Consulta: subjectFacets:"Hydrothermal vent"
Registros recuperados: 60
Data/hora: 06/06/2024 06:00:14

Morphological variability of Bathybdella sawyeri (Hirudinida : Piscicolidae) from hydrothermal vents on the Galapagos Rift and the South East Pacific Rise
Provedor de dados: 5
Autores: 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

Hydrothermal faunal assemblages and habitat characterisation at the Eiffel Tower edifice (Lucky Strike, Mid-Atlantic Ridge)
Provedor de dados: 5
Autores: 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

Approches culturales et moléculaires des assemblages microbiens associés aux polychètes hydrothermaux de la famille Alvinellidae
Provedor de dados: 5
Autores: 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

Mosaic community dynamics on Juan de Fuca Ridge sulphide edifices: substratum, temperature and implications for trophic structure
Provedor de dados: 5
Autores: Sarrazin, Jozee; Levesque, Christian; Juniper, S; Tivey, Margaret.
Introduction : Ecological studies at hydrothermal vents often emphasize the importance of spatio-temporal heterogeneity in organism distribution within individual sites (Sarrazin et al., 1997) but the relative roles of environmental conditions, biological interactions and/or random processes in structuring hydrothermal communities remain poorly understood (Sarrazin &amp; Juniper, 1999). A model of community succession developed by Sarrazin et al. (1997, 1999) proposed that a series of faunal assemblages form a mosaic community that colonizes hydrothermal edifices of the northeast Pacific vents. This paper further develops the succession model by incorporating new observations. At the core of the model is the recognition of distinct faunal assemblages that...
Tipo: Text
Palavras-chave: Model; Environmental conditions; North east Pacific; North east Pacific; Hydrothermal vent.
Ano: 2002
URL: https://archimer.ifremer.fr/doc/2002/publication-893.pdf

First record of the deep-sea eel Ilyophis saldanhai (Synaphobranchidae, Anguilliformes) from the Pacific Ocean
Provedor de dados: 5
Autores: Causse, Romain; Biscoito, M; Briand, Patrick.
First record of the deep-sea eel Ilyophis saldanhai (Synaphobranchidae, Anguilliformes) from the Pacific Ocean.
Tipo: Text
Palavras-chave: New record; Hydrothermal vent; South East Pacific Ridge; PSE; Ilyophis saldanhai; Synaphobranchidae.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-1117.pdf

Presence and activity of anaerobic ammonium-oxidizing bacteria at deep-sea hydrothermal vents
Provedor de dados: 5
Autores: 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

Fishes from the hydrothermal vents and cold seeps - An update
Provedor de dados: 5
Autores: Biscoito, Manuel; Segonzac, Michel; Almeida, Armando; Desbruyeres, Daniel; Geistdoerfer, Patrick; Turnipseed, Mary; Van Dover, Cindy.
Introduction : Since the discovery of animal communities in oceanic hydrothermal vents in 1977 and in deep-sea cold seeps in 1984 (Londsdale, 1977; Paull et al., 1984) fishes have been regularly observed in association with these chemosynthetically-driven communities, but in most cases they are difficult to catch and therefore species identification can only rely on images taken by the diving vehicles. Ichthyological information pertaining to species inhabiting the deep-sea hydrothermal vents and cold seeps is mentioned in over 30 papers and even in the more detailed and updated lists (Geistdoerfer, 1991; 1996; 1999; Sibuet &amp; Olu, 1998; Tunnicliffe, 1991) there are species missing. The situation is even less clear concerning the bathyal species...
Tipo: Text
Palavras-chave: Fishes; Species identification; Hydrothermal vent.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-896.pdf

A new deep-sea lobster of the genus Thymopides (Crustacea : Decapoda : Nephropidae) collected near the hydrothermal vent Snake Pit, Mid-Atlantic Ridge
Provedor de dados: 5
Autores: Segonzac, Michel; Macpherson, Enrique.
A second species of the genus Thymopides, T laurentae sp. nov., is described from a specimen trapped at 3505 m depth in the Mid-Atlantic Ridge, near the Snake Pit hydrothermal area. This new species is easily distinguishable from the type species T grobovi, collected off the subantarctic islands Heard and Kerguelen, at depth between 525 and 1220 m, by its smooth carapace, the abdomen without longitudinal median carina and the palm of the first pereopod distinctly longer than wide.
Tipo: Text
Palavras-chave: Mid Atlantic Ridge; Hydrothermal vent; Deep sea; Nephropidae; Thymopides.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/publication-888.pdf

A new species of scale-worm (Polychaeta : Polynoidae), Lepidonotopodium jouinae sp nov., from the Azores Triple Junction on the Mid-Atlantic Ridge
Provedor de dados: 5
Autores: Desbruyeres, Daniel; Hourdez, Stéphane.
A new species of scale-worm, Lepidonotopodium jouinae, belonging to the sub-family Lepidonotopodinae (Polychaeta: Polynoidae) has been found in samples collected on deep-sea hydrothermal vent fields at the Azores Triple Junction on the Mid-Atlantic Ridge. It is the first species of Polynoidae described from the Mid-Atlantic Ridge hydrothermal vents. Other species of the same genus have been described from hydrothermal vents of the Pacific Ocean.
Tipo: Text
Palavras-chave: Mid Atlantic Ridge; Hydrothermal vent; Deep sea; Polynoidae; Polychaeta; Annelida.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-892.pdf

Mode de reconnaissance hôte symbionte en milieux extrêmes : cas du modèle symbiotique Rimicaris exoculata
Provedor de dados: 5
Autores: Le Bloa, Simon.
Deprived of light, the deep-sea hydrothermal vents are extremes ecosystems sustained by micobial chemosynthesis. These environments are colonized by animal species living in close relationships with these chemoautotrophic micro-organisms, eating them or establishing long term interactions with them, may they be trophic or not only. The shrimp Rimicaris exoculata is an endemic hydrothermal species of the Mid-Atlantic Ridge (MAR) sites. This crustacean represents the predominant macrofauna of some sites of the MAR. It lives in symbiotic association with two distinct microbial communities qualified as ectosymbiosis. One is located in its gill chamber and one in its gut. First, this work focused on the study of bacterial communication (Quorum Sensing or QS)...
Tipo: Text
Palavras-chave: Écosystèmes hydrothermaux; Peptide antimicrobien; Marqueurs génétiques; Hydrothermal vent; Rimicaris exoculata; Symbiose; Quorum Sensing; Antimicrobial peptide; Genetic marker.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00498/60918/64279.pdf

