![]() | Apport du satellite SPOT à la connaissance des écosystèmes récifaux coralliens. La végétation marine de l'île de Moorea, Polynésie française Auteur(s) : Belsher, T Meinesz, A Payri, C Benmoussa, H Éditeur(s) : Gauthier-Villars Oceanologica Acta (0399-1784) (Gauthier-Villars), 1990 , Vol. 13 , N. 4 , P. 513-524 Droits : info:eu-repo/semantics/openAccess http://archimer.ifremer.fr/doc/00103/21421/18998.pdf http://archimer.ifremer.fr/doc/00103/21421/ | Partager |
![]() | Première exploration in situ de la dorsale médio-Atlantique au sud de la zone de fracture Atlantis (29"06'N-43"1l'W) Auteur(s) : Auzende, Jean-marie Tivey, M Cannat, M Gente, Pascal Henriet, Jean-pierre Juteau, Thierry Karson, J Lagabrielle, Yves Éditeur(s) : Gauthier-villars Résumé : During the Kanaut cruise of the submersible Nautile and its mothership Le-Nadir (15 November-16 December 1992), one dive was devoted to the detailed study of a specific area of the neovolcanic ridge of the MAR around 29-degrees-06'N and 43-degrees-11'W. This study emphasizes the importance of the juxtaposition and the stacking of hundreds of small volcanoes in the construction of a neovolcanic ridge and confirms the general observation made from multibeam and side-scan sonar data. The very large magnetic anomaly associated with these massifs favours an extreme freshness. Lors de la campagne Kanaut (15 novembre-16 décembre 1992) du Nautile et de son navire support Le-Nadir, une plongée a été consacrée B l'étude détaille d'un secteur de la ride néovalcanique de l'axe de la dorsale médio-Atlantique autour de 29"06" et 43"ll'W. Cette étude permet de souligner le rôle prépondérant que jouent les centaines de petits édifices volcaniques dans la construction de la ride néovolcanique, par leur juxtaposition et leur superposition. Ceci confirme et affine les observations faites B partir des données des sondeurs multifaisceaux et les sonars latéraux. La très forte anomalie magnétique associé B ces édifices penche en faveur de leur extrème fraicheur. Comptes Rendus de l'Academie des Sciences Serie II (1251-8069) (Gauthier-villars), 1993-05 , Vol. 316 , N. 10 , P. 1415-1422 Droits : Académie des Sciences http://archimer.ifremer.fr/doc/00183/29475/27887.pdf http://archimer.ifremer.fr/doc/00183/29475/ | Partager |
![]() | Apport à la connaissance de la paléohydrologie de l'Atlantique nord-oriental pendant le Quaternaire terminal Auteur(s) : Alvinerie, J Caralp, M Latouche, C Moyes, J Vigneaux, M Éditeur(s) : Gauthier-Villars Oceanologica Acta (0399-1784) (Gauthier-Villars), 1978 , Vol. 1 , N. 1 , P. 87-98 Droits : info:eu-repo/semantics/openAccess http://archimer.ifremer.fr/doc/00123/23411/21238.pdf http://archimer.ifremer.fr/doc/00123/23411/ | Partager |
![]() | Stratigraphie des escarpements encadrant la baie de Porcupine : résultats préliminaires de la campagne Cyaporc (juillet-août 1986) Auteur(s) : Auzende, Jm Cousin, M Coutelle, A Dobson, M Geoghegan, M Masson, D Rolet, J Vaillant, P Éditeur(s) : Gauthier-Villars Oceanologica Acta (0399-1784) (Gauthier-Villars), 1989-07 , Vol. 12 , N. 3 , P. 117-131 Droits : info:eu-repo/semantics/openAccess http://archimer.ifremer.fr/doc/00106/21742/19315.pdf http://archimer.ifremer.fr/doc/00106/21742/ | Partager |
![]() | Résultats préliminaires sur la distribution des juvéniles de poissons dans un marais maritime du Bassin d'Arcachon Auteur(s) : Labourg, Pj Clus, C Lasserre, G Éditeur(s) : Gauthier-Villars Oceanologica Acta (0399-1784) (Gauthier-Villars), 1985 , Vol. 8 , N. 3 , P. 331-341 Droits : info:eu-repo/semantics/openAccess http://archimer.ifremer.fr/doc/00112/22321/19994.pdf http://archimer.ifremer.fr/doc/00112/22321/ | Partager |
