiration rate; Cold seep; Hydrothermal vent. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00341/45204/44614.pdf |
| |
|
| |
|
|
| Cuvelier, Daphne; Sarradin, Pierre-marie; Sarrazin, Jozee; Colaco, Ana; Copley, Jon T.; Desbruyeres, Daniel; Glover, Adrian G.; Santos, Ricardo Serrao; Tyler, Paul A.. |
| The Eiffel Tower edifice is situated in the Lucky Strike hydrothermal vent field at a mean depth of 1690 m on the Mid-Atlantic Ridge (MAR). At this 11-m-high hydrothermal structure, different faunal assemblages, varying in visibly dominant species (mussels and shrimp), in mussel size and in density of mussel coverage, were sampled biologically and chemically. Temperature and sulphide (Sigma S) were measured on the different types of mussel-based assemblages and on a shrimp-dominated assemblage. Temperature was used as a proxy for calculating total concentrations of CH4. Based on the physico-chemical measurements, two microhabitats were identified, corresponding to (i) a more variable habitat featuring the greatest fluctuations in environmental variables... |
| Tipo: Text |
Palavras-chave: Faunal assemblage; Hydrothermal vent; Microhabitat; Mid-Atlantic Ridge; Physico-chemical characterisation. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00035/14648/13996.pdf |
| |
|
|
| Pradillon, F; Le Bris, Nadine; Shillito, B; Young, C; Gaill, F. |
| Dispersal and colonisation processes at deep-sea vents are still not fully understood, essentially because early life stages of vent species remain unknown. The polychaete worm Alvinella pompejana forms colonies on chimney walls at East Pacific Rise vent sites where the temperature can frequently exceed 20 degrees C. In vitro studies in pressure vessels showed that the early embryos tolerate temperatures in a lower range (10-14 degrees C), suggesting that they would have to escape the colony to develop. Pressure vessels offer the advantage that each parameter can be independently controlled, but they do not simulate the more complex and dynamic conditions naturally encountered at vent sites. Accordingly, in addition to incubations in pressure vessels, we... |
| Tipo: Text |
Palavras-chave: Environmental condition; H2S; Temperature tolerance; Polychaete; Pressure vessel; Embryo; Development; Hydrothermal vent. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-600.pdf |
| |
|
|
| Alain, Karine. |
| Cultural and molecular approaches were used to analyse the microbial assemblages associated to the deep-sea hydrothermal vent polychaete worms of the family Alvinellidae. In a first part of the work, the populations associated to three alvinellid species from the Juan de Fuca Ridge (Paralvinella palmiformis, Paralvinella pandorae and Paralvinella sulfincola) were identified by phylogenetic analyses. A wide microbial diversity was detected, like a great number of new sequences or of sequences belonging to species previously unidentified at deep-sea hydrothermal vents. All the libraries were found to be dominated by sequences affiliated to the epsilon-Proteobacteria. In other respects, fermentative micro-organisms belonging to the Thermococcales, the... |
| Tipo: Text |
Palavras-chave: Paralvinella; Alvinella; 16S rRNA; Thermophile; Hydrothermal vent; Paralvinella; Alvinella; ARNr 16S; Thermophile; Source hydrothermale. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/2005/these-332.pdf |
| |
|
| |
|
|
| Bettencourt, R; Dando, P; Rosa, D; Riou, V; Colaco, A; Sarrazin, Jozee; Sarradin, Pierre-marie; Santos, R. |
| The deep-sea hydrothermal vent mussel Bathymodiolus azoricus has been the subject of several studies aimed at understanding the physiological adaptations that vent animals have developed in order to cope with the particular physical and chemical conditions of hydrothermal environments. In spite of reports describing successful procedures to maintain vent mussels under laboratory conditions at atmospheric pressure, few studies have described the mussel's physiological state after a long period in aquaria. In the present study, we investigate changes in mucocytes and hemocytes in B. azoricus over the course of several months after deep-sea retrieval. The visualization of granules of mucopolysaccharide or glycoprotein was made possible through their inherent... |
| Tipo: Text |
Palavras-chave: Vent; Hydrothermal vent; Bathymodiolus azoricus; Aquarium acclimatization; Phagocytosis; Alcian blue Periodic Acid Schiff staining; Mucopolysaccharide. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4357.pdf |
| |
| Registros recuperados: 60 | |
|
|
|