Out of the deep-sea into a land-based aquarium environment: Investigating innate immunity in the hydrothermal vent mussel Bathymodiolus azoricus
Provedor de dados: 5
Autores: Bettencourt, Raul; Costa, Valentina; Laranjo, Mario; Rosa, Domitilia; Pires, Luis; Colaco, Ana; Sarradin, Pierre Marie; Lopes, Humberto; Sarrazin, Marie Josée; Santos, Ricardo Serrao.
Deep-sea hydrothermal vents are considered as some of the most adverse environments in the world, yet the animals dwelling around the vent sites exhibit high productivity and therefore must cope with unusual levels of heavy metals, pH, temperature, CO2 and sulfide, in addition to environmental microbes. In an attempt to understand the physiological reactions of animals normally set to endure extreme conditions we investigated molecular indicators of acclimation processes during which the mussel Bathymodiolus azoricus was maintained over long periods of time under without methane and/or sulfide supplementation, vent mussels seem to endure well aquarium conditions. The presence and induction of a Rel Homology Domain containing gene was investigated along...
Tipo: Text
Palavras-chave: Bathymodiolus azoricus; Innate immunity; Gene expression; IPOCAMP; Physiological adaptation; Hydrothermal vent.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00019/13042/10154.pdf

Epifaunal community structure associated with Riftia pachyptila aggregations in chemically different hydrothermal vent habitats
Provedor de dados: 5
Autores: Govenar, B; Le Bris, Nadine; Gollner, S; Glanville, J; Aperghis, A; Hourdez, S; Fisher, C.
The vestimentiferan tubeworm Riftia pachyptila (Polychaeta: Sibloglinidae) often dominates early succession stages and high productivity habitats at low-temperature hydrothermal vents on the East Pacific Rise. We collected 8 aggregations of R. pachyptila and the associated epifaunal community at 2 discrete sites of diffuse hydrothermal activity, in December 2001 and December 2002. Because of the high spatial and temporal variability of the biotic and abiotic factors related to hydrothermal vent activity, significant differences in the structure and the composition of the community were expected to occur at the scale of either 1 yr or 500 m distance between very different sites. There was no significant difference in the temperature ranges of the diffuse...
Tipo: Text
Palavras-chave: Benthos; Epifauna; Community structure; Riftia pachyptila; East Pacific Rise; Hydrothermal vent.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-3617.pdf

Is temperature a good proxy for sulfide in hydrothermal vent habitats?
Provedor de dados: 5
Autores: 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

Relationship between metal levels in the vent mussel Bathymodiolus azoricus and local microhabitat chemical characteristics of Eiffel Tower (Lucky Strike)
Provedor de dados: 5
Autores: Martins, Ines; Cosson, Richard P.; Riou, Virginie; Sarradin, Pierre-marie; Sarrazin, Jozee; Santos, Ricardo S.; Colaco, Ana.
The turbulent mixing of hydrothermal hot fluid with cold seawater creates large chemical gradients at a small spatial scale that may induce variable physiological and biochemical adaptations within the vent fauna. The adaptation to such a variable environment by the vent mussel Bathymodiolus azoricus relies on a dual symbiosis hosted in the gills, and digestion of particulate organic matter. The surrounding environment not only provides the necessary energy sources and suspended organic particles for the vent mussel nutrition, but also potentially toxic compounds such as metals. Our main goal was to see if there is a relation between metal accumulation in mussel organs and the chemical characteristics of their close environment. Mussels were collected at...
Tipo: Text
Palavras-chave: Metals; Metallothioneins; Bathymodiolus azoricus; Hydrothermal vent; Environmental conditions; Physiological condition; Spatial distribution.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00030/14097/11327.pdf

Desulfurobacterium indicum sp nov., a thermophilic sulfur-reducing bacterium from the Indian Ocean
Provedor de dados: 5
Autores: Cao, Junwei; Birien, Tiphaine; Gayet, Nicolas; Huang, Zhaobin; Shao, Zongze; Jebbar, Mohamed; Alain, Karine.
A novel sulfur-reducing bacterium, strain K6013(T), was isolated from a sulfide sample collected at a depth of 2771 m from a high-temperature hydrothermal vent in the Indian Ocean. Cells were Gram-stain-negative, anaerobic, motile rods (0.92.2 x 0.4-0.6 mu m). The strain grew at NaCl concentrations ranging from 1 to 4.5% (w/v) (optimum 2.5 %), at pH 5 to 8 (optimum pH 6), and at temperatures between 40 and 75 degrees C (optimum 65 degrees C). K6013(T) was an obligate chemolithoautotroph, using thiosulfate, sulfur and nitrate as terminal electron acceptors in the presence of H-2 but not sulfate, sulfite nor nitrite. The major cellular fatty acids were C-16 : 0 (17.4 %), C-18 : 1 omega 7c/C-18 : 1 omega 6c (ummed feature 8, 37.91 %), C-18 : 0 (18.29 %) and...
Tipo: Text
Palavras-chave: Desulfurobacterium; Thermophilic; Hydrothermal vent; Chemolithoautotroph; Sulfur-reducer.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00395/50637/53724.pdf

Community dynamics over a decadal scale at Logatchev, 14 degrees 45 ' N, Mid-Atlantic Ridge
Provedor de dados: 5
Autores: Gebruk, Andrey; Fabri, Marie-claire; Briand, Patrick; Desbruyeres, Daniel.
Hydrothermal vent community dynamics over a ten year span was studied in the Logatchev area, 14 degrees 45'N on the Mid-Atlantic Ridge. On the SERPENTINE cruise in March 2007 with the RN Pourquoi pas? and the ROV Victor 6000 (IFREMER), composition, abundance and distribution of dominant megafauna at Logatchev were examined and compared to published data from 1997. Our results revealed notable changes in several community characteristics. The most significant changes evident in March 2007 compared to July 1997 were the increase up to by order of magnitude in the population density of predatory gastropods Phymorchynchus spp. at the site Irina-2 and disappearance of a live population of vesicomyids at the site Anya's Garden. Other notable differences between...
Tipo: Text
Palavras-chave: Hydrothermal vent; Community dynamics; Succession; Phymorchynchus; Bathymodiolus puteoserpentis; Vesicomyids; Logatchev; Mid-Atlantic Ridge.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00019/13044/10156.pdf

A new species of scale-worm (Polychaeta : Polynoidae), Lepidonotopodium atalantae sp nov., from the East Pacific Rise at 13 degrees N and 9 degrees 50'N
Provedor de dados: 5
Autores: Desbruyeres, Daniel; Hourdez, Stéphane.
A new species of scale-worm, Lepidonotopodium atalantae, belonging to the sub-family Lepidonotopodinae (Polychaeta: Polynoidae) has been found in samples collected on the deep-sea hydrothermal vent sites of 9 degrees N and 13 degrees N on the East Pacific Rise. It is mainly characterized by elytra, regularly ornamented on their posterior border, and very long anal cirri. This is the fifth species of Lepidonotopodium, all belonging to the deep-sea hydrothermal vent fauna.
Tipo: Text
Palavras-chave: East Pacific Rise; Hydrothermal vent; Deep sea; Polynoidae; Polychaeta; Annelida.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-891.pdf