![]() | Chemical evidence for advection of interstitial fluid in the sedimentary series of the barbados accretionary complex (leg-110) Auteur(s) : Blanc, G Boulegue, J Gieskes, Jm Éditeur(s) : Gauthier-Villars Résumé : We report here our findings on the chemistry of methane, manganese and chloride dissolved in the interstitial water of the Barbados accretionary complex. The decollement separating the subduction plate from the accretionary wedge is geochemically characterized by high methane and manganese and low chloride concentrations relative to buried seawater. Sandstone layers occurring below the decollement and the compressive structures recording some of the earliest effects of offscraping are also characterized by similar anomalies. A fluid with the same characteristics is also found six kilometres to the east of the deformation front within the oceanic plate. High manganese concentration and low chlorinity also occur in the pore water of the offscraped sediment packages, but without associated anomalous methane concentrations. These results suggest that: Dewatering processes occur below the decollement in association with thermogenic methane production; Fluid with low chlorinity and high methane concentrations circulates mainly along the decollement, its propagation in the oceanic domain and along the main fracture zones being associated with these detachment surfaces; Diagenetic processes essentially control the dissolved manganese concentration and probably affect the methane content of the interstitial waters; The observations made in this paper illustrate advective processes in the front of an accretionary prism. Oceanologica Acta (0399-1784) (Gauthier-Villars), 1991 , Vol. 14 , N. 1 , P. 33-49 Droits : info:eu-repo/semantics/openAccess http://archimer.ifremer.fr/doc/00101/21262/18873.pdf http://archimer.ifremer.fr/doc/00101/21262/ | Partager Voir aussi BARBADOS ACCRETIONARY COMPLEX INTERSTITIAL WATER CHEMICAL COMPOSITION ADVECTION DIAGENESIS Télécharger |
![]() | Fluctuations d'activites enzymatiques digestives chez les actinies abyssales: Indices d'une nutrition particuliere Auteur(s) : Van-praet, M Éditeur(s) : Gauthier-Villars Résumé : The variations of amylase and of the ratio amylase/chymotrypsin (A/C) in the extracts of sea anemones are considered as correlated with the amount of microalgae and vegetal detritus in their diet. The results given by the lots of sea anemones from different depths did not fluctuate significantly for chymotrypsic activities, but the level of the amylolytic activity and the value of the ratio A/C varied as depth. The value of A/C was high in the extracts of sea anemones trawled from 2,000 m in the Bay of Biscay in June (84 plus or minus 52) and lower in September (36 plus or minus 16). The values measured in the extracts of sea anemones trawled from 5,200 to 4,500 m (off Portugal) in June, or from 4,900 m (in Demerara Plain) in September were remarkably low (21 plus or minus 3 and 15 plus or minus 10). The hypothesis of seasonal variations in the diet of deep-sea actinians was discussed. Oceanologica Acta, Special issue (0399-1784) (Gauthier-Villars), 1983 Droits : info:eu-repo/semantics/openAccess http://archimer.ifremer.fr/doc/00246/35774/34287.pdf http://archimer.ifremer.fr/doc/00246/35774/ | Partager |
![]() | Paléoenvironnements néogènes dans les bassins océaniques ibéro-marocains Relations paléohydrologiques Méditerranée-Atlantique Auteur(s) : Cirac, P Peypouquet, Jp Éditeur(s) : Gauthier-Villars Oceanologica Acta (0399-1784) (Gauthier-Villars), 1983 , Vol. 6 , N. 2 , P. 147-156 Droits : info:eu-repo/semantics/openAccess http://archimer.ifremer.fr/doc/00120/23142/20987.pdf http://archimer.ifremer.fr/doc/00120/23142/ | Partager |
![]() | Introduction et invasion de l'algue tropicale Caulerpa taxifolia en Méditerranée nord-occidentale Auteur(s) : Meinesz, A Hesse, B Éditeur(s) : Gauthier-Villars Résumé : The tropical alga Caulerpa taxifolia (Vahl) C. Agardh has been displayed over the last fifteen years in tropical aquaria at the Oceanographic Museum, Monaco. Its accidental introduction into the natural environment dates from 1984. It developed first in the sea immediately below the museum, and resisted winter temperatures of 11 to 13-degrees-C. Gradually the population spread over all types of substrate, including rock, sand and mud, and over a wide range of depth, 3 to 35 m, on this relatively exposed site. In summer 1990 we became aware of its presence both to