Structural studies of the main exopolysaccharide produced by the deep-sea bacterium Alteromonas infernus
Provedor de dados: 5
Autores: 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

Complete genome sequence and whole-genome phylogeny of Kosmotoga pacifica type strain SLHLJ1T from an East Pacific hydrothermal sediment
Provedor de dados: 5
Autores: Jiang, Lijing; L'Haridon, Stephane; Jebbar, Mohamed; Xu, Hongxiu; Alain, Karine; Shao, Zongze.
Kosmotoga pacifica strain SLHLJ1T is a thermophilic chemoorganoheterotrophic bacterium isolated from a deep-sea hydrothermal sediment. It belongs to the physiologically homogeneous Thermotogaceae family. Here, we describe the phenotypic features of K. pacifica together with its genome sequence and annotation. The chromosome has 2,169,170 bp, organized in one contig. A total of 1897 candidate protein-encoding genes and 177 RNA genes were identified. The 16S rRNA gene sequence of this strain is distantly related to sequences of some relatives classified in the same genus (K. olearia 7.02% and K. shengliensis 7.83%), with dissimilarity percentages close to the threshold generally described for genus delineation. Nevertheless, the percentage of conserved...
Tipo: Text
Palavras-chave: Marine; Hydrothermal vent; Thermotogales; Chemoorganoheterotroph; Thermophile.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00371/48191/48324.pdf

Prolonged recovery time after eruptive disturbance of a deep-sea hydrothermal vent community
Provedor de dados: 5
Autores: Mullineaux, L. S.; Mills, S. W.; Le Bris, N.; Beaulieu, S. E.; Sievert, S. M.; Dykman, L. N.
Deep-sea hydrothermal vents are associated with seafloor tectonic and magmatic activity, and the communities living there are subject to disturbance. Eruptions can be frequent and catastrophic, raising questions about how these communities persist and maintain regional biodiversity. Prior studies of frequently disturbed vents have led to suggestions that faunal recovery can occur within 2–4 years. We use an unprecedented long-term (11-year) series of colonization data following a catastrophic 2006 seafloor eruption on the East Pacific Rise to show that faunal successional changes continue beyond a decade following the disturbance. Species composition at nine months post-eruption was conspicuously different than the pre-eruption ‘baseline' state, which had...
Tipo: Text
Palavras-chave: Succession; Hydrothermal vent; Disturbance; Resilience; Seafloor eruption; Colonization.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00665/77686/79757.pdf

Expanding the distribution of the Aquificales to the deep-sea vents on Mid-Atlantic Ridge and Central Indian Ridge
Provedor de dados: 5
Autores: Reysenbach, Anna-louise; Gotz, Dorothée; Banta, Amy; Jeanthon, Christian; Fouquet, Yves.
Introduction : Recently, the use of culture-independent molecular phylogenetic techniques has greatly increased our inventory of archaeal and bacterial diversity at deep-sea vents (e.g. Harmsen et al., 1997; Reysenbach et al., 2000; Takai et al., 2001) and several of the lineages appear to be endemic to deep-sea vents (Reysenbach et al., 2000b; Takai et al, 2000; Longnecker &amp; Reysenbach, 2001). Using environmental data, some of these lineages have now been cultivated (L'Haridon et al., 1998; Campbell et al., 2001). For example, until recently, the chemolithoautotrophic and thermophilic bacterial lineage, the Aquificales, was restricted to shallow marine vents and terrestrial thermal springs. However, as part of two independent studies, one in...
Tipo: Text
Palavras-chave: Phylogeny; Aquificales; Hydrothermal vent; Deep sea.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-894.pdf

Female description of the hydrothermal vent cephalopod Vulcanoctopus hydrothermalis
Provedor de dados: 5
Autores: Gonzalez, A; Guerra, A; Pascual, S; Segonzac, Michel.
During biological sampling of hydrothermal vents on the East Pacific Rise, the manned submersible 'Nautile' caught the first female of the endemic cephalopod Vulcanoctopus hydrothermalis. The specimen caught at the vent site Gromit (21 degrees 33 66'S, 114 degrees 17 98'W at 2832 m depth) is described here in detail and an amended diagnosis of the species proposed. The external morphology, measurements and internal structure resemble that Of males of this species. One of the most remarkable characters is the lack of spermathecae and the absence of apical filaments in the oocytes to provide a site for sperm storage. It is suggested that some species of the genera Benthoctopus and Bathypolypus would be the most suitable octopod ancestor of V. hydrothermalis.
Tipo: Text
Palavras-chave: Female description; Vulcanoctopus hydrothermalis; Cephalopods; Hydrothermal vent.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4044.pdf

Behavioural observations of the cephalopod Vulcanoctopus hydrothermalis
Provedor de dados: 5
Autores: Rocha, Francisco; Gonzalez, Angel; Segonzac, Michel; Guerra, Angel.
Introduction : The hydrothermal vent ecosystem is inhabited by poorly known species of deep-sea octopuses (Lutz &amp; Voight, 1994). Vulcanoctopus hydrothermalis Gonzalez &amp; Guerra, 1998, is the only described cephalopod from a hydrothermal vent (Gonzalez et al., 1998). Little is known about this small benthic octopus, up to 35 mm mantle length, with a muscular and semi-translucent body, lack of any type of chromatic elements in the skin and eye with no trace of an iris (Gonzalez et al., 1998). Its morphology was studied by Gonzalez et al. (in press) but there have been no behavioural studies of this species to date. Most observations of octopus behaviour in abyssal environments, mainly Cirroctopoda, have been described from videotape records (Boletzky...
Tipo: Text
Palavras-chave: Vulcanoctopus hydrothermalis; Behaviour; Cephalopod; Hydrothermal vent.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-897.pdf

Nematode communities associated with tubeworm and mussel aggregations on the East Pacific Rise
Provedor de dados: 5
Autores: Zekely, J; Gollner, S; Van Dover, C; Govenar, B; Le Bris, Nadine; Nemeschkal, H; Bright, M.
The meiobenthic nematode community of three different vent sites at the East Pacific Rise was studied in order to determine whether the abundance, species richness, diversity and trophic structure were similar. The sites Tica and Riftia Field were dominated by the tubeworm, Riftia pachyptila, and the Buckfield site was dominated by the mussel Bathymodiolus thermophilus. The nematode communities of all three sites were low in abundance (&lt; 1 up to 46 ind. 10 cm(-2)), except one sample from Tica with almost 1000 ind. 10 cm(-2). The communities at all sites consisted entirely of primary consumers, mostly deposit feeders. Species richness and Shannon-Wiener diversity indices were low and similar at both tubeworm sites and slightly but significantly higher at...
Tipo: Text
Palavras-chave: East Pacific Rise; Bathymodiolus thermophilus; Riftia pachyptila; Nematodes; Meiobenthos; Hydrothermal vent.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-3608.pdf