the east and to the west of Monaco. To the east, it now occurs on the whole of the eastern side of Cap Martin (3 km from Monaco) and is spreading over the west face. To the west we have observed it 150 km from Monaco near Toulon. In those sites which it colonized three years ago, its coverage now reaches 100 % over extensive areas in depths between 5 and 25 m. Areas supporting stands of Cymodocea nodosa and Posidonia oceanica are covered by fronds of C. taxifolia, which measure up to 45 cm in length. The development characteristics of the species in the Mediterranean, such as population density and frond length, are different from those in its native tropical areas. The rapid spreading of this alga is probably due both to sexual reproduction and to efficient vegetative reproduction. At the rate of spreading observed at present, further rapid extension of its range is to be feared. Moreover, wherever it becomes established, it considerably modifies the vegetal communities in the infralittoral zone. This species, like most of those in the genus Caulerpa, contains the toxin, caulerpenyn, which may play a role against other organisms such as grazers, epiphytes and competitors. This alga will be eaten only by certain animals such as the Mediterranean bream or saupe, Sarpa salpa. The toxin accumulated by fish which eat Caulerpa can render them unsuitable for human consumption, as their ingestion produces symptoms similar to those of Ciguatera poisoning. Never has a species so potentially harmful to the marine population been introduced into the Mediterranean. This biological pollution raises the major international problem of direct discharge of water having passed through aquaria or mariculture installations containing exotic species. As importing exotic marine species becomes technically easier, the lack of regulation risks further similar accidents concerning not only algae, but also metazoa and micro-organisms. Oceanologica Acta (0399-1784) (Gauthier-Villars), 1991 , Vol. 14 , N. 4 , P. 415-426 Droits : info:eu-repo/semantics/openAccess http://archimer.ifremer.fr/doc/00101/21268/18879.pdf http://archimer.ifremer.fr/doc/00101/21268/ | Partager |
![]() | Variabilité des manifestations hydrothermales actuelles le long d'une dorsale ultra rapide. Dorsale Est Pacifique entre 17° et 19° S (campagne NAUDUR). Auteur(s) : Fouquet, Yves Auzende, Jean-marie Ballu, V Batiza, R Bideau, Daniel Cormier, Mh Geistdoerfer, P Lagabrielle, Yves Éditeur(s) : Gauthier-villars Résumé : 69 new hydrothermal sites were discovered during the Naudur diving cruise. Dives were conducted between 17 degrees 5 and 18 degrees 40'5 on four segments showing marked contrast in morphology, volcanic, tectonic and hydrothermal activity. At 17 degrees 10'5, 17 degrees 25'5 and 18 degrees 37'5 the ridge has a dome shaped cross-section and is dominated by very active volcanic activity. Early widespread low temperature (<50 degrees C) diffuse hydrothermal discharge is followed by focused high temperature black smokers. At 18 degrees 15'S tectonic activity is dominant, no recent lava was observed, and only two of the 20 hydrothermal sites are active. At 18 degrees 32'5 recent lava representing a new volcanic episode partly covers the bottom of the graben. Deep hydrothermal convection is reactivated with new black smokers along the graben wall. Also, there is low temperature shimmering water from cooling lava flows. These three segments can be considered as successive volcanic/tectonic episodes typical of a fast spreading ridge. Further, the observations support a new model for the temporal evolution of episodic hydrothermal activity. Hydrothermal convection is unstable and superficial during the volcanic stage (dykes injection). At the beginning of the teaonic stage (graben formation) faults allow deep circulation and hot fluid to reach the surface. As the graben widens hydrothermal activity is less important and may cease. The heat of a new volcanic episode reactivates the deep hot water circulation along the graben faults completing a cycle. 