Spatial and temporal variations in food web structure from newly-opened habitat at hydrothermal vents
Provedor de dados: 5
Autores: Gaudron, Sylvie Marylene; Lefebvre, Sebastien; Jorge, Amandine Nunes; Gaill, Francoise; Pradillon, Florence.
To highlight the spatio-temporal variability of the food web structure of hydrothermal vent fauna from newly-opened habitat, a series of Titanium Ring for Alvinellid Colonization devices (TRACs) was deployed at TICA site on the East Pacific Rise in 2006. This experiment was conducted for periods of 4 days, 13 days and one month and deployments were aligned along a gradient from the basaltic bottom to the vent openings. delta C-13 values of colonists revealed a narrower range of carbon sources in proximity to vent openings in Alvinella pompejana habitat than in Tevnia jerichonana habitat, separated by a distance of four meters. This was possibly due to a spatial change in available food sources with a possible higher contribution of particulate organic...
Tipo: Text
Palavras-chave: Trophic relationships; Food web structure; Hydrothermal vent; East Pacific Rise; Stable isotopes; Colonization experiment; TRACs; Alvinella pompejana; Epibiosis.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00085/19580/19581.pdf

Influence of environmental conditions on early development of the hydrothermal vent polychaete Alvinella pompejana
Provedor de dados: 5
Autores: 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

Two new species of spionidae (Annelida : polychaeta) from Mid-Atlantic ridge hydrothermal vents
Provedor de dados: 5
Autores: Sigvaldadottir, Elin; Desbruyeres, Daniel.
Two new species of polychaetous annelids Prionospio unilamellata sp. nov. and Laonice asaccata sp. nov. (Spionidae) are described from samples collected at Mid-Atlantic hydrothermal vent fields close to the Azores Triple Junction and in the Snake Pit vent field. These two species are important components of the communities associated with active venting. Prionospio unilamellata differs from all other Prionospio species in the form of anterior notopodial lamellae. Laonice asaccata differs from other Laonice species by lacking interparapodial pouches.
Tipo: Text
Palavras-chave: Identification; Prionospio unilamellata; Spionidae; Deep sea; Hydrothermal vent.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/publication-889.pdf

Temperature resistance studies on the deep-sea vent shrimp Mirocaris fortunata
Provedor de dados: 5
Autores: 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

Understanding the biogeography of chemosynthetic ecosystems
Provedor de dados: 5
Autores: Tyler, Pa; German, Cr; Ramirez-llodra, E; Van Dover, Cl.
ChEss is a recently-funded Census of marine life programme aimed at improving our knowledge of the biogeography of deepwater chemosynthetically driven ecosystems by promoting an international field phase of discovery and exploration. The main objectives are to assess and explain the diversity, distribution and abundance of hydrothermal vent and cold seep species. With the global mid-ocean ridge system extending similar to65000 km, it is unlikely that its entire length would be examined in detail. The ChEss programme proposes to select a limited number of target areas chosen for the discovery of new vents and seeps. The intention is to identify the maximum scientific return that could be achieved from detailed investigation of the minimum number of sites at...
Tipo: Text
Palavras-chave: Biogéographie; Écosystème chémosynthétique; Évent hydrothermal; Suintement froid; Biogeography; Chemosynthetic ecosystems; Hydrothermal vent; Cold seep.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00322/43306/43042.pdf

Comparison of microbial communities associated with three Atlantic ultramafic hydrothermal systems
Provedor de dados: 5
Autores: 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&gt;11; T&lt;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

Thermococcus piezophilus sp. nov., a novel hyperthermophilic and piezophilic archaeon with a broad pressure range for growth, isolated from a deepest hydrothermal vent at the Mid-Cayman Rise
Provedor de dados: 5
Autores: Dalmasso, Cecile; Oger, Philippe; Selva, Gwendoline; Courtine, Damien; L'Haridon, Stephane; Garlaschelli, Alexandre; Roussel, Erwan; Miyazaki, Junichi; Reveillaud, Julie; Jebbar, Mohamed; Takai, Ken; Maignien, Lois; Alain, Karine.
A novel strictly anaerobic, hyperthermophilic archaeon, designated strain CDGST, was isolated from a deep-sea hydrothermal vent in the Cayman Trough at 4964 m water depth. The novel isolate is obligate anaerobe and grows chemoorganoheterotrophically with stimulation of growth by sulphur containing compounds. Its growth is optimal at 75 °C, pH 6.0 and under a pressure of 50 MPa. It possesses the broadest hydrostatic pressure range for growth that has ever been described for a microorganism. Its genomic DNA G + C content is 51.11 mol%. The novel isolate belongs to the genus Thermococcus. Phylogenetic analyses indicated that it is most closely related to Thermococcus barossii DSM17882T based on its 16S rRNA gene sequence, and to ‘Thermococcus onnurineus’ NA1...
Tipo: Text
Palavras-chave: Thermococcus; Piezophile; Hydrothermal vent; Cayman Trough.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00348/45949/45655.pdf

A comparison of in situ vs. ex situ filtration methods on the assessment of dissolved and particulate metals at hydrothermal vents
Provedor de dados: 5
Autores: Cotte, Laura; Waeles, Mathieu; Pernet-coudrier, Benoit; Sarradin, Pierre-marie; Cathalot, Cecile; Riso, Ricardo D.
The objective of this study was to assess the impact of the filtration method (in situ vs. ex situ) on the dissolved/particulate partitioning of 12 elements in hydrothermal samples collected from the Lucky Strike vent field (Mid-Atlantic Ridge; MAR). To do so, dissolved ( &lt;0.45 mu m) and particulate Mg, Li, Mn, U, V, As, Ba, Fe, Zn, Cd, Pb and Cu were measured using different techniques (HR-ICP-MS, ICP-AES and CCSA). Using in situ filtration as a baseline, we showed that ex situ filtration (on-board and on shore after freezing) resulted in an underestimation of the dissolved pool, which was counterbalanced by an overestimation of the particulate pool for almost all the elements studied. We also showed that on-board filtration was acceptable for the...
Tipo: Text
Palavras-chave: Metal; Hydrothermal vent; Dissolved; Particulate; Filtration method.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00298/40970/42656.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