69 nouveaux sites hydrothermaux ont été découverts entre 17'5 et 18'40'5 sur quatre segments présentant des activités volcaniques et tectoniques contrastées. A 17°10'S,17025'S et 18'37'5, la ride forme un dôme et l'activité volcanique est dominante. Les émissions hydrothermales sont d'abord diffuses et de basse température, puis focalisées et de haute température. A 18°15'S la majorité des sites hydrothermaux sont inactifs dans un graben axial dépourvu de laves récentes. A 18'32'5, des laves récentes s'épanchent au fond du graben. Les circuits hydrothermaux réactivés par le nouvel épisode volcanique se traduisent par des diffusions sur les laves récentes et par une reprise des émissions de haute température le long des murs du graben. Ces quatre segments traduisent des épisodes volcanoltectoniques successifs, caractéristiques de I'évolution temporelle des dorsales rapides. Les observations permettent de proposer un nouveau modèle de l'activité hydrothermale. Les circuits hydrothermaux sont diffus, peu structurés, instables et superficiels durant les épisodes volcaniques. Au début des épisodes tectoniques, les failles du graben drainent les fluides chauds en profondeur, puis lorsque le graben s'élargit, l'activité s'interrompt. La reprise de l'activité volcanique réamorce les circulations profondes le long des failles du graben. Comptes Rendus de l'Academie des Sciences Serie II (1251-8069) (Gauthier-villars), 1994-12 , Vol. 319 , N. 11 , P. 1399-1406 Droits : Académie des Sciences http://archimer.ifremer.fr/doc/00183/29455/27889.pdf http://archimer.ifremer.fr/doc/00183/29455/ | Partager Voir aussi Hydrothermalisme Océan Dorsales rapides Min6ralisations sulfurées. HYDROTHERMAL ACTIVITY OCEAN FAST SPREADING RIDGES SULFIDES Télécharger |
![]() | Tropical instability waves in the atlantic-ocean - a contributor to biological processes Auteur(s) : Morliere, A Lebouteiller, A Citeau, J Éditeur(s) : Gauthier-Villars Résumé : Long tropical instability waves are described at around 3-4 degrees N based on results of a simulation performed with a general circulation model for the Atlantic Ocean. This description is in agreement with earlier observations of organized undulations of the summer thermal front associated with anti-cyclonic eddies propagating westward at 30-40 km/day along 3-4 degrees N from 10 to 40 degrees W through the Atlantic basin. However, the simulation indicated the presence of long waves in early boreal winter. In this respect, satellite observations during short cold events in winter show thermal front undulations similar to those associated with long wave propagations. The simulation clearly demonstrated large vertical movements between the surface and a depth of 70 m, associated with anti-cyclonic eddies at around 3 degrees N. These vertical movements could commonly reach the thermocline in the central part of the Atlantic basin (10-20 degrees W). In this region, long instability waves could subsequently affect biological production by ''eddy pumping''. During the PIRAL cruise at 4 degrees N-20 degrees W in June 1986, remarkably high chlorophyll concentrations (the highest values in our data bank for the equatorial Atlantic and typical of a very productive zone) were associated with currents similar to those of an anticyclonic eddy and characterized by a surface temperature distribution typical of the long instability wave pattern. These high chlorophyll concentrations may have resulted from ''eddy pumping'' and/or strong meridian advection since each of these mechanisms is associated with long instability waves. Oceanologica Acta (0399-1784) (Gauthier-Villars), 1994 , Vol. 17 , N. 6 , P. 585-596 Droits : info:eu-repo/semantics/openAccess http://archimer.ifremer.fr/doc/00099/21034/18660.pdf http://archimer.ifremer.fr/doc/00099/21034/ | Partager |
![]() | La ciguatera dans l'île de Saint-Barthélémy : aspects épidémiologiques, toxicologiques et préventifs Auteur(s) : Vernoux, Jp Éditeur(s) : Gauthier-Villars Oceanologica Acta (0399-1784) (Gauthier-Villars), 1988-01 , Vol. 11 , N. 1 , P. 37-46 Droits : info:eu-repo/semantics/openAccess http://archimer.ifremer.fr/doc/00108/21888/19479.pdf http://archimer.ifremer.fr/doc/00108/21888/ | Partager |