The hydrothermal vent community of a new deep-sea field, Ashadze-1, 12°58'N on the Mid-Atlantic Ridge
Provedor de dados: 5
Autores: Fabri, Marie-claire; Bargain, Annaelle; Briand, Patrick; Gebruk, A.; Fouquet, Yves; Morineaux, Marie; Desbruyeres, Daniel.
Ashadze-1 (128 580N 448 510W, 4080 m) on the Mid-Atlantic Ridge (MAR) is the deepest known ctive hydrothermal vent ield. The first observations on this site were numerous clear and black smokers and surprisingly few nown symbiotic species ominant in other vent areas on the MAR. The species most abundant at Ashadze-1 are those usually ound at the periphery f hydrothermal communities: sea-anemones Maractis rimicarivora and chaetopterid polychaetes hyllochaetopterus sp. ov. This study comprised site mapping and faunal sampling and Ashadze-1 was completely mapped y using the Remote perated Vehicle ‘Victor 6000’ and a new high resolution tool available for deep-sea research. A photo-mapping survey was carried out with a long range optical black and white...
Tipo: Text
Palavras-chave: Hydrothermal vent; Mid-Atlantic Ridge; Maractis rimicarivora; Isotopes.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00004/11565/11356.pdf

Particle flux in the Rainbow hydrothermal vent field (Mid-Atlantic Ridge): Dynamics, mineral and biological composition
Provedor de dados: 5
Autores: 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

Phylogenetic characterization of the bacterial assemblage associated with mucous. secretions of the hydrothermal vent polychaete Paralvinella palmiformis
Provedor de dados: 5
Autores: Alain, Karine; Olagnon, Michel; Desbruyeres, Daniel; Page, Antoine; Barbier, Georges; Juniper, Kim; Querellou, Joel; Cambon-bonavita, Marie-anne.
As part of an ongoing examination of microbial diversity associated with hydrothermal vent polychaetes of the family Alvinellidae, we undertook a culture-independent molecular analysis of the bacterial assemblage associated with mucous secretions of the Northeastern Pacific vent polychaete Paralvinella palmiformis. Using a molecular 16S rDNA-based phylogenetic approach, clone libraries were constructed from two samples collected from active sulfide edifices in two hydrothermal vent fields. In both cases, clone libraries were largely dominated by epsilon-Proteobacteria. Phylotypes belonging to the Cytophaga-Flavobacteria and to the Verrucomicrobia were also largely represented within the libraries. The remaining sequences were related to the taxonomic...
Tipo: Text
Palavras-chave: Proteobacteria; 16S rRNA; Microbial diversity; Phylogeny; Hydrothermal vent; Paralvinella palmiformis.
Ano: 2002
URL: https://archimer.ifremer.fr/doc/2002/publication-661.pdf

A dual sensor device to estimate fluid flow velocity at diffuse hydrothermal vents
Provedor de dados: 5
Autores: Sarrazin, Jozee; Rodier, Philippe; Tivey, M. K.; Singh, H.; Schultz, A.; Sarradin, Pierre-marie.
Numerous attempts have been made over the last thirty years to estimate fluid flow rates at hydrothermal vents, either at the exit of black smoker chimneys or within diffuse flow areas. In this study, we combine two methods to accurately estimate fluid flow velocities at diffuse flow areas. While the first method uses a hot film anemometer that performs high-frequency measurements, the second allows a relatively rapid assessment of fluid flow velocity through video imagery and provides in situ data to calibrate the sensor. Measurements of flow velocities on hydrothermal diffuse flow areas were obtained on the Mid-Atlantic Ridge (MAR). They range from 1.1 to 4.9 mm/s at the substratum level, in low-temperature (4.5-16.4 degrees C) diffuse flow areas from...
Tipo: Text
Palavras-chave: Diffuse flow; Video imagery; Hot film anemometer; Hydrothermal vent; Fluid flow velocity.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-7299.pdf

Po-210 and Pb-210 in the tissues of the deep-sea hydrothermal vent mussel Bathymodiolus azoricus from the Menez Gwen field (Mid-Atlantic Ridge)
Provedor de dados: 5
Autores: Charmasson, Sabine; Le Faouder, Antoine; Loyen, Jeanne; Cosson, Richard P.; Sarradin, Pierre-marie.
The hydrothermal deep-sea vent fauna is naturally exposed to a highly specific environment enriched in potentially toxic species such as sulfides, metals and natural radionuclides due to the convective seawater circulation inside the oceanic crust and its interaction with basaltic or ultramafic host rocks. However, data on radionuclides in biota from such environment are very limited. An investigation was carried out on tissue partitioning of Po-210 and Pb-210, two natural radionuclides within the U-238 decay chain, in Bathymodiolus azoricus specimens from the Mid-Atlantic Ridge (Menez Gwen field). These two elements showed different distributions with high Pb-210 levels in gills and high Po-210 levels in both gills and especially in the remaining parts of...
Tipo: Text
Palavras-chave: Po-210; Pb-210; Radionuclide; Bathymodiolus; Bioaccumulation; Hydrothermal vent.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00030/14172/11864.pdf

A new species of Phyllochaetopterus (Annelida: Chaetopteridae) from deep-sea hydrothermal Ashadze-1 vent field, Mid-Atlantic Ridge: taxonomical description and partial COI DNA sequence
Provedor de dados: 5
Autores: Morineaux, Marie; Nishi, Eijiroh; Ormos, Andrea; Mouchel, Olivier.
Phyllochaetopterus polus, a new species of the polychaete family Chaetopteridae is described. Specimens were collected at the Ashadze-1 vent field (Mid-Atlantic Ridge), from 4100-4200 m depth. P polus is the first chaetopterid reported from the Atlantic hydrothermal vents. Three chaetopterid species have been recorded from deep-sea hydrothermal vents belonging to two genera, Spiochaetopterus and Phyllochaetopterus. P polus sp. nov. is a medium-sized chaetopterid, characterized by 9 chaetigers in region A and 2 in region B; region C is usually incomplete in the specimens examined, but has at least 40-70 chaetigers. This polychaete has one pair of modified chaetae in chaetiger 4 with a pear-shaped obliquely truncated head, triangular uncini and a branched...
Tipo: Text
Palavras-chave: Polychaeta; Hydrothermal vent; Mid-Atlantic Ridge; Taxonomy; New species; COI.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00013/12439/9250.pdf

Speciation of dissolved copper within an active hydrothermal edifice on the Lucky Strike vent field (MAR, 37 degrees N)
Provedor de dados: 5
Autores: Sarradin, Pierre-marie; Waeles, M; Bernagout, Solene; Le Gall, Christian; Sarrazin, Jozee; Riso, R.
The objective of this study was to deter-mine the concentrations of different fractions of dissolved copper (after filtration at 0.45 mu m) along the cold part of the hydrothermal fluid-seawater mixing zone on the Tour Eiffel edifice (MAR). Dissolved copper was analyzed by stripping chronopotentiometry (SCP) after chromatographic C-18 extraction. Levels of total dissolved copper (0.03 to 5.15 mu M) are much higher than those reported for deep-sea oceanic waters but in accordance with data previously obtained in this area. Speciation measurements show that the hydrophobic organic fraction (C18Cu) is very low (2 +/- 1%). Dissolved copper is present mainly as inorganic and hydrophilic organic complexes (nonC(18)CU). The distribution of copper along the pH...
Tipo: Text
Palavras-chave: Mid Atlantic Ridge; Hydrothermal vent; Speciation; Dissolved copper.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-5301.pdf