![]() | Distribution et évolution saisonnière du cuivre dissous dans un écosystème estuarien macrotidal d'Europe occidentale (estuaire de l'Aule, France) Auteur(s) : Bordin, G Éditeur(s) : Gauthier-Villars Résumé : The seasonal variations of total dissolved copper were surveyed during one year (1983/1984) in the Aulne estuary (Western Brittany, France), an ecosystem with a high rate of water renewal. Copper in filtered water samples (after and without acidification) was determined after preconcentration on Chelex 100, and the eluates were analyzed by graphite furnace atomic absorption spectroscopy. The concentrations of free and complexed copper were then plotted versus chlorosity. Globally, the total dissolved copper concentrations tend to decrease with salinity. The role of physicochemical parameters such as pH and suspended matter (adsorption-desorption mechanisms) on dissolved copper content is shown to be significant. With a variable intensity, desorption (release) takes place in summer and in autumn, while adsorption is observed at very low chlorosity in winter. The dissolved copper concentrations in the Aulne estuary (0.26 to 2.52-mu-g.l-1, with the highest values in autumn) are similar to most estuarine copper values. The proportion of complexed species ranges from 4 to 69% (average of 27%). Les variations saisonnières des concentrations en cuivre dissous dans l'estuaire de l'Aulne (Bretagne occidentale) ont été mesurées au cours d'un cycle annuel (1983/1984). Les concentrations en cuivre libre et celles en cuivre complexé ont été suivies séparément en fonction de la chlorosité, un paramètre conservatif. Les profils obtenus pour le cuivre total dissous montrent généralement une décroissance des teneurs en métal des eaux douces aux eaux marines, tout en restant supérieures à celles de la droite théorique de mélange. On montre le rôle fondamental de la variation du pH concomitante de celle de la matière en suspension (mécanisme d'adsorption-désorption) dans l'évolution des teneurs en cuivre dissous. Ce processus agit plus ou moins intensément dans le sens de la désorption (été, automne) ou de l'adsorption (hiver aux faibles chlorosités). Dans l'ensemble, les teneurs en cuivre total dissous (de 0,26 à 2,52 J.lg.l- 1 , les valeurs automnales étant les plus élevées) sont comparables à celles de nombreux autres écosystèmes estuariens, avec un taux de complexation compris entre 4 et 69% (moyenne de 27% ). Oceanologica Acta (0399-1784) (Gauthier-Villars), 1991 , Vol. 14 , N. 5 , P. 445-457 Droits : Gauthier-Villars http://archimer.ifremer.fr/doc/00103/21377/18977.pdf http://archimer.ifremer.fr/doc/00103/21377/43066.pdf http://archimer.ifremer.fr/doc/00103/21377/ | Partager |
![]() | Structure and evolution of the Mazagan (El Jadida) plateau and escarpment off central Morocco Auteur(s) : Ruellan, E Auzende, J M Dostmann, H Éditeur(s) : Gauthier-Villars Résumé : The Mazagan (El Jadida) plateau and escarpment constitute the seaward extension of the Moroccan Meseta. Sedimentary sequence began at least as long ago as the Triassic. A very dense seismic reflection survey (32 profiles at 1 n. mile spacing) and information from 18 Cyana dives on the Mazagan the construction of isochrom map of the depth of the acoustic basement constituted either by jurassic platform carbonates or by Paleozoic granodiorite to Precambrian (?) crystalline basement, and a detailed structural map. The carbonate platform is structured in a succession of tilted blocks from the plateau to the foot of the escarpment. During early Cretaceous times, an important phase of vertical structuration is marked by the denudation of the escarpment. Transgressive sediments of late Cretaceous age cover unconformably the carbonate platform along the outer edge of the Mazagan Plateau. Deformation observed within the sedimentary cover suggests vertical tectonism from late Cretaceous up to the Present. Oceanologica Acta, Special issue (0399-1784) (Gauthier-Villars), 1985 Droits : info:eu-repo/semantics/openAccess http://archimer.ifremer.fr/doc/00247/35832/34342.pdf http://archimer.ifremer.fr/doc/00247/35832/ | Partager |