Dispersion of deep-sea hydrothermal vent effluents and larvae by submesoscale and tidal currents
Provedor de dados: 5
Autores: Vic, Clement; Gula, Jonathan; Roullet, Guillaume; Pradillon, Florence.
Deep-sea hydrothermal vents provide sources of geochemical materials that impact the global ocean heat and chemical budgets, and support complex biological communities. Vent effluents and larvae are dispersed and transported long distances by deep ocean currents, but these currents are largely undersampled and little is known about their variability. Submesoscale (0.1–10 km) currents are known to play an important role for the dispersion of biogeochemical materials in the ocean surface layer, but their impact for the dispersion in the deep ocean is unknown. Here, we use a series of nested regional oceanic numerical simulations with increasing resolution (from δx=6km to δx=0.75km) to investigate the structure and variability of highly-resolved deep currents...
Tipo: Text
Palavras-chave: Submesoscales; Tides; Hydrothermal vent; Lagrangian dispersion; Lucky Strike; Mid-Atlantic Ridge; Connectivity; Bathymodiolus.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00419/53001/53949.pdf

A new genus and species of alvinocaridid shrimp (Crustacea : Decapoda : Caridea) from hydrothermal vents on the North Fiji and Lau Basins, south-western Pacific
Provedor de dados: 5
Autores: Komai, Tomoyuki; Segonzac, Michel.
Nautilocaris saintlaurentae gen. nov, sp. nov, is described and illustrated from hydrothermal vents in the North Fiji Basin and Lau Basin in the south-western Pacific. This new taxon is assigned to the Alvinocarididae. It has a well-developed, dorsally dentate rostrum, carapace with pterygostomian spine present, eye broadly fused mesially, epipod-setobranch complex present above pereopods, and appendix internae on second to fourth pleopods greatly reduced. This combination of characters places it in an intermediate position between a group of species in the genus Alvinocaris with well developed, dorsally, dentate rostrum, carapace with pterygostomian spine present, eyes narrowly fused mesially, epipod-setobranch complex absent and well-developed appendices...
Tipo: Text
Palavras-chave: Pacifique; Hydrothermal vent; Alvinocarididae; Taxinomy; Anatomy.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-430.pdf

Occurrence of Deferribacterales and Entomoplasmatales in the deep-sea Alvinocarid shrimp Rimicaris exoculata gut
Provedor de dados: 5
Autores: Zbinden, Magali; Cambon-bonavita, Marie-anne.
The phylogenetic diversity of the gut microbial population of the hydrothermal shrimp Rimicaris exoculata was determined. The presence of micro-organisms in the hindgut of the shrimp was determined, and their morphology illustrated for the first time by transmission electron microscopy. DNA was extracted from the fore-, mid- and hindgut of shrimps collected at the Rainbow site, at the Mid-Atlantic Ridge, and the sequences of the small-subunit rRNA (16S rDNA) were analyzed. Seven different bacterial phylotypes were identified from the 90 clones screened. The sequences were affiliated to three major groups: epsilon-Proteobacteria (48,8%), Entomoplasmatales (23.3%) and representatives of the new phylum Deferribacteres (26.6%). These results show that the...
Tipo: Text
Palavras-chave: Metal bioremediation; Indigenous gut microllora; Genetic diversity; Shrimp; Hydrothermal vent.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/publication-778.pdf

A hybrid zone between Bathymodiolus mussel lineages from eastern Pacific hydrothermal vents
Provedor de dados: 5
Autores: Johnson, Shannon B.; Won, Yong-jin; Harvey, Julio B. J.; Vrijenhoek, Robert C.
Background: The inhabitants of deep-sea hydrothermal vents occupy ephemeral island-like habitats distributed sporadically along tectonic spreading-centers, back-arc basins, and volcanically active seamounts. The majority of vent taxa undergo a pelagic larval phase, and thus varying degrees of geographical subdivision, ranging from no impedance of dispersal to complete isolation, often exist among taxa that span common geomorphological boundaries. Two lineages of Bathymodiolus mussels segregate on either side of the Easter Microplate, a boundary that separates the East Pacific Rise from spreading centers connected to the Pacific-Antarctic Ridge.  Results: A recent sample from the northwest flank of the Easter Microplate contained an admixture of northern...
Tipo: Text
Palavras-chave: Bathymodiolus antarcticus n. sp; Hybridization; Recombination; Linkage disequilibrium; Deep-sea; Hydrothermal vent; Bathymodiolus thermophilus.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00185/29626/28000.pdf

Thermophilic lifestyle for an uncultured archaeon from hydrothermal vents: Evidence from environmental genomics
Provedor de dados: 5
Autores: Moussard, Helene; Henneke, Ghislaine; Moreira, David; Jouffe, V; Lopez Garcia, Purificacion; Jeanthon, Christian.
We present a comparative analysis of two genome fragments isolated from a diverse and widely distributed group of uncultured euryarchaea from deep-sea hydrothermal vents. The optimal activity and thermostability of a DNA polymerase predicted in one fragment were close to that of the thermophilic archaeon Thermoplasma acidophilum, providing evidence for a thermophilic way of life of this group of uncultured archaea.
Tipo: Text
Palavras-chave: Hydrothermal vent; Thermoplasma acidophilum; Thermophilic archaeon; Genome fragment; Euryarchaeae.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1238.pdf

Sister-species of eastern Pacific hydrothermal vent worms (Ampharetidae, Alvinellidae, Vestimentifera) provide new mitochondrial COI clock calibration
Provedor de dados: 5
Autores: Chevaldonne, Pierre; Jollivet, Didier; Desbruyeres, Daniel; Lutz, Richard; Vrijenhoek, Robert.
Introduction : The evolutionary age of some of the hydrothermal vent taxa have recently become a highly debated issue. Vestimentiferan worms (= siboglinid polychaetes) in particular, have been claimed to be as old as 430 million years based on the occurrence of fossilized tubes resembling those of currently known Vestimentifera (Little et al., 1997), while other authors, based on molecular data, have claimed they must be younger than 100 million years old (Black et al, 1997; Halanych et al., 1998). One explanation for this apparent discrepancy might be that tubes, such as those found in the Silurian fossil vent communities, did not belong to vestimentiferans, but rather to other tube-dwelling polychaetes. However, it is also possible that the choice of the...
Tipo: Text
Palavras-chave: Allopatric speciation; Polychaetes; Polychaetes; Hydrothermal vent.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-895.pdf