![]() | Les apports organiques et leur transformation en milieu abyssal à l'interface eau-sédiment dans l'Océan Atlantique tropical Auteur(s) : Khripounoff, Alexis Rowe, Gilbert T Éditeur(s) : Gauthier-Villars Résumé : Five particle traps were deployed at depths of 4 400 to 4 900 rn at two stations on the Demerara abyssal plain and one station on the Cape Verde abyssal plain (tropical Atlantic). At the same time, an intensive sampling of superficial sediments was carried out using a 0,25 m2 box corer. The total particle flux varied from 372 to 87,7 mg dry weightfm2/day. The average concentration of organic carbon was 40 mg/g of material collected. ln the surface sediment this was only 4 mg/g. A direct relationship existed between the intensity of the flux of organic matter and the richness of the organic matter of the deposited sediment. According to our calculations, more than 90% of the organic matter arriving at the bottom is consumed by the abyssal benthos and only 1% is lost to permanent sediment deposits. For 100 calories consumed by the benthos, 99 are utilized by the infauna and flora, 0, 7 by the holothurian egafauna and 0,3 by near-bottom fisches. The biochemical composition of the particles is characterized at ali stations by a predominance of "humic" material in the total organic matter (more than 55%). The part of the molecules unaltered form living material varied from on station to another: for the most oceanic station the protein dominated, composing 20% of the total energy. At the station onder the influence of the continent the lipid fraction grew and was almost equal to that of the protein. ln this case, the carbohydrate fraction was very weak (7% of the organic matter). Finally the preference of the animais which feed on the particles is principally for the most energetic (lipid) and the most easily hydrolysable (labile protein) molecules: the other molecules, such as the humic matter, are less preferred, although they still contribute to about half of the energy consumed by the abyssal benthic animais. Cinq pièges à particules ont été déployés à des profondeurs comprises entre 4400 et 4 900 rn sur deux stations dans la plaine abyssale de Demerara et une station dans la plaine abyssale du Cap Vert (Atlantique tropical). Dans le même temps, un échantillonnage intensif du sédiment superficiel a été réalisé à l'aide d'un carottier de 0,25 m2 d'ouverture. Le flux particulaire total mesuré varie de 372 mg de matière sèche/m2/jour à 87,7 mg/m2/g de matériel récolté. Dans les sédiments superficiels, elle n'est plus que d'environ 4 mg/g. Il existe une relation directe entre l'intensité du flux organique et la richesse en composés organiques du sédiment. D'après nos estimations, plus de 90% du matériel organique arrivant sur le fond sont consommés par les organismes benthiques abyssaux et seulement 1% est perdu dans la sédimentation permanente. Pour 100 calories consommées par le benthos, 99 le sont par la petite faune et la flore vivant dans le sédiment, 0, 7 calories sont utilisées par les holothuries (mégafaune) et 0,3 calories par les poissons. La composition biochimique des particules se caractérise, à toutes les stations, par la prédominance des composés organiques transformées néobiogéniques ( « humus ») dans la matière organique totale (plus de 55%). La part des molécules de la matière vivante varie d'une station à l'autre: à la station la plus océanique, les protéines dominent et composent 200/o de l'énergie totale des apports. Dans la station plus soumise aux influences continentales, la concentration en lipides augmente et peut égaler celle des protéines. Dans ce cas, le taux de glucides des particules est très faible (7% des apports organiques). Enfin, les préférences nutritionnelles des animaux qui s'alimentent sur ces particules se portent principalement sur les molécules les plus énergétiques (lipides) et les plus facilement hydrolysables (protéines labiles) : les autres molécules, comme les composés néobiogéniques sont moins recherchés bien qu'ils contribuent pour moitié à l'énergie consommée par les animaux benthiques abyssaux Oceanologica Acta (0399-1784) (Gauthier-Villars), 1985 , Vol. 8 , N. 3 , P. 293-301 Droits : Gauthier-Villars http://archimer.ifremer.fr/doc/00112/22318/19991.pdf http://archimer.ifremer.fr/doc/00112/22318/ | Partager |