Tubeworm-associated permanent meiobenthic communities from two chemically different hydrothermal vent sites on the East Pacific Rise
Provedor de dados: 5
Autores: 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 (&lt;61 ind. 10 cm(-2)) and was higher at Tica (20 to 976 ind. 10 cm(-2)) than at Riftia Field (&lt; 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

Mixotrophy in the deep sea: a dual endosymbiotic hydrothermal mytilid assimilates dissolved and particulate organic matter
Provedor de dados: 5
Autores: Riou, Virginie; Colaco, Ana; Bouillon, Steven; Khripounoff, Alexis; Dando, Paul; Mangion, Perrine; Chevalier, Emilie; Korntheuer, Michael; Santos, Raphael; Dehairs, Frank.
Bathymodiolus azoricus mussels thrive 840 to 2300 m deep at hydrothermal vents of the Azores Triple Junction on the Mid-Atlantic Ridge. Although previous studies have suggested a mixotrophic regime for this species, no analysis has yet yielded direct evidence for the assimilation of particulate material. In the present study, tracer experiments in aquaria with C-13- and N-15-labelled amino acids and marine cyanobacteria demonstrate for the first time the incorporation of dissolved and particulate organic matter in soft tissues of vent mussel. The observation of phytoplanktonic tests in wild mussel stomachs highlights the occurrence of in situ ingestion of sea-surface-derived material. Particulate organic carbon fluxes in sediment traps moored away from...
Tipo: Text
Palavras-chave: Bathymodiolus azoricus; Particulate and dissolved material; Nitrogen and carbon assimilation; Deep sea; Hydrothermal vent; Mussel.
Ano: 2010
URL: https://archimer.ifremer.fr/doc/00005/11589/8230.pdf

Implications of cross-axis flow for larval dispersal along mid-ocean ridges
Provedor de dados: 5
Autores: Mullineaux, Lauren; Speer, Kevin; Thurnherr, Andreas; Maltrud, Matthew; Vangriesheim, Annick.
Introduction : Dispersal processes play an important role in the structure and dynamics of many terrestrial and marine communities, and they are especially critical in deep-sea hydrothermal vent ecosystems. These systems are patchy and transient, and most of the species inhabiting them cannot survive elsewhere, so successful dispersal (usually via a larval stage) is essential for maintaining viable populations and species ranges. To understand the mechanisms of larval dispersal, we need to know larval life spans and the transport dynamics of deep-water flows near vent habitats. When these values are measured for a species in a given region, a maximum dispersal distance can be calculated and compared to the geographic spacing between vent fields in that...
Tipo: Text
Palavras-chave: Numerical models; Dipersal potential; Larvae; Flow regime; Hydrothermal vent; Deep sea ecosystems.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-898.pdf

sFDvent: A global trait database for deep‐sea hydrothermal‐vent fauna
Provedor de dados: 5
Autores: Chapman, Abbie S. A.; Beaulieu, Stace E.; Colaço, Ana; Gebruk, Andrey V.; Hilario, Ana; Kihara, Terue C.; Ramirez‐llodra, Eva; Sarrazin, Jozee; Tunnicliffe, Verena; Amon, Diva J.; Baker, Maria C.; Boschen‐rose, Rachel E.; Chen, Chong; Cooper, Isabelle J.; Copley, Jonathan T.; Corbari, Laure; Cordes, Erik E.; Cuvelier, Daphne; Duperron, Sebastien; Du Preez, Cherisse; Gollner, Sabine; Horton, Tammy; Hourdez, Stéphane; Krylova, Elena M.; Linse, Katrin; Lokabharathi, P. A.; Marsh, Leigh; Matabos, Marjolaine; Mills, Susan Wier; Mullineaux, Lauren S.; Rapp, Hans Tore; Reid, William D. K.; Rybakova (goroslavskaya), Elena; A. Thomas, Tresa Remya; Southgate, Samuel James; Stöhr, Sabine; Turner, Phillip J.; Watanabe, Hiromi Kayama; Yasuhara, Moriaki; Bates, Amanda E.; Padolfi, John.
Motivation Traits are increasingly being used to quantify global biodiversity patterns, with trait databases growing in size and number, across diverse taxa. Despite growing interest in a trait-based approach to the biodiversity of the deep sea, where the impacts of human activities (including seabed mining) accelerate, there is no single repository for species traits for deep-sea chemosynthesis-based ecosystems, including hydrothermal vents. Using an international, collaborative approach, we have compiled the first global-scale trait database for deep-sea hydrothermal-vent fauna - sFDvent (sDiv-funded trait database for the Functional Diversity of vents). We formed a funded working group to select traits appropriate to: (a) capture the performance of vent...
Tipo: Text
Palavras-chave: Biodiversity; Collaboration; Conservation; Cross-ecosystem; Database; Deep sea; Functional trait; Global-scale; Hydrothermal vent; SFDvent.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00509/62033/66160.pdf

Heat-shock response and temperature resistance in the deep-sea vent shrimp Rimicaris exoculata
Provedor de dados: 5
Autores: Ravaux, Juliette; Gaill, Françoise; Le Bris, Nadine; Sarradin, Pierre-marie; Jollivet, Didier; Shillito, Bruce.
The shrimp Rimicaris exoculata swarms around hydrothermal black smoker chimneys at most vent sites along the Mid-Atlantic Ridge. This species maintains close proximity to the hydrothermal fluid, where temperatures can reach 350degreesC and steep thermal and chemical gradients are expected. We performed in vivo experiments in pressurized aquaria to determine the upper thermal limit [critical thermal maximum (CTmax)] of R. exoculata and to investigate some characteristics of the shrimp stress response to heat exposure. These experiments showed that the shrimp does not tolerate sustained exposure to temperatures in the 33-37degreesC range (CTmax). A heat-inducible stress protein belonging to the hsp70 family was identified in R. exoculata, and its synthesis...
Tipo: Text
Palavras-chave: Heat shock; Shrimp; Rimicaris exoculata; Chaperone; IPOCAMP; Caridae; Crustacea; Thermal stress; Hydrothermal vent.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/publication-417.pdf

Long-Term In Situ Survey of Reactive Iron Concentrations at the EMSO-Azores Observatory
Provedor de dados: 5
Autores: 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