![]() | Biomass and production of two Halimeda species in the southwest new caledonian lagoon Auteur(s) : Garrigue, C Éditeur(s) : Gauthier-Villars Résumé : Two algal communities on unconsolidated sand, dominated by two Caulerpa populations, were studied in the southwestern New Caledonian lagoon. Biomass, growth rates and production were measured at two stations over one year. Biomass and growth rate of Halimeda were estimated monthly by counting the number of new and lost segments on tagged plants and by weighing them. Production was assessed monthly by comparing two successive measurements. The average rates measured were 0.60 s f-1 d-1 (segment frond-1 day-1 ) for Halimeda incrassata and 0. 15 s f-1 d-1 for H. discoidea. Production in terms of organic carbon amounted to 3.79 g m-2 y-1 for H. incrassata and 3.37 g m-2 y-1 for H. discoidea. The production of H. discoidea population is subject to seasonal variations. Oceanologica Acta (0399-1784) (Gauthier-Villars), 1991 , Vol. 14 , N. 6 , P. 581-588 Droits : info:eu-repo/semantics/openAccess http://archimer.ifremer.fr/doc/00102/21277/18886.pdf http://archimer.ifremer.fr/doc/00102/21277/ | Partager |
![]() | Submersible observations of the invertebrate fauna on the continental-slope southwest of ireland (ne atlantic-ocean) Auteur(s) : Tyler, Pa Zibrowius, H Éditeur(s) : Gauthier-Villars Résumé : Relatively little is known of the fauna found on rock substrates in the deep ocean. As a result of the Franco-British deep diving cruise Cyaporc in 1986 using the submersible Cyana we present observations of a highly diverse sponge, cnidarian and echinoderm fauna occurring between 1 800 and 3 000 m on the steep slopes to the west of the Porcupine Bank and Goban Spur. This fauna is dominated. by suspension feeders and appears to show a vertical zonation corresponding to water mass structure. The highest biomass and variety of echinoderms are found between 2 100 and 2 600 m bathed in northward flowing North East Atlantic Deep Water. We present also additional observations of species known from previous sampling programmes but rarely photographed in their natural environment. Oceanologica Acta (0399-1784) (Gauthier-Villars), 1992 , Vol. 15 , N. 2 , P. 211-226 Droits : info:eu-repo/semantics/openAccess http://archimer.ifremer.fr/doc/00100/21154/18773.pdf http://archimer.ifremer.fr/doc/00100/21154/ | Partager |
![]() | Systèmes d'informations géocodées et télédétection à haute résolution. Exemple d'application aux côtes jordaniennes Auteur(s) : Courboules, J Maniere, R Bouchon, C Éditeur(s) : Gauthier-Villars Oceanologica Acta (0399-1784) (Gauthier-Villars), 1988-10 , Vol. 11 , N. 4 , P. 337-351 Droits : info:eu-repo/semantics/openAccess http://archimer.ifremer.fr/doc/00106/21763/19337.pdf http://archimer.ifremer.fr/doc/00106/21763/ | Partager |
![]() | Le baliste des côtes africaines, (Balistes carolinensis). Biologie, prolifération et possibilités d'exploitation Auteur(s) : Caveriviere, A Éditeur(s) : Gauthier-Villars Oceanologica Acta (0399-1784) (Gauthier-Villars), 1982 , Vol. 5 , N. 4 , P. 453-459 Droits : info:eu-repo/semantics/openAccess http://archimer.ifremer.fr/doc/00121/23197/21042.pdf http://archimer.ifremer.fr/doc/00121/23197/ | Partager |
![]() | La sédimentation au quaternaire terminal sur la plate-forme continentale de la Guyane française Auteur(s) : Pujos, M Odin, Gs Éditeur(s) : Gauthier-Villars Oceanologica Acta (0399-1784) (Gauthier-Villars), 1986-10 , Vol. 9 , N. 4 , P. 363-382 Droits : info:eu-repo/semantics/openAccess http://archimer.ifremer.fr/doc/00110/22089/19730.pdf http://archimer.ifremer.fr/doc/00110/22089/ | Partager |