Benthic copepod communities associated with tubeworm and mussel aggregations on the East Pacific Rise
Provedor de dados: 5
Autores: Gollner, S; Zekely, J; Van Dover, C; Govenar, B; Le Bris, Nadine; Nemeschkal, H; Bright, M.
Variability in the structure of the meiobenthic copepod communities was studied among three vent sites on the East Pacific Rise. One of the sites was dominated by the mussel Bathymodiolus thermophilus, and the other two of the sites were dominated by the tubeworm Riftia pachyptila. In addition to the differences in the dominant megafauna, the maximum temperatures were much lower at the mussel-dominated sites, and the temperature to sulfide ratio was different between the tubeworm-dominated sites. A total of 22 vent endemic siphonostomatoid copepod species and 5 harpacticoid copepod species were identified among the three sites. Copepod abundance was low at all sites (&lt; 1 - 31 ind. 10 cm(-2)). Species richness ranged from 6 - 14, Shannon-Wiener diversity...
Tipo: Text
Palavras-chave: Community structure; East Pacific Rise; Riftia pachyptila; Bathymodiolus thermophilus; Hydrothermal vent; Meiobenthic copepods.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-3611.pdf

Respiration of bivalves from three different deep-sea areas: cold seeps, hydrothermal vents and organic carbon-rich sediments
Provedor de dados: 5
Autores: 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

Changes of gill and hemocyte-related bio-indicators during long term maintenance of the vent mussel Bathymodiolus azoricus held in aquaria at atmospheric pressure
Provedor de dados: 5
Autores: 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

Description, distribution and microhabitats of a new species of Tisbe (Copepoda: Harpacticoida: Tisbidae) from a deep-sea hydrothermal vent field at the Mid-Atlantic Ridge (37 degrees N, Lucky Strike)
Provedor de dados: 5
Autores: Ivanenko, Viatcheslav; Ferrari, Frank D.; Defaye, Danielle; Sarradin, Pierre-marie; Sarrazin, Jozee.
A new species, Tisbe dahmsi sp. nov. (Crustacea, Copepoda: Harpacticoida: Tisbidae) is described from the Eiffel Tower edifice located in the Lucky Strike vent field (37 degrees N) (Mid-Atlantic Ridge MAR, 1698 m). The samples were collected in colonization experiments (SMAC arrays) that were deployed in 1997 during the MARVEL cruise and recovered in 1998 during the PICO cruise. Other specimens were collected during the MoMARETO cruise during which a physico-chemical characterization of copepod microhabitats was done. The new species belongs to the T. gracilis group based on similarities of the spine-like inner seta on the proximal endopodal segment of the male second swimming leg, which is terminally bifurcate. Re-examination of the closest relative and...
Tipo: Text
Palavras-chave: Copepoda; Harpacticoida; Tisbidae; Deep-sea; Hydrothermal vent; Mid-Atlantic Ridge; Systematics; Ecology; Microhabitat; In situ experiments; Physico-chemical factors.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00029/14066/11306.pdf

Distribution and spatial variation of hydrothermal faunal assemblages at Lucky Strike (Mid-Atlantic Ridge) revealed by high-resolution video image analysis
Provedor de dados: 5
Autores: Cuvelier, Daphne; Sarrazin, Jozee; Colaco, Ana; Copley, Jon; Desbruyeres, Daniel; Glover, Adrian G.; Tyler, Paul; Santos, Ricardo Serrao.
Whilst the fauna inhabiting hydrothermal vent structures in the Atlantic Ocean is reasonably well known, less is understood about the spatial distributions of the fauna in relation to abiotic and biotic factors. In this study, a major active hydrothermal edifice (Eiffel Tower, at 1690 m depth) on the Lucky Strike vent field (Mid-Atlantic Ridge (MAR)) was investigated. Video transects were carried out by ROV Victor 6000 and complete image coverage was acquired. Four distinct assemblages, ranging from dense larger-sized Bathymodiolus mussel beds to smaller-sized mussel clumps and alvinocaridid shrimps, and two types of substrata were defined based on high definition photographs and video imagery. To evaluate spatial variation, faunal distribution was mapped...
Tipo: Text
Palavras-chave: Vent ecology; Mid Atlantic Ridge; Hydrothermal vent; Lucky Strike; Video analysis; Faunal assemblages; Spatial distribution; Community structure.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-7328.pdf

Enargite-luzonite hydrothermal vents in Manus Back-Arc Basin: submarine analogues of high-sulfidation epithermal mineralization
Provedor de dados: 5
Autores: Dekov, Vesselin M.; Rouxel, Olivier; Kouzmanov, Kalin; Bindi, Luca; Asael, Dan; Fouquet, Yves; Etoubleau, Joel; Burgaud, Gaetan; Walle, Markus.
Active and inactive hydrothermal chimneys composed almost entirely of enargite and luzonite, rare minerals in seafloor hydrothermal deposits, were found at the summits of two submarine volcanoes, North Su and Kaia Natai, in the Manus Back-Arc Basin. Detailed mineralogical and geochemical studies revealed that most probably these deposits precipitated at T = 200°–330 °C and high fS2. The negative δ34S values (− 8.58 to − 3.70‰) of the enargite-luzonite are best explained by disproportionation reactions of magmatic SO2 and suggest that the high fS2 is likely provided by direct magmatic input of SO2 into the hydrothermal system. Fractionation of Cu stable isotopes during the precipitation of enargite-luzonite (δ65Cu ranges from − 0.20 to + 0.35‰) is inferred...
Tipo: Text
Palavras-chave: Enargite; Epithermal; Hydrothermal vent; Luzonite; S-Cu isotopes; Seafloor.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00337/44844/44432.pdf

Two New Genera and Species of Ophiuroid (Echinodermata) from Hydrothermal Vents in the East Pacific
Provedor de dados: 5
Autores: 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

Profundibacter amoris gen. nov., sp. nov., a new member of the Roseobacter clade isolated from Loki’s Castle Vent Field on the Arctic Mid-Ocean Ridge.
Provedor de dados: 5
Autores: Le Moine Bauer, Sven; Sjøberg, Andreas Gilje; L'Haridon, Stephane; Stokke, Runar; Roalkvam, Irene; Steen, Ida Helene; Dahle, Håkon.
A bacterial strain, designated BAR1T, was isolated from a microbial mat growing on the surface of a barite chimney at the Loki’s Castle Vent Field, at a depth of 2216 m. Cells of strain BAR1T were rod-shaped, Gram-reaction-negative and grew on marine broth 2216 at 10–37 °C (optimum 27–35 °C), pH 5.5–8.0 (optimum pH 6.5–7.5) and 0.5–5.0 % NaCl (optimum 2 %). The DNA G+C content was 57.38 mol%. The membrane-associated major ubiquinone was Q-10, the fatty acid profile was dominated by C18 : 1ω7c (91 %), and the polar lipids detected were phosphatidylcholine, phosphatidylglycerol, phosphatidylethanolamine, one unidentified aminolipid, one unidentified lipid and one unidentified phospholipid. Phylogenetic analyses based on 16S rRNA gene sequences showed that...
Tipo: Text
Palavras-chave: Roseobacter; Alphaproteobacteria; Piezophilic; Isolate; Deep-sea; Hydrothermal vent.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00482/59323/62117.pdf